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?
Carl
KM1H
----- Original Message -----
From: "Paul Baldock" <paul@paulbaldock.com>
To: <amps@contesting.com>
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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