bias meter and pot lead length

frank2395 · 14th April 2005, 01:51 PM

based on diagram, (existing arrangment is inside chassis (chassis can not be altered)and i would like to make them external for ease of adjustment for tube rolling)

what length of lead can I use to make these (pot and meter) external i.e 200mm (based on noise pick-up etc)

Sch3mat1c · 14th April 2005, 05:14 PM

Doesn't matter unless the impedance of the driver is very high (211 amp eh? Yeah, you're safe...no one EVER uses pentodes anywhere...).

If in doubt, slap on a nice electrolytic from wiper to ground.

Tim

Enzo · 15th April 2005, 11:47 PM

That is a 1 ohm resistor. ANy noise trying to get in will have to overcome that low 1 ohm impedance. In short, nothing is going to get in that way. It will not be a critical bit of wiring.

14th April 2005, 05:14 PM	#2
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Doesn't matter unless the impedance of the driver is very high (211 amp eh? Yeah, you're safe...no one EVER uses pentodes anywhere...). If in doubt, slap on a nice electrolytic from wiper to ground. Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

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15th April 2005, 11:47 PM	#3
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	That is a 1 ohm resistor. ANy noise trying to get in will have to overcome that low 1 ohm impedance. In short, nothing is going to get in that way. It will not be a critical bit of wiring.

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