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Hm,

since I made my last post I was walking around my room, listing music and a feeling that something was very  still wrong did not live me. It always there was some sense of presence of HF in sound. It was not my typical full-Sound where it is imposable to say if it was enough "frequencies" but it was some kind of Sound + the "frequencies". I tested the  1st stage HF tube. It was fine but I still replaced it. I tested and juts in case replaced the output tube, even tryed thefew different brands of them but the problem did not go away.

Then I said: “OK screw all theory!” I opened the amps and replaced the coupling cap from .047uF  to 2uF. O wonder! It fixed the problem immediately. Then I trued few more caps in there and I learned that when the larger caps were placing between the stages I got the WAY better HF integration . Pretty much anything over .68uF worked very well. I would like to remind that the HF channel works from 3.700Hz electrically....

This all settles down a very important conclusion that for HF channel of multi-amping the presents of the modulative LF harmonics is incredibly important and apparently the HF channel amplifiers MUST run full range.

The 2uF-coupling cup was permanently placed to the place what it should be.

I hope the time I spend to learnt this make some of you to think then you do your multi-amping…

Rgs,
Romy

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