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ARCHIVED FORUM -- April 2007 to March 2012
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This is the first Archived Forum which was active between 17th April 2007 and 1st March February 2012

 

Latest post 10-10-2010 3:38 AM by Dillen. 75 replies.
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  • 08-01-2010 9:09 AM In reply to

    • Dillen
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    • Copenhagen / Denmark
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    Re: Master 39K

    And the cardboard box can be opened.
    The original capacitors take up most of the room in the carton. The excess volume
    at the bottom of the carton is usually filled with wax, pitch and/or some tar-like substance.
    In this one it looks and feels like wax. It is a messy job but I was happy to see
    that I didn't have to empty the whole carton. The lower end, where I opened the carton,
    under the paper rolls that form the original capacitors, the room that is filled
    with wax will easily accomodate the two new high-voltage capacitors.
    This will be fairly easy and well worth the time.

    Martin

  • 08-01-2010 9:11 AM In reply to

    • Dillen
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    Re: Master 39K

    The three leads were cut as long as possible, cleaned off wax etc. and put aside.
    The lower "compartment" was also cleaned as good as possible and a piece of thin carton
    was prepared to use as double insulation between the old paper roll capacitors still in
    the carton (you can see the round shape of the paper/foil rolls) and the new
    electrolytic ones to come.

    The new capacitors are 22uF 400V 105degC types so will be perfect for this task.

    Martin

  • 08-01-2010 9:12 AM In reply to

    • Dillen
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    Re: Master 39K

    A new black lead was prepared. I used a silicone covered type that is a closer visual
    match to the old lead than any PVC type.
    Not a lot of it will be visible anyways, but even that will look right.
    The leads were soldered to the new capacitors and shrink tubing fitted for insulation.
    They fit nicely with a snug squeeze as the carton is closed so will be held nicely
    in place and will never rattle around. A blob of hot melt glue will hold the new
    capacitors in place in any case.

    Martin

  • 08-01-2010 9:13 AM In reply to

    • Dillen
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    Re: Master 39K

    In place.

    Martin

  • 08-01-2010 9:15 AM In reply to

    • Dillen
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    Re: Master 39K

    New, safe components in perfect vintage look. I couldn't have wished for a better result.
    Now ready to mount back on the chassis and noone will be able to tell the difference.

    Martin

  • 08-06-2010 6:57 AM In reply to

    • Dillen
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    Re: Master 39K

    It's always a difficult task to settle for a policy when repairing/restoring a set like this.
    Previous repairers simply replaced the original defective components with what they had
    available. They put in what was modern components at the time and never thought much about it.

    I just rebuilt the large filter/reservoir capacitor box, striving for a strict keeping
    of the original appearance and I'm now in a situation where a good handful of capacitors
    need to be replaced under the chassis and the inevitable dillemas surface ...
    - Who will ever look in there ?
    - Is it important to keep an original appearance inside the set at all ?
    - Should I try to make the new caps look like the old ones did ?
    - Would it merely confuse a future repairer ?
    - Should I follow previous repairers footsteps and simply take out the old ones and fit modern caps ?
    - The set is now 70+ years old but should that be reason for a sudden change of repair policy ?
    - Should I go for a sensible compromise and keep the (through the rear cover) visible parts on
    top of the chassis original and allow modern components in below decks and eventually
    store the old components in a bag or similar inside the set ?
    - Will it ruin the sets history or will it just add to it ?

    Martin

  • 08-06-2010 1:11 PM In reply to

    • Rich
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    Re: Master 39K

    Absolutely fascinating and a wonderful read.

    Thanks, Martin.

    Current primary listening:  SMMC20EN -> BG4002 -> BM4000 -> Beovox M70

     

  • 08-06-2010 3:10 PM In reply to

    • Medogsfat
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    Re: Master 39K

    Dillen:

    It's always a difficult task to settle for a policy when repairing/restoring a set like this.
    Previous repairers simply replaced the original defective components with what they had
    available. They put in what was modern components at the time and never thought much about it.

