![]() ![]() A capacitor installed backward will conduct electricity, and act just like a leaky one. If you have recapped, check again for proper polarity. I am suspecting a filter capacitor if you haven't changed them yet, and if they are getting hot from leakage, they can build up a dangerous amount of pressure, and give one a face full of hot electrolyte. Excessive current means something is getting hot. I think that the only reason for the battery eleminator Voltage drop could only be caused by excessive current draw. This will then differentiate that the prime problem was not related to a gradiated bias shift in the current hungry AF output stage. Theeeeeeen twidddle your thumbs until "THE" prescribed time approaches, and see if the voltage has / had started dropping. :Initilly, trace down your centertap of the output transformer and tack in a 10k 10 watt wirewound to ground from that buss line and then unplug your two AF output tubes and have your metering conected to that B+ point and fire up the set and then clip on and take a B+ DC reading just as soon as the voltage initially stabilizes. It will be dependent upon the disabling of the output tubes so you will no longer be able to hear the audio.(However, if you have a scope you might watch it upon the plate circuitry of the AF driver stage, should you be feeding in a stable 400 / 1000 ~ modulated signal from a generator.or even AC meter it.in case of the later stable modulated sourcing). :relevant to the potential other options of power supply or DC leakage therein related. Specifically, to see if the problem might be audio output / circuit related. :As a starter, would you try this analysis. ![]() ![]() Initilly, trace down your centertap of the output transformer and tack in a 10k 10 watt wirewound to ground from that buss line and then unplug your two AF output tubes and have your metering conected to that B+ point and fire up the set and then clip on and take a B+ DC reading just as soon as the voltage initially stabilizes. ![]() Relevant to the potential other options of power supply or DC leakage therein related. VIII, pages Motorola 8-9 and 8-10.As a starter, would you try this analysis. The schematic diagram and alignment instructions are in Rider Vol. The Motorola 9Y is a 9-tube, 3 band, superhet from the 1937 model year. Thanks for any info you might provide for me. There are two doors on the bottom of the radio which open to a large compartment divided into two sections and there is a section that once held lots of drawers but currently there is only one in place. It is in a mahoghany (I think) dark wood cabinet with a tuning dial that switches into three positions, on/off switch/ volume control, speaker mounted inside with a mesh covering on the left side. Has anyone had any experience with this particular type of radio. :Help!! I recently purchased a Motorola Superheterodyne Model 9Y in working condition and can't find any information at all on the internet. ![]()
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