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In Reply to: RE: Confusion at MX110 12AX7 tube results posted by Michael Samra on December 29, 2016 at 23:17:17
Ok so here's some pics.There was a failure of half the filter cap at the back next to the transformer (paper covering on it) and is now aided by a capacitor inside the amp (I believe you will understand and see what that is.
Also another filter multi cap died (the one in the middle) and that was replaced with a Mallory in that position.
Other than that I am hearing a loss of smoothness on the top somehow. I am using an EAR 834 now into the MC240 (McShane and your mod) and it sounds fuller than the once fuller sounding MX110 phono section. I am at a loss...
Did they do something wrong at the shop? Apparently they know what they are doing but have no considerations usually for audiophile tendencies. (all mods are considered idiotic by them)...
Have a look...
Paul
Edits: 12/30/16Follow Ups:
My first love was mx 110 mcintosh ,my first tube adventure .
i love it and was my reference for years (i was 30).
I tried everything in there ,but i've always found Ge 7025
and 6201 ge do the trick ;balance between air ,smoothness and
transient attack;they must be well balanced and selected ,
don't use 5751.
Even the tubes in the tuner section influnced the phono sound
(i used sovtek 6au6)
6d10 must be a well selected ge (i remenber i had a bu nch of these
hearing a lot of difference between nos tubes )
Final 12at 7 (cathode follower )make a huge difference too(6201
ge ;my last one was a 12at7wc Tfk marked,Ge production )
Great pre for jazz (never heard miles and chet like this)
I love that sinto-pre
Enjoy(and try to avoid new production tubes in it)
It looks good underneath but can you shoot a photo of the top side cans?
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
I believe I added those three pics afterwards! Check to see them and please let me know if I'm alright here.
Thank you Michael!
Paul
Just as I thought..Those cans are original and they need to be replaced with quad 50s at 500v.It is hard to put in tons of extra capacitance in those other than for the filament circuit which I use a pair of 4700uf at 35v which is perfect..You need a pair of quad 50s at 500v and a pair 4700uf at 35v and the one for the cardboard cap may have been changed from what I see.Also,put Schotky diodes in the thing and if you do this stuff,you will adore your preamp again.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 01/01/17
That's better news!
The cardboard cap is original. Apparently half of it died and leaked so that's the reason for the extra cap underneath.
Would it be possible to get a list according to schematic of what to get and by what company (keeping the original sound please) of cap?
You mentioned and where your recommended diodes go?
Thanks for this!!!
Paul
Paul
The cardboard cap has to go as well but I didn't mention it as I wasn't sure it was replaced underneath and glued in.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
So that's three cap cans. Is it possible to get a small parts list and what to do for this so I may order it?
My email is paul.kehayas@gmail.com
I thank you for all the attention and help!
Paul
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