    I just rebuilt the large filter/reservoir capacitor box, striving for a strict keeping
    of the original appearance and I'm now in a situation where a good handful of capacitors
    need to be replaced under the chassis and the inevitable dillemas surface ...
    - Who will ever look in there ?
    - Is it important to keep an original appearance inside the set at all ?
    - Should I try to make the new caps look like the old ones did ?
    - Would it merely confuse a future repairer ?
    - Should I follow previous repairers footsteps and simply take out the old ones and fit modern caps ?
    - The set is now 70+ years old but should that be reason for a sudden change of repair policy ?
    - Should I go for a sensible compromise and keep the (through the rear cover) visible parts on
    top of the chassis original and allow modern components in below decks and eventually
    store the old components in a bag or similar inside the set ?
    - Will it ruin the sets history or will it just add to it ?

     

    Martin

    I know what you mean with these dilemma's Martin.

    If it was a piece of antique furniture then any restoration which resulted in a "renewal" of the item would indeed destroy everything that made it an antique in the first place. With this project I would probably disagree in that there is no real antique value in keeping what are basically consumables which are expected to eventually wear out & die. My personal opinion is that you should replace everything with whatever is the best modern equivalent & somehow try to add a record of the origianal spec's for any future restoration. No doubt this beauty will be due for more remedial work in 70 years time.

    Whatever you do is going to be a compromise. The safe restoration of this is inevitably going to compromise the end results so I wouldn't let it worry you Martin. I strongly suspect that the next person who opens this is likely to be an offspring of yoursLaughing

    Chris.

    The use of metaphors should be avoided like the plague. They're like a red rag to a bull to me.

  • 08-06-2010 3:45 PM In reply to

    Re: Master 39K

    @Martin: yes, i know very well what you mean...overhere in NL i know some guys tend to totally fix the cabinet with new laquer or paint and indeed put new caps in old ones etc and in the end i guess the answer to this dillemma lies in what you want with the end result.

    Because....in all fairness...is there a point in making it work at all ??

    What i'm getting at (also having some of these oldies): if they eventually work than why or for what would one use them ?

    It's all wavebands which are (almost) not used anymore and the sound is ''vintage'' but technically there's no point listening to an old radio while we have good stereos etc.

    I mean, i think if i would have mine working they would be put back on display and probably rarely being used, so why bother...

    But yeah, i can see the technical challenge, so don't get me wrong...everyone should do with such a thing whatever they feel is to their liking, but if you talk about ''preservation'' than maybe just leaving it as it is, is keeping it as close to the original...:):)...

    It's just a thought....:)

  • 08-06-2010 4:10 PM In reply to

    Re: Master 39K

    ipaul:

    Because....in all fairness...is there a point in making it work at all ??

    I think there's merit in restoring these old sets. About three years ago I bought one of the very sets that Martin restored, in what I think was his first ever restoration thread on this forum. The set gets used several times a week to listen to the news on the AM wavelength here in the UK. Reception on this set is fantastic, and the warm sound that the valve amp produces cannot be bettered!!

    I do know what you're saying, but perhaps you don't really see the point in having a collection of functioning items? The real pleasure for me is in not only having the sets on the shelf, but actually listening to them - I really get a huge kick out of it :)

    President, Beomaster 8000 Appreciation Society

  • 08-07-2010 8:35 AM In reply to

    • Dillen
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    Re: Master 39K

    Thanks for the inputs, guys. Greatly appreciated !

    The radio is not mine. I was asked to make it work but that does not
    remove the dilemma. It just eliminates the choice of leaving it alone, which I
    probably wouldn't have done anyways if it was my own.

    If it was a very rare and unique item, there would probably be more sense in
    leaving it well alone rather than replacing things.
    But along with the collectors value, that would also show a general interest in
    protecting an investment. This is not really the case here.
    Having said that; For a radio like this, it is my experience that a working
    example, held closely to original appearance will fetch more money if sold, than
    a non-working sold as-is.

