Threshold 400a factory upgrades in the 80’s

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I’m old and forgetful

You are totally right. I'm just old and forgetful.

If you look at the photo, you can clearly see that the output of the amplifier
comes from the cases of the TO-3 devices, which was true only of the
later Stasis circuits. Further, 1 ohm resistors were never used on 400A's.

Clearly it was updated.

Hi Mr. Pass
The last thing I would say is that you are old and forgetful, more like your mind is cluttered with ideas for new amplifier designs that have yet to come out.
Can’t for what tou will come up next!
Well maybe your getting a tad old but I bet I am older.
 
nice find
 

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