Quote:
Originally Posted by bandersen
They are coupling caps and should not significantly affect the alignment. After finding bad ones in several 630TS, and 721TS sets I started replacing them more aggressively.
Those 1500pF caps are ceramic and very reliable. I'm surprised you needed to replace them.
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the set spent many years in musty damp basement before I got it, even after replacing the 150 ohm resistors on the IF string, (they were way out of tol) I was still having trouble getting the +135 to make it to the far end of the string to the 1st if and tuner, so i changed out the 1500pf caps, that brought up the bias significantly, I did not at the time, have a way to test them for leakage.
And as mentioned, the Mica ones are still in there.
