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In Reply to: RE: recapping my amps... posted by gkargreen on November 13, 2014 at 19:37:31
Sometimes your better off just leaving well enough alone. If your 299A works and sounds good to you, maybe you should just replace the four original .1 couplers, the caps that could cause the most problems if they go leaky or bad.The Russian K40 pio's sound good in my 299A and MC225 and Gudeman .1 pio replacing the .068's in my Sherwood S5000 sound good so they are now a known safe choice for me as couplers.
Other than the high and low voltage supply caps and the LV rectifier, changing to many other caps may or may not be to your liking.
Years ago I replaced most of the small caps in my 299A and found myself replacing them with NOS 1960's caps until it sounded good to me again because I couldn't find a combo of new caps that sounded good to me.
But that's me.Those brown package radial lead metalized Xicons have lots of snap and zing but they can be bright or harsh. I had them in my 299A for a while but the K40's proved to be as open and lively without the edge.
Check out Mikeys recent S5000 post. There are now two pics of a Sherwood S5000 rebuild reflecting two ways to go in a rebuild.
Edits: 11/13/14 11/13/14 11/13/14Follow Ups:
thanks, Dave, solid advice! I did replace the couplers with K42y's I had on hand, as I brought it up I was getting a lot of noise from the 6BL8's, turns out it was the pyramids leaking as replacing them totally cleared up the noise issue (sounded like fat frying in a hot pan), so I am somewhat thinking that the other pyramids may also be going bad, I believe someone here mentioned them as not very good caps. Also, I have heard conflicting info on the ceracaps, some say replace, others say not....
I had the intermittent frying sound too and it went away after I replaced the .02's on the preamp 12AX7's so I thought I was done with that issue.
Then it came back and it turned out to be a 12AX7 tube socket connection.
Moving the tube around in the socket stopped it but I never got to the bottom of it because my Sherwood arrived and I'm focusing on that right now.
I know what you mean about the varied opinions of old caps.
My new tactic is to replace the supply caps,rectifier and coupling caps then if I think there's still something that might be better, I change a pair of caps at a time, the same one in each channel to see what sonic change that makes.
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