On Diodes, Tubes and Compression

[silverfox]

Okay, maybe starts some trouble here. Don't know but here goes...

On the Mesa Boogie MKII I noticed the other day from a post here regarding building one, I noticed there are constant current diodes on the cathodes of the preamp tubes. These ostensibly were placed there as a constant current source for the Fetron optional plug in in the V1 position.



It appears from others research that the diodes are also having a compression effect on the tone even when the Fetron is not used and this effect may be reproduced using various other diodes such as the 914 and even 4007's with variations on the tones obtained.

Is this a viable mod for some of the amps designed here? D'MoSo 56 or D-MarsOD ?

[super&plexi]

I owned a MKIIb, late 70s? 80's? probably 80's. not my favorite amp by a long stretch.

 clean was passable, not a fan of dirty channel . ran boxes for dirt. not sure if same amp. IIc+ was/is the bomb....difference between b, and c+.........missed it by that much!.

simul class, whatever, worlds apart!. my 2bits. Are these amps from 2 different periods?. have they re-released?.