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found the problem!!! only one of the filament pins is correctly attached at the base!!! resoldering now, but cant test properly as its late at night.
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i resoldered it last night, and it worked. i had put a component lead between pin 4 and 5, and assumed when i soldered pin 4 in the solder had flowed around the lead when i soldered the heater lead to the pin.
guess the tube was putting out some signal was due to the heat radiating from the other trode., which also explained the voltage drop (12v it was, looking back i should have questioned why that was so low).
thanks for all the suggestions. will post some comments on tone when i get time to play it.Comment
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just had a better play through it. i am very happy with it. the hum is quite tame and it seems significantly louder than my pp el84 build (based on an ac15 normal channel, both running into the same 2x10). the amp really roars at volume i didnt experement too much with settings, but they seem to be pretty versatile. i had the channels jumpered, with the 2 channels running at 10-11 oclock, and the tone at 2oclock. sounded very good with 2 guitars. one with humbuckers, and the other with single coils.
i will post a proper amp thread once i get the amp into a cabinet, and decide on/finish the circuitry regarding the fixed bias mode.Comment
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