[Amps] Hi Pot Test Procedure?

[Carl]

I have a commercial Hi-pot that goes to 5KV and a HB one goes to 13.5KV.

Its a bit annoying to compare glass Chinese TX tubes against US versions and 
see how poorly they fare and its no wonder they are notorious for arcing. Im 
talking about the common 811A, 572B, and 3-500.

Every Chinese tube I get from Ameritron and RF Parts gets a complete test 
before installing in a customers amp and some are bad right out of the box, 
prior testing not withstanding...

Carl
KM1H


----- Original Message ----- 
From: "Gary K9GS" <garyk9gs at wi.rr.com>
To: <amps at contesting.com>
Sent: Monday, February 13, 2012 7:29 PM
Subject: Re: [Amps] Hi Pot Test Procedure?


> Thanks for the reply Brad.
>
> I took the tubes into the office today.  The hi-pot tester there only
> went to 5kV.  It was so fast to test I ended up going between the anode
> and each tube element.  No problems on either tube although the tech
> that was watching me was fascinated by the tube.
>
> He's never seen a vacuum tube before except in text books, much less one
> not made of glass or one that big.  When he asked about the voltages
> normally applied (I showed him a spec sheet) his eyes got really big and
> I got the "you're nuts" look :))  When I applied the HV he backed away
> saying he's never cranked the hi-pot to 5kV before :))
>
> Kinda made my day.............
>
> On 2/12/2012 7:51 PM, B Osburn wrote:
>> Since you are just checking the integrity of the vacuum I just did anode 
>> to cathode.  RLM may say different.
>> Brad AB0YD
>>    ----- Original Message -----
>>    From: Gary K9GS<mailto:garyk9gs at wi.rr.com>
>>    To: AMPS Mailing List<mailto:amps at contesting.com>
>>    Sent: Sunday, February 12, 2012 6:09 PM
>>    Subject: [Amps] Hi Pot Test Procedure?
>>
>>
>>    What is the proper procedure for Hi-Pot testing a tetrode, in this 
>> case
>>    a GU74B?
>>
>>    Apply potential between anode and any other element?  I did see one
>>    mention of applying potential between the anode and the nearest grid 
>> but
>>    is this correct?
>>
>>
>>    --
>>
>>
>>    73,
>>
>>    Gary K9GS
>>
>>    Check out K9NS on the web:  http://www.k9ns.com<http://www.k9ns.com/>
>>    Greater Milwaukee DX Association: 
>> http://www.gmdxa.org<http://www.gmdxa.org/>
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>
> -- 
>
>
> 73,
>
> Gary K9GS
>
> Check out K9NS on the web:  http://www.k9ns.com
> Greater Milwaukee DX Association: http://www.gmdxa.org
> Society of Midwest Contesters: http://www.w9smc.com
>
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