[Amps] 8650AS Grounded Grid

Roger (K8RI) k8ri at rogerhalstead.com
Mon Mar 25 16:14:17 EDT 2013


On 3/25/2013 11:21 AM, Glen Zook wrote:
> The 8560A is basically a 4CX250B with conduction cooling rather than air cooling.  Therefore, I would look at the various circuits for the 4CX250B.

If you have the BeO2 block, it's easy to machine a solid anode block to 
match for the GI-7B

73

Roger  (K8RI)


>
> 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.
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