[Amps] GS35B Gassy, or Arcing?

[Carl]

Run the tube at RF at half the arc over voltage and it may last a long time 
and even improve.
Thats still a decent signal.

Carl
KM1H



----- Original Message ----- 
From: "Mike Waters" <mikewate at gmail.com>
To: "nemo zilch" <nemozilch at gmail.com>
Cc: <amps at contesting.com>
Sent: Thursday, February 26, 2015 3:30 PM
Subject: Re: [Amps] GS35B Gassy, or Arcing?


>I went back and read more of that page after I got more fully awake. Forget
> what I said about the 3800 volts for now.
>
> Sometimes, high voltage applied to a tube, BUT with more current behind it
> than you've applied, causes a one-time arc that clears a tiny bit of 
> debris
> that got in during manufacture. I've personally seen that happen with some
> 572Bs in my SB-200.
>
> In my case, I added a 10-20 ohm glitch resistor and AGC 1 glass fuse in
> series with the HV anode supply. The first time (IIRC) that I powered up
> the amp, the fuse blew. When I replaced the fuse, the amp could be used.
>
> That fuse blew two other times, but has never blown since (in over two
> years.)
>
> You never know unless you try, :-)
>
> 73, Mike
> www.w0btu.com
>
>
> On Thu, Feb 26, 2015 at 2:04 PM, Mike Waters <mikewate at gmail.com> wrote:
>
>> Sounds like you received some other info off the list.
>>
>> I have a wild hunch. What happens if you don't leave the grid floating?
>> Try the hi-pot test with the grid connected to the cathode.
>>
>> And did you try this again with the filament lit?
>>
>> In your OP you said you wanted to run it at 3800 volts. It's been awhile
>> since I researched that tube, but isn't that kind of high for the GS-35B?
>> http://www.gs35b.com/gs35b/
>>
>> 73, Mike
>> www.w0btu.com
>>
>> On Thu, Feb 26, 2015 at 1:34 PM, nemo zilch <nemozilch at gmail.com> wrote:
>>
>>> OK gang.  I think the collective wisdom of the group is that my tube has
>>> more than average gas and that operating it with plate power is not 
>>> likely
>>> to help due to the location of the getter.  So, guess I just lost out in
>>> the Russian tube sweepstakes.  Well, I went in with my eyes open, so 
>>> I'll
>>> take my medicine.
>>>
>>> I am going to run it with plate voltage and current, probably can get
>>> nearly 1500 Watts into it.  If that  makes any improvement, I'll let you
>>> all know.
>>>
>>> Thanks everyone for the advice, I really appreciate it.
>>> Bob W4AOS
>>>
>>
>>
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