Assuming that the electrics are good (which they usually are), this entire series suffers from one MAJOR mechanical fault, which is easily repaired with patience. Open up the BG, and look at the solenoid in the middle of the main PCB. Carefully disassemble the solenoid, and pull out the piston inside the solenoid. Before doing anything else, mark one

Hi Martin, Nice job! I always like to see restorations! If you need any capacitors or tubes, let me know - I have a good selection of tubes from the same era, for restorations I have done on Saba and Grundig radios of the 1950's. Or any other parts you have trouble finding, at all! Nice to see the MPX - the 19kHz and 38kHz coils look in good shape

I would have liked very much to check the specs on these Sansui "woofers", but no data is available. I was very suspicious of them at the beginning, because they have a tiny magnet, the entire speaker weighs less than 6 oz. So what I did, I connected them up to my signal generator, to see what kind of audio response I could get out of them

Yes, these S45's are the Type 6302's, with me since 1977. The older, the better! The nominal impedance is not that critical, when attempting to minimize deficient bass response. What is more important, is at which frequency(s), the peak impedances occur - sometimes as high as 48 ohms. The impedance of a given speaker will vary between the DC

Hi Martin, Thanks for your offer. As far as I remember, the original S55 woofers were very bass-deficient anyway. I much prefer the S45's. From all the current Seas and Peerless 8" woofer products, I could not find a single one which physically fits in the S55's weird rear-mounting hole. But I have found a pair of Monacor SPH-200KE woofers

Disconnect the speaker from the amplifier. Take a 9Volt battery - touch the wires briefly to the battery. If the woofer jumps forward towards you, then the Positive wire is on the Positive battery terminal. If the woofer jumps backwards into the speaker, then the Negative wire is on the Positive battery terminal. Works for any speaker. There are other

Hi all, I have a pair of BeoVox S55 (type 6426) woofers in for restoration. At some point in the past, the owner tells me that the foam surrounds decayed, and the "repairer" didn't know how to repair them, so he just put in a convenient pair of atrocious Sansui woofers, which sound like one is listening though a thick curtain - positively

OK, I'll set 8mV across one resistor. At the risk of sounding ignorant, how do I check for self-oscillation? That's a new one for me. OK, I read the BM7000 post, and I see your comment about putting the scope on the signal path and power rails, so that's understood, unless you want to add something else. However, I'm going to wait on

Ok thanks - I'll get a couple. In the meantime, this quiescent current adjustment is bothering me. In the BM5000 SM, it shows the 11mV measurement to be taken across the TWO bias resistors (in series) on each channel. I must admit that this is the "newest" BeoMaster I have restored, all others being of 1960's and 1970's vintage

Sound is very nice when playing at relatively low volume, and it does not cut out to Standby, but if I up the volume to about 3, it will cut out to Standby after about 2 minutes, and the fan does not start up. There is another problem - the RL1 relay on the PSU board is faulty - I took it out and cleaned the contacts, but one side is still not making