[Amps] 8650AS Grounded Grid

[Glen Zook]

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 at yahoo.com>
To: "Amps at contesting.com" <Amps at 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.