The 8560A is basically a 4CX250B with conduction cooling rather than air
cooling. Therefore, I would look at the various circuits for the 4CX250B.
The Russian GI-7b and GI-7bT tubes work well in the SB-230. However, they do
require a fan or blower.
Glen, K9STH
Website: http://k9sth.com
________________________________
From: K4MT <k4mt@yahoo.com>
To: "Amps@contesting.com" <Amps@contesting.com>
Sent: Monday, March 25, 2013 2:03 AM
Subject: [Amps] 8650AS Grounded Grid
I know some tetrodes have been successfully run in cathode fed grounded grid
configuration. Is the 8560AS one that will run grounded grid without going
through the trouble of creating screen supply? I have been thinking about
putting one in my SB-230 to keep the silent operation.
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