A while ago I got an offer I couldn't refuse for my good TO-6, so I sold it
because I didn't need it at the time and I knew I could find another. Well
I found two that looked like they had been thru the mill, but for $10.00 for
the pair I took them. One works reasonably well, while the other has more
problems. I needed to test and reform some caps and saw differnt results on
each. After opening them up I could see both had been worked on by the
inept because of the poor solder joints. I touched those up but still had
problems. Luckily I found a copy of a copy of the manual. Several
resistors had been replaced with ones close in value, a 100K was used where
a 47K was indicated, a 1.8 megohm had a jumper across it and one 1200 ohm
resistor had dropped to 33 ohms! After replacing all of the qestionable
parts I could see that both units had different problems and so I started
tracing the circuits. In my manual copy the bottom view of the chassis has
two reisistors as R19 and I'm sure the left R19 is supposed to be R17.
There's also two resistors identified as R16. I'm relatively certain that
the upper R16 is correct at 25K. I'm not sure what the lower R16 is
supposed to be becasue in its place I have 15K in one unit and 75K in the
other, both appear to be inept replacments.
If someone with one of the TO-6s and a manual could take a look and tell
me if their manual has been correct, I'd like to know what the lower R16 is
supposed to be and what value.
tnx
hank wd5jfr