Magnavox Imperial Stereo

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Re: Magnavox Imperial Stereo

Post by Wildcat445 on Sat Jun 28, 2014 9:36 pm

The tube stereo Imperial models are a step down from a Concert Grand, the cabinets are similar and the electronics much simpler. If the cabinet is nice, with only cleaning and polishing required, then $250 is on the higher end of reasonable, in my opinion. If it is local, so you don't have to pay shipping and crating costs, then the $250 is more reasonable. They are "magnificent" instruments, and you won't be sorry you own one. I cannot stress enough the necessity of completely going thru both the amp chassis and the tuner if you want dependable performance.

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Re: Magnavox Imperial Stereo

Post by TubeDaddy on Sat Jun 28, 2014 10:08 pm

Oh, I would replace all the capacitors in the amp and tuner, check all the resistors, and replace any bad tubes. I wouldn't want to operate it but briefly before restoring the two chassis.
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Re: Magnavox Imperial Stereo

Post by Wildcat445 on Sat Jun 28, 2014 10:18 pm

Mine had a burned cathode bypass resistor, R81 on the schematic, a 130 ohm, 5 watt wirewound. I suggest that you pay close attention to this resistor, as it affects the bias on the bass amp. Good luck.

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Re: Magnavox Imperial Stereo

Post by TubeDaddy on Sat Jun 28, 2014 10:26 pm

I always probe the resistors to be sure there are no broken leads, and also check to see if it's internally broken as well. Then, I do a continuity check on all resistors. After that, I use my meter and get an ohm reading from each one. I usually catch any bad resistors before I even finish the recap.
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Re: Magnavox Imperial Stereo

Post by Wildcat445 on Sun Jun 29, 2014 9:40 pm

I performed all the usual tests you mentioned, and that resistor still "snuck" up on me. I had never had one act quite like that before. Although it provided a hold up on the project, I was looking for bad components, and found this, so I'm not disappointed. Better to find it now than to put it back into service and have a problem.

My Imperial stereo has lots of miles on it, confirmed by how many out-of-range components I found, and by the statements of the man I bought it from. I have the changer all cleaned and lubed, motor cleaned and lubed and the motor mounts changed. I adjusted the drive mechanism so that the wheel would better follow the motor pulley. I have everything cleaned well and back into the cabinet. I am waiting to replace the needle until I am sure I am done working on the changer. When I get the cathode resistor replaced, I will be ready for the trial run.

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Re: Magnavox Imperial Stereo

Post by TubeDaddy on Mon Jun 30, 2014 1:35 pm

That's strange that a resistor would test good and still be burned into internally.
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Re: Magnavox Imperial Stereo

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