Teemuk. Question.

[metalhead]

What about that book you wrote. Is  it allready available somewhere? Pdf file?...to be found where?Lookin forward to that.
Is it possible that you would share some thoughts about Pritchards designs (i Know that they are beyond the scope of DIY Forum-if this is such) but the Amps sound great and the circuitry is interesting so ...please share some of that expertise.Any insight of that 12AX7 pre-amp tube emulator with two IC's.

[teemuk]

Nope, the book is still under work. I'm doing some minor additions and some guys are proof-reading it. It will take a while until it's finished.

I will not discuss Pritchard's inventions. Anyone who is even slightly familiar with his designs (and the way in which he presents them) should understand that circuitry based on such complexity has little or no use for the DIY-spirited. I don't like deciphering his unconventional schematics either.

If you are really interested, patents are of course public domain.

US Patent 4809336 Solid State Amplifier With Tube Amplifier Characteristics (1989)
US Patent 4995084 Semiconductor Emulation of Tube Amplifier (1991)
US Patent 5133014 Semiconductor Emulation of Tube Amplifiers (1992)
US Patent 5434536 Semiconductor Emulation of Tubes (XGPA 1995)
US Patent 5636284 Solid State Emulation of Tube Audio Power Amplifiers (1997)
US Patent 5734725 Tube Emulator Amplifier System (1998)
US Patent 5761316 Variable and Reactive Audio Power Amplifier (1998)
US Patent 5761317 Tube Amplifier Fat Emulation Structure (1998)
US Patent 5802182 Audio Process Distortion (1998)
US Patent 5805713 Solid State Circuit for Emulating Push-Pull Tube Amplifier (1998)
US Patent 5848165 Fat Sound Creation Means (1998)
US Patent 6057737 Non-linear Asymmetrical Audio Amplifiers (2000)
US Patent 6411720 Speaker Systems with Lower Frequency of Resonance (2002) "Tunnel-back cabinets"
US Patent 6631195 Speaker Attenuation for Practicing (2003)

google patents - literally