Thanks for the comments Progress remains good and all four channels are working well. Slow but sure remains the best policy. The one problem that is holding me up and irritates me is the loud thud through the speakers when power is switched on. Any information on where best to find the solution to that one will be appreciated. Regards Geoff

Hi Everyone ICs arrived yesterday and Dillen's audio caps came today. Thanks Martin Hard work putting it all together and there was a lot of testing to do. However, power was eventually put on and nothing sparked. Finally, I heard the sounds of a radio station. What a relief and plenty of joy. I will have a long beer tonight to celebrate and tomorrow

Hi everyone While waiting for spares, I have been able to check out the other three amplifiers and everything is looking good. First I checked the output voltages to the audio capacitors and they were nicely around 29V – no problems with the overall IC performance on those three. The second thing I checked were the trimmers. I measured the total

Hi everyone Unfortunately, my Beomaster quad project is clouded by bad news at the moment. I have been investigating the situation on the left rear amplifier and as mentioned earlier, transistor TR4 is sitting there with an open collector - emitter circuit. It was probably like that when I was given the machine and it was never identified as a firm

Thanks Soren, but all I am getting at the moment is a golden bill for spares. Anyway, at least it is all a lot of fun. Geoff

Hi Ferdinand I was pleased to read about your success in fixing those switch levers and always get excited when I hear that some lateral thinking has saved yet another machine. It is not unusual to find that the simple fixes are often the best and with a bit of ingenuity, one can squeeze out many extra years of good performance. The repair might not

Hi everyone - thanks for the comments but it is far too early for congrats - those are reserved for when we hear some good sound out of this machine. Even after the success of putting power on yesterday evening, I didn’t sleep well last night. I seemed to be dreaming about the shape of the new ICs and whether this was going to cause any problems

Hi everyone Some of my spare parts arrived today and I quickly started to reassemble the left rear amplifier. The first task was to reposition the small IC9 on its mini board. The old setup seemed to have an excess of solder on it so I cleaned it all off and then bend the legs on the new IC to fit the holes. I then discovered problem one, the equivalent

Hi I am afraid that there is no simple answer to your problem. You will definitely need some decent equipment to help investigate the situation and if you haven’t got that – you are stuck. A four point program to fixing the unit might be as follows: Become a silver member and access the schematics to find out just what you are up against

Hi everyone I have now removed some more parts from the Left Rear amplifier circuit and the situation is as follows: 0IC8 and 0IC10 are out and both had failed. 0IC9 is now out and has also failed. 11R48, the 0.12ohm resistor is open circuit The matching emitter resistor 11R49 is out but was OK 11R41 trimpot is out. This was definitely open circuit