[Amps] Tube suggestion needed - 6 and/or 2M ~500W level with800-1kv on plate?

[n8de at thepoint.net]

Find a used SB-230 and convert it.
Should be quite easy to change output circuitry.
NO, you can't have my SB-230, unless you buy the SB-104 and all the  
other matching boxes.
Don
N8DE

Quoting david feldman <wb0gaz at hotmail.com>:

>
> To take it back to the original interest - can the GLA1000 in this   
> case be used as a mule to build a portable tube-based 6M amp (2M was  
>  something of an afterthought when I made the posting) of middling   
> power level consistent with it's power supply. For this purpose,   
> tubes are preferred over solid state, small is important, and   
> self-contained is important. The GLA1000 is on hand, and from a   
> project perspective, it seems interesting to me. What I've gathered   
> so far is that there are probably no clearly-suitable tubes as a   
> starting point (the 1KV plate voltage being the main barrier), and   
> most likely the project will go no further (SB-200's converted to 6M  
>  are common enough and although a little larger, wouldn't have the   
> new-design engineering challenges.)
>
> Thanks to everyone for the various insightful suggestions and discussion!
>
> Dave
>
>> Subject: RE: [Amps] Tube suggestion needed - 6 and/or 2M ~500W   
>> level with800-1kv on plate?
>> Date: Sat, 21 Jun 2008 14:20:20 -0400
>> From: hmandel at barantelecom.com
>> To: km1h at jeremy.mv.com; wb0gaz at hotmail.com; amps at contesting.com
>>
>> {snip}
>> One idea Ive not tried is to take a regular 4CX250B and remove the
>> radiator (they are soldered on) and then make up your own solid block.
>> Or saw off one side of fins and replace with a brass plate. Then mount a
>> muffin fan on top of the cabinet to draw out some heat thru the
>> remaining fins while another fan blows on the heat sink.
>> {snip}
>>
>> Doesn't all this sound cost-inefficient, somewhat?
>>
>> Are you in desperate straits to get this particular
>> machine configured with so irregular a design?
>>
>> My next question is directed towards the
>> RF Circulating Current model, as yet-unbuilt,
>> that extensive modifications in an untried
>> cavity will produce......
>>
>> However, science for the benefit of learning
>> is fruitful at any expense.
>>
>> "The operation was a success, but the patient died."
>>
>> Good hunting, "hals und beinbruch!"
>>
>> Harold Mandel
>> W4HBM
>
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