    Besides, I feel that a radio like this should work. You should be able to switch it
    on, let it warm up while your sunday morning coffee is brewed and then listen to
    Benny Goodmans 1938 Carnegie Hall Concert in glorious mono on the Medium Wave band with
    crackling and whistling as it comes while enjoying the family breakfast.
    Much more fun than just having it sitting on a shelf or behind glass somewhere, as
    John also suggests.
    Even if the source of the programme is a CD player connected to a local AM transmitter
    in another room of the house.
    Having said that, there are quite a few AM stations still to be heard. Far more
    than FM stations. If they are worth listening to is a different matter. Fishing notations,
    sea weather reports and "radio Moskva" (no offense intended) may not catch wide interest.

    I have given it some thought and I think I will go with a solution that goes like this;
    Keep everything visible as original as possible. That is the exterior as well as
    the upper part of the chassis, that can be seen through the rear vent holes and
    when the back is removed.
    I will allow modern components underneath the chassis and I will fit whatever
    is needed to improve safety, a decent suppression capacitor and a mains fuse
    spring to mind.
    I will also document the work done to the set by me. A printed copy of this thread
    will follow the set, as will all old components that are removed.
    Seen with the radios "eyes", this will then be just another visit to the repairers to
    keep it going. The previous repairers already replaced a good handful of components anyways
    and it would be in thread with the history told by the set itself.

    Martin

  • 08-11-2010 9:55 AM In reply to

    • Dillen
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    Re: Master 39K

    One thing is not smart with this set; It's not easy to test the chassis on the bench.
    The output transformer and speaker sits in the cabinet - that could be solved with
    a couple of long leads but the pushbutton station selector module is in there too
    and the cable connecting it to the chassis is very short to prevent noise/oscillation etc. and should
    not be extended for the very same reason(s).
    I had to dismount the mechanical pushbutton station selector module from the
    cabinet to allow for proper testing of the chassis on the bench.
    Not a huge problem and since the pushbutton mechanism seems to have seized up badly
    it had to come out anyways.
    The top button is depressed and does not release when other buttons are pressed
    which also prevents the others from latching in correctly.

    Martin

  • 08-11-2010 9:58 AM In reply to

    • Dillen
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    Re: Master 39K

    The module is clearly stamped "Kø" for København (Copenhagen) which confirms that
    this set was meant for use in the eastern parts of Denmark, near Copenhagen.

    Martin

  • 08-19-2010 2:04 PM In reply to

    • Dillen
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    Re: Master 39K

    Work progresses slowly, but I have managed to do a little:
    A close inspection revealed that there was nothing seriously wrong with the module,
    it was simply the lubricating grease on the pushbuttons that had dried and become solid.
    A few drops of acid-free oil was applied to the dry spots and the module
    was left to soak in the oil overnight.
    Next day, the whole mechanism functioned perfectly. An additional few drops of fresh oil
    was added for good measure and all that's left now is to clean the whole thing, particularly
    the buttons.
    The tap that sticks up in this photo is connected to the release mechanism.
    It is reachable from behind and pushing it sideways will release any button
    depressed from the front.

    Martin

  • 09-03-2010 2:11 PM In reply to

    Re: Master 39K

    Has Dillen given up here?

    Or just to busy?

    Time for an update right?

  • 09-03-2010 5:41 PM In reply to

    • Medogsfat
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    Re: Master 39K

    Friedmett:

    Has Dillen given up here?

    I very much doubt it!

    Or just to busy?

    Quite probably.

    Time for an update right?

    Patience is a virtue Wink

    The use of metaphors should be avoided like the plague. They're like a red rag to a bull to me.

  • 09-07-2010 5:03 PM In reply to

    • Dillen
    • Top 10 Contributor
    • Joined on 02-14-2007
    • Copenhagen / Denmark
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    Re: Master 39K

    Chris is right;
     - Absolutely not !
     - Indeed !
     - Long over due !

    I've been busy with other things. Repairs from all over had started to pile up
    here and I had to attend some non-B&O related things too but work on this wonderful
    set has not ground to a halt. Not at all.

