OK here are some pics of my internal/external mod:
I can safely say I can place this baby next to any amp and it will hold it's own in quality sound.
All areas of sound are now top notch.(detailing/depth/dimensionality/realism/micro¯o dynamics)
The only weakness was in blasting.
Like my 20ohm HEKV2, it did so, but did run out of gas at a earbleed levels of end game power.
I was still able to shake them good and with other cans it did have authoritive power.
I atribute this to the 1000uf cathode caps as suggested by member "Kryl0071".
As I am nit-picking here , I would say channel separation is not at endgame level,
I believe due to using one tube a driver for both channels..
This applies to every amp like this in my opinion.
Still very good but probably 95℅ of what it can be.
It is not fair for me to compare it to a "balanced" OTL & OCL tube amp,
But it still is quite impressive considering this amp is less than $200,
and the upgrade was $134 in parts ..
So for about $330 total plus some soldering you get near top level sound!
Can you show us the soldering points you did on the other side of the board please?
I am trying to do the same mod as you
Below is the pictures of my board. Looks like i have version 1 board
Edited by jekjek - 3/20/17 at 4:53pm