On Sun, 05 May 2013 15:53:24 -0400, Archon
wrote:

On 5/5/2013 3:21 AM, N_Cook wrote:
With about half mains voltage , for a bit of personal safety. About 20V over
C-E of one driver Q and 120V over C-E of the other, whenever powered up.
Plan of campaign will be to try biasing on the off one and see what happens.
Could a leaky driver transistor be the most likely cause of non-oscillation?
one sliver-mica cap could have metal migration , others are polyester and
ceramic. Otherwise loads of diodes and coils.


Just scanning the info on Yahoo Tek scopes, the batteries need to be in
situ as part of the regulation on these, bad things may happen
otherwise? (so they say, no experience with them myself) JC


The batteries do need to be in the circuit and they can't be
completely dead, or the scope won't function, even when hooked up to
AC. Chuck