    This set was born without a mains fuse (!) so I will have to add one.
    I am perfectly aware that this will break away from the original design and inside
    appearance but it is a matter of safety - for both the owner/user and the
    set itself - so I will not compromise here and it should be a fairly easy task
    to fit something below decks somewhere.
    At 220-240V about 1,6A would seem fine. The running power consumption is never that high,
    but we will have to take the warming up into account. The valve heater filaments and also
    the dial lamp have very low resistances when cold so the rush-in current could be a
    bit on the high side.
    A DC reading showed apprx 200 Ohms when cold so that gives apprx 1.2 Amperes
    at the moment of switching on.
    The rush-in current could actually be even higher, namely in case the set is switched
    on right after being switched off, i.e. while the valves are still warm, allowing
    an instant current flow to rush in and fill up the drained filter and reservoir
    capacitors through the still warm rectifier valve and further down through the also
    still conducting output valve to ground.
    I decided to go with a 1.6 Amps slow blow. Tests later on will (hopefully) show if the
    theory holds water.

    I found a good place under the chassis to fit a fuse holder for a
    normal 5x20mm glass tube fuse.
    Right next to the rectifier valve, an empty and already threaded hole was available.
    Probably a hole that was originally used for holding the original output transformer
    but with the external transformer sitting at the bottom of the wooden chassis, this
    hole was now left unused.
    It is fairly close to where the mains lead enters the chassis and there is exactly
    room for the fuse holder underneath. Safe and fully reversible if need be.
    Very nice.

    Photos will follow when time permits.

    Martin

  • 09-12-2010 3:06 AM In reply to

    • Dillen
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    • Joined on 02-14-2007
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    Re: Master 39K

    Now, everything is, if not fine and working, then at least safe to power up.
    Workbench cleared, voltmeter across the high-voltage rail for monitoring and
    the mains connected to a B&O RT12 variac.
    Switching on.
    Increasing mains voltage slowly.
    Watching as the mains current rises slowly.
    Dial lamp starting to glow.
    Up the voltage to about 100 Volts.
    Dial lamp now brighter.
    Up the voltage even further, now around 180V.
    The high-voltage rail starting to show some voltage, climbing as the rectifier warms up.
    Nice so far.
    Around this time the amperemeter on the variac started to react a bit more as the
    output valve also started to conduct current. That also caused an expected minor
    drop in the high voltage.
    Still good.
    Up the mains to the full 220V.
    The smell of warm dust coming now - to be expected.
    The speaker now starting to emit a very faint hum - also to be expected.
    High voltage now around 150 Volts. Where it stayed...
    A bit low for a voltage that is given in the service manual as 200 Volts.
    There may be other fault(s) that will eventually show but this voltage is wrong
    and the reason will have to be investigated.
    This low voltage will not allow for clean reception - actually I had no reception at
    all in this case and it will not allow the magic eye to glow either.
    The good thing is that the most basic functions seem to work and there were no flames,
    smoke, bangs or other nasty surprises.

    Martin

  • 09-17-2010 2:00 PM In reply to

    • Dillen
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    Re: Master 39K

    There can be many reasons for the high voltage to remain low.
    - The output valve drawing a too high current is a typical fault, often caused
    by a leaking grid coupling capacitor.
    The capacitor in this set is a green Philips type. It measured fine when tested with
    a meter and it is of a type that I usually find very reliable. It will, nonetheless,
    be checked again. Components that measure fine with a multimeter at low voltages
    can sometimes change their characteristics when a high voltage is applied.

    The reason could also be the rectifier. A loss of emission (worn valve) will see a
    low output from the valve.

    So no worries, there's still some work to do.  Laughing

    Martin

  • 09-17-2010 2:01 PM In reply to

    • Dillen
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    • Joined on 02-14-2007
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    Re: Master 39K

    A replacement rectifier valve provided a voltage much nearer to that
    mentioned in the service sheet but the set remained silent.
    If the volume was turned way up, a "pleasant" humming could be heard but
    nothing else on any waveband.
    A buzzing sound could be heard if the control grid of the output valve was touched
    with a screwdriver. This was a good sign and it told me that the output valve was
    working.

