Ho John,
Congratulations on getting the 575 400V version (575 Mod 122C).
You should search through the archives for advice on bringing up older vacuum tube instruments carefully to allow the electrolytic caps time to reform. That is the most important thing you should do.
The HV circuitry is sensitive to moisture so if the 575 was stored in a damp place you will need to dry the HV parts by baking them, This can be done with a small heater in some kind of enclosure that will retain the heat. It does not have to be very hot (100F to 125F) but you should allow at least a week if you think the HV circuits got damp.
Finally once you feel ready to turn the 575 on use a Variac and bring the voltage up gradually watching the current draw. If you put a lamp bulb in series it will act as an indicator and prevent the 575 from suddenly drawing too much current.
These are some of the tricks of the trade that other members have taught me over the years.
Dennis Tillman W7PF
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-----Original Message-----
From: John Sent: Sunday, June 10, 2018 9:04 AM
I've just bought (but not yet collected) a 575, I think the 400V
option. I suspect it's been stored several years unused. This will be
my first piece of Tek valve kit (apart from a 130). Is there an
informaiton resource for 575's which gives pointers to particular
isues/ problems etc? Am I likely to have any EHT transformer worries?
etc. etc.
Many thanks
John
--
Dennis Tillman W7PF
TekScopes Moderator
