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ampage archive
Vintage threads from the first ten years
5f1 champ plate voltage
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 2/9/2003 5:30 PM |
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| koolaide | 5f1 champ plate voltage I have a homebrew 5f1 tweed champ-built from a kit from clark amps-sounds great..., but the plate voltage is 391v on a 6v6 gt. current checked w/ transformer shunt method is 36ma. this(the voltage) seems high and based on tub data the plate v max is 350 -is this a real problem or not? and whats the soultion? my electroncis knowledge is minimal-it'been a big learning curve. thanks koolaide |
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| 2/28/2003 1:16 AM |
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| Bob R | According to your data, it looks like you're running that tube at about 14W. A little high (should be around 12W). You'll run through tubes a little faster but it probably sounds great. If you want to lower your plate current a little, raise the value of your cathode resistor slightly (say to 510 if you presently have a 470 in there). |
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| 2/28/2003 9:28 PM |
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Bruce /Mission Amps |
I think it sounds better to lower the plate and screen voltage a little and keep the idle current higher so the tube is still arund 12-14 watts. Bruce |
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| 3/7/2003 11:17 PM |
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| bob predaina | i'm no expert, but are you running an authentic reproduction transformer off of a 123 vac power source? if so that could explain why your voltages are so high. maybe the solution would be to just use a variac to bring your line voltages down to 110, and everything may fall into spec. IIRC, the 5F1 had plate voltages around 340-350VDC. at 391 vdc, I'd guess that the tubes would sound brighter, and that the tonality woule be alot more like a SF champ. |
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