[Johnson] 10 watt audio amplifier

[Robert Nickels]

A strange but happy ending!  Thanks to a schematic scan provided by a 
list member, I was able to confirm what I thought - the extra windings 
were for the bias supply.    I've become overly cautious when 
powering-up a new device and after recapping this amplifier last night I 
did the perfunctory ohmmeter checks on the transformer windings, only to 
find one half of the HV secondary measured open circuit.   Verified with 
a different meter, then posted my note for assistance and called it a 
night, expecting an expensive rewind job lay ahead.

Today after verifying the connections were correct I went ahead and 
applied power with the rectifier tube removed and what do you know?   
Full voltage on both sides of the secondary!  Rectifier in, full HV and 
good clean waveforms thru the audio chain.

Evidently some internal connection in the transformer was "open" to 
ohmmeter voltage but healed itself when several hundred volts was 
present.  Can't say I've ever seen this before but very happy the 
transformer seems OK.   I've had the 10 Watt Audio Amplifier for many 
years, telling people it was "bait" for attracting a Desk KW. Well, now 
that the bait worked it would be a shame not to be able to put it to 
use, especially after spending inordinate time restoring and aligning a 
Pacemaker.   Thanks for the assistance.

73, Bob W9RAN