[Test-Equipment] Another boat anchor -Del Electric High voltage supply?

[Carl]

Sorry, here is the link

http://www.somis.org/BVT.html




----- Original Message ----- 
From: "Carl" <km1h at jeremy.mv.com>
To: "rbethman" <rbethman at comcast.net>; "Discussion of Electronic Test 
Equipment" <test-equipment at mailman.qth.net>
Sent: Friday, November 05, 2010 2:27 PM
Subject: Re: [Test-Equipment] Another boat anchor -Del Electric High voltage 
supply?


>
> ----- Original Message ----- 
> From: "rbethman" <rbethman at comcast.net>
> To: "Discussion of Electronic Test Equipment"
> <test-equipment at mailman.qth.net>
> Cc: "KM1H Carl" <km1h at jeremy.mv.com>
> Sent: Friday, November 05, 2010 12:23 PM
> Subject: Re: [Test-Equipment] Another boat anchor - Del Electric High
> voltage supply?
>
>
>>I do understand high potential testing.
>
> I wonder if you do understand other forms of HV non destructive testing
>
>>
>> When I "look" at the voltage range - and "see" 40 to 50KV on the 
>> metering,
>> even testing to 4 times the plate voltage, would mean that one is using
>> around 5KV in the final.
>>
>> The ONLY place I see that used would be a 3-1000 or 4-1000A final in an
>> amplifier.
>
>
> Those are OK for glass tubes. Others use tubes with handles in those
> converted BCB rigs.
>
> The CBers go even higher and are rather fanatical about hi potting those
> 20-40KW dissipation tubes they buy
>
>
>>
>> I'm NOT going into the 40KV to 50KV range in my shack.  That sort of
>> testing requires an appropriate lab, equipped with a "cage" to retain
>> pieces and parts.
>
>
> Not necessary at least to 40KV otherwise you couldnt use an older TV.  We
> are not talking power here, just voltage at very low current capability 
> from
> the transformer that is further severely current limited. Leakage in a 
> tube
> is measured in microamps. The whole setup fits on a table with the control
> section isolated from the HV with Plexiglass or Lexan so you can also see
> what is going on if necessary. If you get too close your hair will react.
> The transformer can be a 13-14KV neon sign transformer with a doubler. The
> low value filter caps take up most of the room.
>
>
>>
>> I "can" understand 10KV to 16KV.  The old color TVs did indeed go upward
>> to about 30KV.  You had to bypass a fair bit of safety to get near it.
>>
>> Bob - N0DGN
>
> Here is some good reading for the home brewer that has been built by many.
>
> Carl
> KM1H
>
>
>
>
>
>>
>> On 11/5/2010 12:03 PM, Carl wrote:
>>> For AM you want to test to at least 4X the plate voltage; this makes
>>> 10-16KV+  rather a standard part of the test.
>>>
>>> Several megohms as a current limiter protects from tube damage as the
>>> voltage is slowy increased while watching leakage current.
>>>
>>> Carl
>>> KM1H
>>
>
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