[Amps] K8CU High Voltage Breakdown Tester - A Recommended Modification

[rlm]

On Tuesday, October 14, 2003, at 10:55  AM, Dennis12Amplify at aol.com 
wrote:

>>>> Joe, Skip, Rich, ET. al....,
>
>>>> Please 'critique' the following and see if I am wrong in any of my
> statements.
> > ... ... ...
>
>>>> PS.  I also do not understand the need for the diode bridge across 
>>>> the
> meter if there is always a DC voltage applied to the D. U. T.  from 
> the tester,
> but I'm sure there is some reason for it that is probably way beyond my
> ability to understand.

***   a FWB feeding a DC meter assures that either applied polarity 
will flow in the correct direction through the meter.

>
>  -------------------------------The Original
> Email-----------------------------
>
>
> Hello Jeff, Rich, Skipp Et. al
>
> I have had some experience in this....
>
> After buying a few different russian tubes....(GU-43B, GS-35B, GU-84B,
> GI-6B/7B).
> I've made some tests:
>
> Another GS-35B had 3kv as upper limit, but after cooking it, a 8 kv 
> limit was
>
> reached before a leakage 50 microamps occured!
>
> One of the GU-43's had a 2200 volt limit, but after letting it cook 
> for a
> while,
> it can 'take' 6 kv before leaking.
>
> A copule of GI7Bs had about 1500 v, but after ritual, I think at end, 
> I had
> approx 3900 volts on both...
>
>
> The gadget for these measurements was a K8CU High voltage breakdown 
> tester.
>
> http://www.realhamradio.com/High_Voltage_Breakdown_Tester.htm
>
> -Clipped here again-----
>
> Regards
> /Joe
>
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>
>
Rich Measures, AG6K, 805.386.3734.  www.somis.org/