I am in the process of reading all 52 pages about the OTS, HRM's and the many versions.

I have noticed that mods from forum members have been offered and it seems to improve the amps.

I don't do my own wiring but when I order the amp, I would like it to have the necessary mods/upgrades so that I don't have to keep running to a tech every week.

So far I favor an HRM Skyliner II but unsure if it should be a 50 or 100.


These are the mods that I have seen so far, and would like anyone's opinion as to whether these should be done to the amp from the start by Nik, please.

use a 1n capacitor in series with a 150k resistor soldered to OD master pot in and ground. This trims off the fizzy highs in my HRM amp.

would adding a treble bleeder after the HRM tone stack smooth out the treble

power scaling?

LNFB mod. (lift negative feedback) toggle switch? What does this do?

Get the cathode bypass switch installed to explore the saggy side with less fuss

What will this mod do? Change the slope resistor from 150K to 82K; I removed the 22pF snubber from V2a and I increased the snubber on V2b to 700pF to end fizziness.
 
What is "resistor with choke switch mode" on HRM?
 
Can variable pot or three way toggle be added to amp to tame the bypassed second channel
EQ and maintain equal volumes when the tone stack is bypassed on second channel of HRM?
 
Can the amp be made to have power tube saturation if desired?

Before I email Nik, since these mods came from forum embers, I was interested to know if I should add these to a build from Nik.

Also, would some of these mods only need to be done on an OTS, rather then an HRM?

Thank you to the forum for any help you might be able to offer.  I am really confused and frustrated by everything involved with these amps so far.  I just don't know where to begin.