Re: G05 HV troubles

Andrew;
Did you check/replace D904 leading to the anode cup?
I had a R901 cooking and found that to be the culprit.
Jeff

On 8/23/2013 4:56 AM, Andrew Welburn wrote:
> hi all..
>
> I've been fighting with a HV box from hell recently, and i've held
> off posting to vectorlist until i was really stuck. I'm at that point
> now.
>
> Its a G05-802...
>
> Right now, R901 is smoking up. I'm only getting 7.2kv at the anode,
> and the HV adjust pot does not change the hv. I can only have it
> running for 10 seconds before R901 really starts to cook off.
>
> The flyback was actually bad, as the HV was bouncing around from
> nothing up to 7kv very erratically before, so i swapped that from a
> known-good v2000 hv box. Now i get a steady HV, albeit low and r901
> still burning up. (R901 was cooked crispy before the flyback swap anyway)
>
> I have subsequently swapped _every_ diode and transistors in the box,
> and it still acts the same, no improvements. I also changed the
> electrolytics, and the HV adjust pot itself (R905).
>
> Can anyone think of a scenario that would let R901 burn up? any
> pointers as to where i should be looking harder?
>
> thanks..
>

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Received on Fri Aug 23 08:16:11 2013