On Thu, 17 Jun 2004 02:39:33 GMT, 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 ?

Some voltages will be absent or greatly changed with the tube
out-of-socket. To measure tube voltages from above the chassis with
the tube in place use tube socket test adaptors. I haven't seen any of
these for sale at a supplier or in a catalog in years, but they show
up on eBay and at antique radio meets and hamfests. Most of mine are
Pomona which I bought new many years ago. I like the Pomona adaptors
because you can easily connect mini-clips to their terminals.

Dale H. Cook, Chief Engineer, WWWR Roanoke VA, WCQV Moneta VA, WKBA
WZZI Vinton VA, WKPA WLNI WZZU Lynchburg VA, WMNA/WMNA-FM Gretna VA
http://members.cox.net/dalehcook/starcity.shtml