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The 6.3 volt pilot lamp voltage is reading 7.04 volts and has blown the lamp. When I checked the voltages on the 6L6's #3 should be 440v and is 457 and #4 should be 435 but is 459v. The amp works and sounds fine except for the tremolo doesn't work and the low volume on the vibrato channel. Is the power transformer bad or is there something else driving up these voltages?
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It was probably made for a lower wall voltage than the one we're seeing today.
Check out R.G. Keen's site geofex.com - he has a guide for "vintage voltage". -
Remember that Fender schematics have the notation "Voltages read to ground with an electronic voltmeter +/- 20 per cent." So you're well within normal tolerances. It sounds as if you have other issues going on that are keeping the trem from working and the lousy volume on that channel. Get another bulb, and maybe think about putting a small resistance in series with it to knock the voltage down to nominal for a filament circuit (6.3v).Comment
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No need to do anything but change the bulb.
I think most of the #47s and jewels are too bright anyhow....I frequently use 1816, 12v bulbs in amps with 6.3v filament supplies. It doesn't hurt anything and they draw less current too.
Less glare, still bright enough to see on stage etc etc etc....
There are other BA9S based bulbs beside the classic #47.Comment
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