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Old 9th January 2010, 09:27 AM   #1
Tyimo is offline Tyimo  Hungary
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Default 6N6P question

Hi!
I would like to ask from the experienced peoples:
- Does this tube need a grid resistor (grid stoppers)?
- What is an ideal value of the output bleeder resisitor? (after the output cap)

Greets:

Tyimo
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Old 9th January 2010, 10:05 AM   #2
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This tube, being hi gM and low impedance will CERTAINLY need a grid stopper. Only low gM tubes run in high impedance circuits don't need them, all other tubes it's safer to use them, at least at first.

Practical experience!

Regards, Allen
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Old 9th January 2010, 11:07 AM   #3
Tyimo is offline Tyimo  Hungary
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Thanks Allen!
Yes, I thought to use 1K for grid stopper, but a saw many design without it and it confused me.

What about the output bleeder resistor? 1M or 470K? I saw even 10K.
Tyimo
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Old 9th January 2010, 12:11 PM   #4
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by Tyimo View Post
Thanks Allen!
Yes, I thought to use 1K for grid stopper, but a saw many design without it and it confused me.

What about the output bleeder resistor? 1M or 470K? I saw even 10K.
Tyimo
bleeder resistor is there just to discharge output cap , in situations where same is "loadless" .

lower in value - faster discharge..... nothing more

feel free to use anything form 100K , up to 1M
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Old 9th January 2010, 12:30 PM   #5
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Tyimo,
I would start with a 1k grid stopper - RIGHT at the grid pin on the tube socket - and when it's all working maybe you could try reducing it down to say 330 ohms, but I wouldn't trust anything less than that. Unless you have 250MHz scope/or spectrum analyser and know how to use it.

What ZenMod says about the bleedeer R is correct, I always use 1 meg. 10k would be just stupid, IMO.

Regards, Allen
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Old 9th January 2010, 06:31 PM   #6
Tyimo is offline Tyimo  Hungary
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Thanks Zen Mod and Allen!
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