[Milsurplus] Re: [ARC5] BC-348 Dynamotor Temp.
Unserviceable but Repairable
cosmoline at aa4rm.ba-watch.org
Tue Apr 15 17:10:38 EDT 2008
Dennis, yo
Fast check - see if dyno delivering rated output. If not, mebbe vy
bad bypass. Here's how to find it.
Tube filaments in groups of four. One group has 6K6/41 output plus
3 more. Pull output. You'll have to look @ schemat. to pinpoint
remaining four tubes & then pull one of the group
Why do this? To see if there's a bum B+ bypass when no current pulled
by tubes.
So run up dyno & measure if any voltage drop across B- series resistor
(bias for output stage)
If if voltage drop, find the trouble cap.
Brought a '224 back this way 2 mo.s ago... but no dyno - used external
B+ supply.
Now motors today often rated for 55C temp. rise. Think that's 'way
more than dynos did.
'rm
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