    This set has a gramophone input. It is connected to the EBC3 (pre-amplifer) valve
    so makes for a nice amplifier test point.
    A B&O TG7 signal generator got connected to the gramophone input and I was rewarded
    with a nice sine sound, clean with no distortion and good sensitivity (volume).
    This was also good news in that it told me that the preamplifier-valve and -circuit
    was also working.
    Next step backwards was the EF5 IF amplifier and CCH2 frontend heptode/triode.
    Replacement valves were test-fitted but that brought no change.

    Next step was voltage readings. Anode voltage(s) on a valve will tell a lot
    about the condition and behavior of a valve and its circuit.
    In this case, everything tallied pretty much with the noted voltages found in the
    service manual. The CCH2 doubles as mixer and oscillator and both anode voltages
    were fine. The anode voltage of the triode section was given as 90V and I had 86V
    so the local oscillator was clearly running.
    If it wasn't, the voltage here would typically have been considerably lower
    at maybe 10-15 Volts or even less.

    I then set up a signal generator, programmed it to the sets IF frequency
    of 440KHz and injected a modulated 400Hz onto the control grids of the
    frontend valve and IF amplifier valve respectively.
    The sensitivity of the IF amplifier stage was given as 6-8mV and I had a nice and
    clear signal at just about 3mV so that stage was doing fine.
    The frontend, however, was a different matter; Sensitivity here was given
    as 100-150uV (microvolts) but I had to inject about 2mV (millivolts) to get
    an audible output.
    The magic eye remained dimly lit but frozen.

    Next step would be to check the adjustments of the first IF coils, the ones
    working with the CCH2 valve.

    With the signal generator connected, it was soon clear that the first IF section
    operated at 444KHZ. Not the world off from the correct 440KHz but easily enough to
    disturb proper operation and reception.
    It was adjusted down to factory specs and the set was tried again.
    A long antenna (about 5 meters of wire across the floor) and the set came up
    talking swedish, I had struck a gardening programme.
    What a nice surprise !
    Well, it turned out to be the only station on the wavebands and it was a bit noisy
    but it was a result.
    The best so far and a sign that I was not too far from having a fully working
    Master 39K on the bench.
    The magic eye, however, was still frozen and I would expect a top notch set like this
    to perform much better.

    Martin

  • 10-05-2010 5:12 PM In reply to

    • Dillen
    • Top 10 Contributor
    • Joined on 02-14-2007
    • Copenhagen / Denmark
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    Re: Master 39K

    OK, time to realign this thing, then.
    With an AM set like this, it's not very hard to reach a good alignment, even by ear.
    Basically, what you do is tune in to a good clean station and simply adjust the IF coils
    for maximum volume.
    This set has two sets of coils to adjust.
    It turned out, that even the coil(s) I adjusted earlier could be set better. That just
    goes to show how things can sometimes be a bit "flimsy" and goofy with these old machines.
    Anyway, the wavebands were now filled with stations. Particularly the Medium Wave
    band as expected. Experience has it that short wave is pretty quiet in my neck
    of the woods but still a few stations could be heard using a long antenna.
    But no AFC and no reaction from the magic eye.

    I then decided to set up my own little AM transmitter.
    Programmed it to send at 850KHz, which is around the center of the MW range on this set.
    The transmitted signal came through with good volume and great sound. Even the AFC did
    something now.
    The magic eye, however, remained frozen.

