[Amps] 3-500 / 4-400 cooling (09/10/2005)

Tony King - W4ZT amps080605 at w4zt.com
Sat Jan 28 23:17:04 EST 2006


Hi Bill,

The GS-35B wasn't built by Svetlana. It was built in a Union factory in 
Novosibirsk, Russian Siberia.  It's a great tube though!

73, Tony W4ZT
<http://gs35b.com>


Bill Turner wrote:
> ORIGINAL MESSAGE:
> 
> At 07:08 AM 1/28/2006, John E. Cleeve wrote:
> 
>> Bill,
>> I suggest you download from the CQ archives, and read the Bill Orr
>> article, for it states, that the tube pin sleeves, are soldered with
>> 60/40 solder, during manufacture, to ensure the stability of the glass
>> envelope to tungsten lead out wire seal. The melting point of the
>> 60/40 solder is close to, but below that, which would damage the
>> stability of the glass/wire seal, if you use a higher melting point
>> silver solder, you may destroy the integrity of the seal, and ruin an
>> otherwise reclaimable tube.....regards, John. G3JVC.
> 
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> That's very interesting. So the 60/40 solder is used as a sort of 
> thermal fuse to protect the glass/wire seal? Time to change to 
> ceramic tubes, pronto.
> 
> In fact, the GS-35b I ordered arrived today and I got my first look 
> at one. No pins at all and doesn't even need a socket, just a hole in 
> the chassis. Way to go Svetlana! :-)
> 
> 73, Bill W6WRT


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