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1. [Amps] 8650AS Grounded Grid (score: 1): Author: K4MT <k4mt@yahoo.com>; Date: Mon, 25 Mar 2013 00:03:18 -0700 (PDT); 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?; /archives//html/Amps/2013-03/msg00326.html (6,698 bytes)
2. Re: [Amps] 8650AS Grounded Grid (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Mon, 25 Mar 2013 08:21:06 -0700 (PDT); 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; /archives//html/Amps/2013-03/msg00327.html (7,543 bytes)
3. Re: [Amps] 8650AS Grounded Grid (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Mon, 25 Mar 2013 16:14:17 -0400; 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; /archives//html/Amps/2013-03/msg00330.html (8,703 bytes)
4. Re: [Amps] 8650AS Grounded Grid (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Mon, 25 Mar 2013 13:52:02 -0700 (PDT); The cooler on the GI-7b and GI-7bT come off easily. A metal cooling block could also be made that corresponds with the size of the one on the 8873. Just don't fool around with the BeO2 block! The; /archives//html/Amps/2013-03/msg00331.html (8,216 bytes)
5. Re: [Amps] 8650AS Grounded Grid (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Mon, 25 Mar 2013 19:18:54 -0400; On 3/25/2013 4:52 PM, Glen Zook wrote: The cooler on the GI-7b and GI-7bT come off easily. A metal cooling block could also be made that corresponds with the size of the one on the 8873. Just don't f; /archives//html/Amps/2013-03/msg00332.html (9,305 bytes)
6. Re: [Amps] 8650AS Grounded Grid (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 25 Mar 2013 19:49:21 -0400; Any of the 4X150/250 family can be run cathode driven, but not grounded grid. The control grid is biased and grounded for RF. The benefit is less power wasted in a swamped grid resistor and the drivi; /archives//html/Amps/2013-03/msg00333.html (10,351 bytes)

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