Valve preamp.

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Valve preamp.

Kalee20

Engineer in Charge

Posts: 816
Reputation: 9
Location: Lynton, N Devon

11-12-2019, 05:42 PM

It's a point well made - a grid stopper right on the grid pin is good practice.

Drawing stray capacitances, and imagining lead inductance between the grid pin and a 'stiff' source, you can see you've created a Colpitts oscillator.

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Messages In This Thread

Valve preamp. - by Diabolical Artificer - 07-06-2019, 04:32 PM

RE: Valve preamp. - by Diabolical Artificer - 15-06-2019, 06:12 AM

RE: Valve preamp. - by Diabolical Artificer - 10-12-2019, 06:15 AM

RE: Valve preamp. - by Diabolical Artificer - 10-12-2019, 03:33 PM

RE: Valve preamp. - by BusyBee - 10-12-2019, 05:19 PM

RE: Valve preamp. - by Diabolical Artificer - 11-12-2019, 07:32 AM

RE: Valve preamp. - by Kalee20 - 11-12-2019, 12:36 PM

RE: Valve preamp. - by BusyBee - 11-12-2019, 07:02 PM

RE: Valve preamp. - by ppppenguin - 11-12-2019, 01:20 PM

RE: Valve preamp. - by Kalee20 - 11-12-2019, 05:42 PM

RE: Valve preamp. - by Mark Hennessy - 11-12-2019, 08:41 PM

RE: Valve preamp. - by Terry - 12-12-2019, 12:09 AM

RE: Valve preamp. - by Mark Hennessy - 12-12-2019, 12:59 PM

RE: Valve preamp. - by Terry - 12-12-2019, 02:37 PM

RE: Valve preamp. - by BusyBee - 13-12-2019, 04:42 PM

RE: Valve preamp. - by Mark Hennessy - 13-12-2019, 07:19 PM

RE: Valve preamp. - by Diabolical Artificer - 12-12-2019, 06:35 AM

RE: Valve preamp. - by Diabolical Artificer - 12-12-2019, 03:29 PM

RE: Valve preamp. - by BusyBee - 16-12-2019, 07:09 PM

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