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Re: [Amps] GS35B Idle Current drifting up.

To: "Carl" <>,<>
Subject: Re: [Amps] GS35B Idle Current drifting up.
From: Paul Baldock <>
Date: Thu, 19 Dec 2013 08:37:03 -0800
List-post: <">>
It's a real 50V

- Paul

At 06:47 AM 12/19/2013, Carl wrote:
Is that a real 50V at the tube or is there a leaky filter or other cap in the circuit? Or a solder joint in the filament choke, socket, etc adding resistance?


----- Original Message ----- From: "Paul Baldock" <>
To: <>
Sent: Wednesday, December 18, 2013 2:48 PM
Subject: [Amps] GS35B Idle Current drifting up.

I've been running a GS35B for a year or so. Initially with B+ at 4KV I had the bias voltage set at 30V and an idle current of 200mA. The idle current has been slowly drifting up over time. Now it takes 50V of bias to get the idle down to 200mA. I can still easily get 1500W PEP out. Any idea what's happening?

- Paul  KW7Y

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