Marshall Depth Mod (adapted from SLO) varify?

[flemingmras]

Oh no I just wanted to make sure you knew that I was one of the ones who's already done his "book reading".

There's only one book concerning tube amps, what's worth to be read - but unfortunately its release will be first in about ten years! Guess what will be the author's name

Boah - that was snotty now

Larry

Let me guess...all that book will teach anyone is to go out, get some books, and read them before they touch a tube amp right?

[novosibir]

Let me guess...all that book will teach anyone is to go out, get some books, and read them before they touch a tube amp right?

Or maybe I go and found my own Tube Amp Builder's School, where the guys only get a script for each lesson *haha*
Be my guest!

Larry

[joey]

Well I hate to make you feel bad for typing all that but I totally meant that comment "tongue in cheek" (i.e. sarcasm). Hence the smilies.

No, no! Don't get me wrong!

I don't feel bad, quite the contrary! I rather think, that this once had to be written here, because I'm convinced, that most of the forumites even haven't thought about these interrelations within power stages and moreover I'm even so brash now and claim, that "not only a few" of those countless boutique amp builders don't know this - just are wondering, why the new design is flat & lifeless sounding, squealing, motorboating, breathing, harsh in the highs w/ static noises and some other funny appearances and don't know, where exactly to check and what to do...

... already have had 'the one or the other' boutique amp on my bench, so I know, about what I'm speaking

Larry

Larry,
This whole thing is an on going inside Joke Flemingmras and I have going on, he was joking around and hinting that it seems that more and more people want others to do the work for them, instead of learn, with this in mind I truly hope somebody learns from the time you put into witting that Larry.

Yes it is true that many people, hobbyist, and professional builders, even major companies do not take into account how many phase shifts are enclosed within the -FB loops, and just blindly apply what ever amount of feedback they feel like using. You touched on the major aspects of it. while it is true that the less amount of phase shifts that occur in the loop the better, and to keep in mind how far apart each shift is, it is also important to note that there are ways to fix this in existing designs. usually this is done by taking the lowest -3db point for the lowpass', and the highest for the highs, and shifting that point to make them even further apart from the others.

as for the blocking cap, it's not necessary if it is global resonance, but if you made it switchable you might want it.

EDIT: Goddamn it, I hate it when others type faster than I do

[flemingmras]

Well I hate to make you feel bad for typing all that but I totally meant that comment "tongue in cheek" (i.e. sarcasm). Hence the smilies.

No, no! Don't get me wrong!

I don't feel bad, quite the contrary! I rather think, that this once had to be written here, because I'm convinced, that most of the forumites even haven't thought about these interrelations within power stages and moreover I'm even so brash now and claim, that "not only a few" of those countless boutique amp builders don't know this - just are wondering, why the new design is flat & lifeless sounding, squealing, motorboating, breathing, harsh in the highs w/ static noises and some other funny appearances and don't know, where exactly to check and what to do...

... already have had 'the one or the other' boutique amp on my bench, so I know, about what I'm speaking

Larry

Larry,
This whole thing is an on going inside Joke Flemingmras and I have going on, he was joking around and hinting that it seems that more and more people want others to do the work for them, instead of learn, with this in mind I truly hope somebody learns from the time you put into witting that Larry.

Yes it is true that many people, hobbyist, and professional builders, even major companies do not take into account how many phase shifts are enclosed within the -FB loops, and just blindly apply what ever amount of feedback they feel like using. You touched on the major aspects of it. while it is true that the less amount of phase shifts that occur in the loop the better, and to keep in mind how far apart each shift is, it is also important to note that there are ways to fix this in existing designs. usually this is done by taking the lowest -3db point for the highpass', and the highest for the lows, and shifting that point to make them even further apart from the others.

as for the blocking cap, it's not necessary if it is global resonance, but if you made it switchable you might want it.

EDIT: Goddamn it, I hate it when others type faster than I do

Joey...I hereby grant you permission to use my real name around these here parts. I seriously need a screen name change.