[Amps] GS35B Gassy, or Arcing?

[Alek Petkovic]

Yeah and write to Dr Alex and buy another GS35B. They are cheap as chips 
and you might get a better one.

73, Alek
VK6APK

On 27/02/2015 8:26 AM, Carl wrote:
> 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
>>>>
>>>
>>>
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 2015.0.5751 / Virus Database: 4299/9184 - Release Date: 
>> 02/26/15
>>
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>

-- 
 From sunny Binningup, Western Australia.