BeoGram

Re: Beogram 4002 cable identification

yachadm — Sun, 23 Jan 2011 01:02:51 GMT

The CD4 switch at the OFF position activates the function of a standard Stereo RIAA amplifier.

The CD4 switch at the CD4 position activates the quadraphonic decoding circuits.

The MMC4000 is not capable of picking up the 30kHz carrier-signal on a CD-4 LP, so you don't ever have to put the switch at the CD4 position.

Only if you have the B&O MMC5000, MMC6000, or the SoundSmith SMMC20CL cartridges, will the CD4 position be of any use.

And for only STEREO LP's (as opposed to Quad LP's), the MMC4000 (or SMMC20EN) is a nicer sounding cartridge, than the more expensive cartridges mentioned above.

Regarding your cable, if you want a ready-made cable with the 4 RCA plugs already professionally made (I think you'll have a heck of a job with the single signal-ground silver cable to 4 plugs), contact lazerwave - I send o lot of customers to him - Tell him what you want, and he'll custom-build it for you.

http://myworld.ebay.com/lazerwave&sspagename=ADME:X:CEM:US:11

You'll just have to solder his cable to the CD4 connector in the photo.

And if you want more details on taking care of your BG4002, download this

http://www.condoraudio.com/wp-content/uploads/Projects/BeoGram-4002-6000-Turntable-Restoration-Repair.pdf

Menahem

Re: Beogram 4002 cable identification

beostick — Sat, 22 Jan 2011 22:04:00 GMT

Hey Menahem, Thanks so much, this is exacty what I needed. I'll try and work on it this weekend. To use that CD4 demodulator as a phonograph preamp do you have to switch the switch on the side to "CD4" and does it work fine if only using a stereo mmc4000 cartridge and front L & R outputs (not 4channel)?

Thanks s much, your help is already great!

Re: Beogram 4002 cable identification

yachadm — Fri, 21 Jan 2011 04:20:18 GMT

Hi BeoStick

If you have the CD4 demodulator, your connector should look like the picture:

Red - Right Rear +

Blue - Left Rear +

Yellow - Left Front +

Brown - Right Front +

Their Minus signal is the common SIGNAL ground - the silver wire layer.

The outer copper layer is ground to the casing of your receiver/amplifier. The silver wire layer and outer copper layer are NOT connected together - you can open your BeoGram to see this!

That CD4 demodulator is a superb RIAA amplifier - you do not need another phono preamp with it!

Connect the cable to your amplifier's Line-in connection (Tape/ CD/ VCR/DVD).

Menahem

Beogram 4002 cable identification

beostick — Fri, 21 Jan 2011 01:20:37 GMT

I recently acquired a Beogram 4002 in near mint condition and really like it. Everything works flawlessly on it except one thing. Someone had previously hacked off the DIN Connector and did a poor job of putting on some RCA connections. It's been working but with intermittent drop outs in the left channel that were fixed with a wiggle of the plug at the amp connection. It's gotten progressively worse and it's time to fix it. I removed the butcher job the previous person had done, but now have a problem figuring out what wires are what. Not finding much help in searches, only PIN indentifiers, which don't help me because I don't have the DIN connection on it. What I do have is this. The cross section of the cable goes like this:

Outer Copper colored wire layer, layer of insulation, then a silver wire layer, then another layer of insulation, then in the center core 4 wires with insulation colors Red, Blue, Yellow and Brown. So I just want to start from scratch here and solder new RCA connectors to this. But I need to know what each of these wires are for. ie: Right+, Right-, Left+ and so on. I wasn't able to confidently indentify them when taking the old ones off because they were too messed up and want to make shure they're right this time anyway. This does have a seperate ground wire which appears to be OEM also. And of course it does have the 4 channel capability, which I won't be using. But I don't know if any of those wires have anything to do with that. Are the inside colored wires like a standard tonearm wire scheme of some kind, like you'd see plugged into a standard cardridge? Any help indentifying these wires would be greatly appreciated So I can get my signal again. Otherwise I love this 'table and want to keep it going.

Thanks in advance for any help or info in the right direction!