I have a friend's Silvertone 1482 amp on my bench. Schematic is in attachment.
All the tubes and the pilot lamp lit, but no sound comes from the speaker. If I touch the jack legs inside the chassis with my bare fingers I hear a sort of very weak buzz coming from inside the chassis, not from the speaker.
The rectifier (a fresh NOS 6AX4) shows only 255 VAC on the plates and 266 VDC on the cathode. As a consequence all voltages are lower than specs throughout the amp (I checked only the filter caps nodes and the plates on the power tubes actually)
The heaters read 6.16 VAC between both ends.
Readings don't change with another new 6AX4.
Could it be the power transformer?
What readings should I expect if I disconnect its wires?
With such low tension going to the amp, shouldn't the amp sound all the same (maybe weaker than normal)?
All the tubes and the pilot lamp lit, but no sound comes from the speaker. If I touch the jack legs inside the chassis with my bare fingers I hear a sort of very weak buzz coming from inside the chassis, not from the speaker.
The rectifier (a fresh NOS 6AX4) shows only 255 VAC on the plates and 266 VDC on the cathode. As a consequence all voltages are lower than specs throughout the amp (I checked only the filter caps nodes and the plates on the power tubes actually)
The heaters read 6.16 VAC between both ends.
Readings don't change with another new 6AX4.
Could it be the power transformer?
What readings should I expect if I disconnect its wires?
With such low tension going to the amp, shouldn't the amp sound all the same (maybe weaker than normal)?
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