WG6100 focus problem

Hi all, apologies if you've read this already on RGVAC. Basically my
Tempest's WG6100 has a real annoying problem - it's losing focus and
brightness after about 10 minutes. To date I've re-capped it, reflowed ALL
the solder on the HV and Neck boards, I've added tension to the neck board
connectors, replaced ZD902, and swapped in known good MPSA06 transistors
into Q901 and Q902 all with no change :( Can anyone explain what can
cause a failure like this after 10 minutes or so? I'm assuming something
is getting warm and ceasing to function correctly. Another observation I
have made is that I can get the picture back for a short time if I fiddle
with the brightness and focus pots - i.e if I turn them both up full and
then readjust for normal viewing.

As this stage I'm pretty much stumped. If anyone can offer any
help/suggestions I'd greatly appreciate it. Alternativley if anyone has a
working HV box for sale (I'm assuming that's where my problem is) or indeed
a fully working 6100/Amplifone please let me know!

Cheers

Danny.

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Received on Sun Aug 25 15:47:30 2002