"Chris F." wrote in message
...




If all else fails, trace out the schematic. It doesn't look all that
messy and you can probably use the DG-9 schematic as a guide. The
author of the web site where we found the DG-9 schematic is the
founders son. Send him email asking if he has a DG-7 schematic or if
he knowns anyone that can help.

I might do that. Can't think of anything else it might be, as it's really
a rather basic circuit. BTW that small tube with the 2 leads I mentioned
is a 5841 (voltage regulator), and I don't have a sub for it.


Check this out:

http://www.dvq.com/geiger/heath_rc1.pdf

Googleing says it is a 900 volt regulator. maybe a stack of 150 volt zeners
would work.

I did see some replacements available.