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Vintage threads from the first ten years
5E3 Filament circuit
 4/12/2000 3:52 PM |
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rmike | 5E3 Filament circuit Hi: After 2 years of lurking and reading, I finaly started my first DIY! I'm going to be asking what are probably a lot of simple questions... I'm trying a 5E3 tweed deluxe. I've decided to change the filament circuit from stock to the one used in later fender amps (SF, maybe some BF?), as described in "Tube Amp Talk..." by Gerald Weber. It's the artifical center tap (two 100 ohm resistors to ground, one on each side, to create an "artificial" center tap) and the filaments for each tube wired in parallel. From what I understand this will be a better circuit (quiter? safer? ?) I've got the two 6V6 filaments wired up in parallel but am unsure of how to wire the 12Ax7 and 12Ay7 sockets parallel to the 6V6s. Esentially the shared filament pin (pin 9, if I remember correctly) of the 9-pin tubes are causing me confusion. I looked at a schematic for the SR AA568 which apparently has this heater circuit but I couldn't make sense of it. Can anyone help me to wire this up? How do I parallel the 9 pin filament leads (pins 4, 5, and 9 (?)) to the 6v6s (pins 2 & 7)? Do I just tie 4 to 5 and use pin 4 and 9 in parallel like i used pins 2 and 7 on the 6v6? Thanks to anyone who can help and please feel free to correct me on any and all factual errors (pinouts, circuits, etc.) mike |
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| Carl Z Mike; |