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In Reply to: RE: McIntosh "Samra Style" posted by mr9iron on January 17, 2017 at 01:49:09
I never heard a coupling capacitor that sounds better than those K40Y-9 that Michael recommends.As for preamp tubes I would recommend RCA 12AX7 tall grey plate, Brimar 13D5 for 12AU7 and I have no idea for the 12BH7. Michael also likes the RCA tall plate.
Edits: 01/17/17Follow Ups:
Have you tried Mundorf silver foil caps?
I have tried the Mundroff silver/oil. A slight harshness in the mids & highs. I went back to K40Y-9.
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Hi 9Iron, those pictures topped anything I've seen in Absolute Sound, and I thought they were the best I've seen! If you look closely it looks like the previous owner, unless it was you gave those transformers a (Marine boot spitshine) complete with the snapping buffing rag technique.
Those pointers and arrows are great. I never really saw inside a Mac vacuum tube amp. Thanks for the tutorial look....Mark Korda.....P.S. I think Mike S. had to grab the old spittoon to prevent excessive drooling...
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hey thanks for the kind words and comments, but I learned most everything from the folks off this forum, Mikey is the best, and most everything I have accomplished in tube restorations is due to his help..
.. and yes I was the culprit that polished out the transformers on these, you can see from the other images they arrived all oxidized and plastered with old tape residue....
if you like this post you might also like my Citation II thread, the images are just as good if not better. I had better light to take the shots on that post..
Beautiful amps.Mike rebuilt a Mc240 & a MC275 for me with outstanding results.What did you do to make the chrome look so good?
The chrome is very very tedious to do on the mac or any screen plated chrome surface, as any mis- step will remove the silk screen (the only thing harder is oxidized untreated aluminum, in that case you are SOL and look to have it re- lettered after resurfacing)..
It's a multi-step process that starts with a damp sponge, dish soap, and a couple of nights with a q-tip to avoiding the silk screen. Fist run is Noxin 7, followed by collinite 840 cleaner, and then collinte 845, you can go over the silk screen very lightly with the 845 and a soft cotton rag. You don't really hit those screened areas, you just kind of "cheat it."
The transformers you can do the same way, except instead of noxin 7 use McGuires or any 3000+ cutting compound.
J
When I had a friend rebuild my MC40 monoblocks I got rebuild kits from Jim McShane. It included Russian coupler caps like this unit. So far every other amp that I have put in my system doesn't come near this. Recently added a VTA SP9 preamp and my Altecs have never sounded this good.
BillWojo
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