How to convert Class A/B amp to pure Class A

Find out how to adjust the bias.

There is a guy named John "something" I believe which is in california, or was a couple years back that was a threshold designer, and he would convert all these amps to pure class A for a small fee.. He would replace some power supply stuff like rectifiers, and up the beef on the caps etc… and do it with newer parts and reliability.

He did all the fortes as well and highly recommended going class A if you can.. I owned a sweet little forte that was mint and got stupid selling it due to moving out of a place and not having a system for a while, but well worth it.. Look up "Threshold Repair services" on google or something and you should be able to find him and his small mod company if its still around, I am sorry I just don't remember all the details.

He can do a bunch of mods to these things, and a big one if I remember correcly is actually removing those out of date monster caps by replacing them with custom boards that actually takes many smaller caps that are faster, higher end, and more reliable, basically taking banks of good new caps and upping the capacity of the values as well as adding several more for higher current, faster, sweeter, more reliable sound.

Of course who knows today, doinga all this at a price you might just by some new Class A mono's and be done with it! At least contacting him he could maybe give you the basic rundown if its possible to do yourself with the existing design.

I believe the guy Undertow is referring to is Jon Soderberg of Vintage Amp Repair who used to be an engineer at Threshold.