    I scrutinized the circuit for the magic eye, even replaced a couple of resistors
    but couldn't find anything wrong.
    I found an old handwritten note in a service manual, telling something about changing
    a resistor to a larger value for greater deflection on the eye. I tried it but it didn't
    change anything.
    I even tried a replacement magic eye with the same result.
    Like a cathode ray tube (CRT "picture tube") the magic eye has a surface covered
    by phosphor, that lights up when hit by an electron stream. This makes the eye glow green.
    And just like a CRT, a magic eye can also have burn-in marks (remember screen savers?).
    This particular magic eye has a well defined burn-in mark right at the exact same area
    where it lights up now. It looks as if it was never lit any higher so I lean more and more
    towards the theory that the previous owner, just like I, hadn't got an antenna strong
    enough to give any deflection on the eye.
    That could also explain the need for "greater deflection", as suggested by the
    hand-written note.
    Not having a similar known good set of the same type at hand, I am tempted to say that
    this is how it's made and it will take a very good and strong, possibly directional,
    antenna to give better results.
    Whatever, I had plenty of international stations, even on just a meter of wire.
    The tonecontrol proved to be a bit "muffled". A shot of contact cleaner and a little
    exercise cured this.
    A small amount of crackling when tuning. This comes from the large (open vanes) tuning
    capacitor, it can be considered normal and will, no doubt, cure itself with use.
    The set played all evening, good sound and good continuity. No drop-outs, cracks or
    whistles. Just a slight modulation hum which is normal when I use the local
    AM transmitter.

    Martin

  • 10-07-2010 3:50 PM In reply to

    • Dillen
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    • Joined on 02-14-2007
    • Copenhagen / Denmark
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    Re: Master 39K

    I haven't been updating this thread a lot recently. It doesn't mean that I haven't been
    working on the set, merely that I haven't had time to do the writing.
    The Master 39K is close to being ready as you can tell from my previous post.
    That is, I still have the magic eye issue but I simply cannot see why it doesn't react;
    The circuit matches the schematics, all voltages are spot on, all components and all
    other valves are good and a factory new magic eye makes no difference.
    I will have to deem this repair done but I will keep thinking about this issue until I
    find a similar working set to compare with. The owner reads this post and I've also
    email'ed him the status so he knows that I've been struggling with this.

    When I haven't had a lot of time for writing it's basically because I have a nice
    selection of other repairs here too at present. I also have a life besides this hobby thing
    and just when I thought I couldn't get more busy, the Master 39K owner told me that he
    bought another set.
    I couldn't believe my eyes when I saw this ...

    Martin

  • 10-07-2010 8:16 PM In reply to

    Re: Master 39K

    What a beauty, forget the life beside and get on with it. Big Smile

    Dillen:

    I haven't been updating this thread a lot recently. It doesn't mean that I haven't been
    working on the set, merely that I haven't had time to do the writing.
    The Master 39K is close to being ready as you can tell from my previous post.
    That is, I still have the magic eye issue but I simply cannot see why it doesn't react;
    The circuit matches the schematics, all voltages are spot on, all components and all
    other valves are good and a factory new magic eye makes no difference.
    I will have to deem this repair done but I will keep thinking about this issue until I
    find a similar working set to compare with. The owner reads this post and I've also
    email'ed him the status so he knows that I've been struggling with this.

    When I haven't had a lot of time for writing it's basically because I have a nice
    selection of other repairs here too at present. I also have a life besides this hobby thing
    and just when I thought I couldn't get more busy, the Master 39K owner told me that he
    bought another set.
    I couldn't believe my eyes when I saw this ...

    Martin

     

    Beosound 3000, BL 4000, BL 8000, BG 2404,BG 5000, BG CD50, Beocord 5000, BM 901, BM 2400, BM 4000, BV S45, BV 3702. There is nothing we cannot do, but a lot of things we don't want to do!!

  • 10-07-2010 8:18 PM In reply to

    Re: Master 39K

    its just beautiful, Martin may I copy the pic for keepsake ??

    Beosound 3000, BL 4000, BL 8000, BG 2404,BG 5000, BG CD50, Beocord 5000, BM 901, BM 2400, BM 4000, BV S45, BV 3702. There is nothing we cannot do, but a lot of things we don't want to do!!

  • 10-09-2010 6:25 PM In reply to

    • RUDYV
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    • Gold Member

    Re: Master 39K

    WOW, what a beauty !!!

    Unbelievable, a Master de luxe 38 K, NOS.

    Still under waranty ?

     

    I'm ready for it !!!!!!

     

    Rudy

     

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