[Amps] Russian Power Tubes

[David H Craig]

    Russian (USSR) specs are not the same as Eimac or other hi-quality 
manufacturers.  There is, for example, not even a published figure on 
cathode input impedance.  That said, stick to your sheet specs and build a 
GS35b with 3kv on it- you won't get the performance you expect.  As for me, 
I'll stick with 4400v, which is 146% out of rating.  BTW, there sure are a 
lot of "out of spec" GS35b amps out there.  Must be Communist tube quality 
control.
73 Dave N3DB



> On Tue, 15 Dec 2009 21:22:38 -0500, "David H Craig" 
> <davidhcraig at verizon.net>
> wrote:
>
>>        I guess empircal evidence isn't germain to this discussion.... 
>> must
>>be flat-earth "theory."    I have some PE friemds that run close to 5KV on
>>the plate of a pair of GS35Bs on 50 MHz... again. I assume it irrelevant 
>>to
>>the "theory" gods.
>>        Dave N3DB
>
> REPLY:
>
> You are right, it is not relevant and I'll tell you why.
>
> Manufacturers often make production runs of a particular part which can 
> and do
> vary slightly from one run to another.  Just because one run of a part 
> will
> withstand say, 133% overvoltage, does not mean the next run will, even 
> though
> all parts meet specs. Wise designers know this and stick to the specs.
>
> 73, Bill W6WRT
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