I feel much better now reading that Jeff says
"It comes as a complete surprise to me that changing one capacitor or resistor in the circuit of the MX110s makes as much difference as I hear when swapping between entire components like preamplifiers or amplifiers in my hi-fi systems".
It is nice to have someone say the same thing as I have been saying indicating it is true or we are both crazy!
My one Fisher is back with 4 changed coupling caps, one new resistor, 4 power tubes now the new Tungsol vs. EH 7591 and changed to fixed bias from cathode bias.
My repair guy did not know if I would be able to tell the difference? (for real)
I do not even recognize the amp!!! If you said to me it was a totally different component that would be MUCH more believable.
In the past I would have been quite upset!
The amp was loaded with Jupiter, Jensen Copper Paper tube and VCap Cuft caps. It sounded absolutely awesome! However it has had running issues...
More or less this amp was left over parts not making main amp which is all Duelund with Jupiter in phono stage.
The 4 caps are Solen caps. The repair guy knew I would not stick with them. They are rated around 6 is my guess by Tony Gee.
The caps that came out Jupiter rated 13 or Jensen (not rated) but in my guess 12 or more.
In in most of my years of testing it has been a cap at a time test.
This kind of a change is just not doable... It is just so far from where it was one can not reference.
My guess is the tubes are just a tiny change. I have changed tubes and yes some are better than others but a tube difference does not equal a cap change. (Possible the different resistor)