Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: nandrewjackson on August 26, 2013, 09:42:12 pm
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It seems that most layout diagrams show the input grid resistor always jumps over to pin 6 on the 6L6. Why? Is it just a layout thing?
Isn't pin 6 an "empty" pin?
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I thinks it's done for 2 reasons....
1 - It's best to have the grid resistor as close to the grid as possible - as in directly on the tube socket pin - and...
2 - Like you said, pin 6 is unused/not connected internally therefor it makes a very convenient and sturdy place to mount the resistor....
May be other reasons too....but that's the way I understand it.
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Most Fender amps mount a 470Ω/1W screen resistor between pins 6 and 4. And the 1.5KΩ grid stopper is mounted between pins 1 and 5.
It's just convenient. Pins 1 and 6 are both available on a glass 6L6 or 6V6 .
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Thanks!