[Amps] Fw: "Tubes 201" - How Vacuum Tubes Really Work

[Will Matney]

Peter,

Thanks! That is the very point I have been trying to get across all along! Remember, the original threads were asking about a 3-500Z with the grid resistor or fuse in G-G., or it was when I jumped in the mix There's been a lot of other tubes and circuits dragged into the discussion, but I've tried to center my comments around a 3-500Z G-G circuit. In grid driven circuits though as in receivers and transmitters, or some amps, the grid can be made to go positive for part of a cycle. This I think Rich means also. He can correct me if I'm wrong.

Thanks,

Will


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On 7/25/06 at 8:40 PM Peter Voelpel wrote:

>Hi Will,
>
>when the grid is kept grounded it can not become more positive then the
>cathode if that is grounded and not negative biased as well, except by RF
>drive on it above its choke.
>
>73
>Peter
>
>-----Original Message-----
>From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
>Behalf Of Will Matney
>
>Peter,
>
>On that, I agree it's the only way to make one positive (for only part of a
>cycle). Are there any other ways to make the grid positive and the grid be
>at ground potential with the cathode at ground? A lot of amps cathodes are
>at ground potential unless biased.
>
>Best,
>
>Will
>
>
>
>*********** REPLY SEPARATOR  ***********
>
>On 7/25/06 at 8:04 PM Peter Voelpel wrote:
>
>>Nothing is easier then that if the cathode is going/driven negative with
>>respect to ground.
>>Grid voltage is always measured from grid to cathode, not to ground.
>>
>>73
>>Peter
>> 
>>
>>-----Original Message-----
>>From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
>>Behalf Of Will Matney
>>
>>please explain how a grid becomes positive when tied to ground?
>>
>>
>>
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>
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