3B28 followed the 866 mercury vapors and they were much more hardy. 10 kv
at an amp. I ran a bridge with 4 of the 3B28's with 5500 ac . Johnson 6N2
thunderbold amplifier used (6) 80 mfd caps to handle the 2750 vdc. with a
pair of 866's.
I would change out those old caps and then not worry about failure in the
power supply.
Geo W7LFD
|-----Original Message-----
|From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
|Behalf Of scm
|Sent: Thursday, August 05, 2004 6:09 PM
|To: amps@contesting.com
|Subject: [Amps] bring up an HT 41
|
|
|Hi everybody,
|
|A friend is wanting to put an HT 41 back in service after many
|years of sitting. As best as I can find out on
|the internet it has a pair of 866 rectifier tubes and 6
|electrolytic filter caps.
|
|I'm thinking he needs full line voltage to run the 866s but less
|plate v to try and save the caps. I was
|thinking that he could run the hv primary from a variac for a
|while and the rest of the amp from normal line
|v. Anyone have any ideas?
|
|thanks in advance
|
|73,
|Steve wd0ct
|
|
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