James wrote:
1. Must all the tubes be in socket to check DC. voltages from
bottom?? Some tubes are deeply burried in chasis and impossible to
measure from bottom. By removing tube and checking pin from top of
chasis - it would be possible to measure volts. Is this OK ?

No. Not at all. You can buy tube extenders that will allow you to measure
this stuff from the top of the chassis, though.

2. I have no VTVM. Can a modern Fluke voltmeter be used ?

Yes, if it has a high enough ohms-per-volt rating.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."