The Amp Garage

Going over the rectifiers max spec can shorten its lifespan. People do it all the time but better to stay within limits. MOD and nichicon make 40uf caps. This only applies to the first cap off the rectifier, you can go higher with others. Thanks for this. I might have some caps in that range. Antiq...

...Crackling could be a sign of rectifier tube failure. And there it is. (Maybe..) I've thought about a SS rectifier just because 6x4 aren't very common, nor are the substitutes, and that socket is a bowl of ramen. Full-wave bridge rectifiers are cheap and abundant. Well, easy enough to pursue this...

Question: What happens when PS filter cap's capacitance rating is too high? Background: O'Neal's guide to the KM2 suggested increasing the PS filter cap from a 10/10/20 to 20/30/40, also suggesting 40uF was a maximum according to RCA 6x4 rectifier tube specs. Closest I could find were 22/30/47 F&T 4...

1) Remove all the tubes and with a needle nose squeeze all the tube pin receivers together from the bottom side of the socket so they grip better. Did that awhile back and I've checked a couple more times since. 2) Many of those terminal strips use there mounting legs as grounds and the ground conn...

Noise getting louder with the gain pot usually indicates a problem before the pot. That's what I thought, and is why I started at that end of things. Ended up replacing all the passive components. Updated photos, after your most recent changes, would help. Hope so! https://photos.smugmug.com/Projec...

Did you replace the cap or just flip it? Could be damaged. New cap. Other direction. Was magic for awhile. ... photos of your amp might be helpful. Pretty much as it came from factory, except for grounded AC main I installed decades ago: https://photos.smugmug.com/Projects/Kalamazoo-/i-pgL3Hq2/0/L7...

Last fall I dug out my mid-sixties Kalamazoo Model 2 and set about bringing it back to life. First project of this kind, so I replaced all the caps, tubes, and speaker with quality modern ones and it worked great. After some hours of use, it developed some unpleasant highs that fixed with correcting...