Dokert
Well-known member
I was given this 4900 that someone did a very nice high temp cap kit on, because it was all green.
Well, it really wasn't green. There was no blue and very little red. All adjustments on the neck board lead to more or less green.
Hmmm, where have I heard this sad story before? Here is what she looks like...

Time to break out the trusty B&K 490 rejuvenator. Here is what she looks like now...

Just for those who are confused by color bars...

Moral of the story... If you just did a cap kit and the adjustment pots on the neck board make no difference in colors, you may want to rejuv your tube before changing out the color drive transistors.
Dok
Well, it really wasn't green. There was no blue and very little red. All adjustments on the neck board lead to more or less green.
Hmmm, where have I heard this sad story before? Here is what she looks like...

Time to break out the trusty B&K 490 rejuvenator. Here is what she looks like now...

Just for those who are confused by color bars...

Moral of the story... If you just did a cap kit and the adjustment pots on the neck board make no difference in colors, you may want to rejuv your tube before changing out the color drive transistors.
Dok
