Interesting new book:

http://www.diyaudio.com/forums/vendors-bazaar/157787-secret-tube-amplifiers-revealed-much-more.html

www.current-drive.info

I know that high output impedance can be a good thing when it comes to creating a good guitar sound, but this book seem to take the discussion to higher level 

What do you think?

Here is a circuit I have found interesting.

It is simply an enhanced version of the classic FMV tone stack but without its weaknesses.

First a standard baxandall bass/treble circuit then a mid control allowing only a mid cut to get "scooped" tone.
The advantages are:
- The pot settings do not depend of each other.
- No signal loss.
- Bass/treble boost and cut can be set.
- A constant Q mid scoop.

The circuit can easily be tweaked to simulate any FMV tone stack.
Q (the bandwidth) can be adjusted with R and the frequency with C.

Hi

I have been testing a few cabinet simulators inspired by:

http://www.herby.kielce.pl/~piter/hexenew2/ie.php?c=cabsims_e&l=diy_e
http://home3.netcarrier.com/~lxh2/

I would also like to add a simulated high impedance output from the driving amp.
I suppose this could be done by adding a notch filter to simulated the impedance curve of the speaker.

Have you guys any experience with these circuits?

Hi from a newcomer

I am glad I found this forum, it has really inspired me with my current project. 
In the 80:s I spent a lot of time designing electronics both professionally and as a music electronics hobbyist. I must say things are much easier now with all the free software available.

Now I am starting a new ss-amp project with the goal to simulate most aspects of a good guitar amplifier:
- a Fender Deluxe cabinet with a Celestion blue
- overdrive/sag
- low/no NFB = hi output impedance
- class A 30W
- line-out/headphones with cabinet simulator

I have gathered very useful info using these links:
http://www.thatraymond.com/downloads/solidstate_guitar_amplifiers_teemu_kyttala_v1.0.pdf
http://www.gmarts.org/index.php?go=210
http://www.blackstoneappliances.com/dist101.html

Best Regards