On Monday, January 21, 2019 at 10:20:31 AM UTC-5, Ralph Mowery wrote:
In article ,
says...

I was always under the impression that film resistors are identical
(electrically), and their only difference is appearance. Now I learn
that is not true.....

WHY?????

So IIUC he changes the R value and it no longer oscillates. Presumably he's thereby changed the loop gain. Where is the surprise?




Could it have been possiable that the new resistor was bad, or maybe the
color code was read wrong so the wrong value was put in ?

Prob not "bad", but maybe just way off value (or read incorrectly as you surmised). I've been given tons of old parts including resistor assortments. You can't believe how often the wrong resistor (usually multiplier) was in the wrong drawer.

When sorting new old stock carbon carbon comp resistors, I don't sort them by printed value, but actual measured resistance since so many of them are closer to the next value up or down than they are to their own printed value. I only keep them to put in old tube radios for authenticity's sake.