Favorite Threads and Posts in "Solid State"

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#22
 
#30
I'm following this thread (link below). There's very good info on whether or not replace "old" (but still good) transistors on vintage Japanese amplifiers...

http://www.diyaudio.com/forums/solid-state/269466-to92-transistor-replacement.html

Many start all this by replacing the electrolytics first and, at a certain point, someone comes saying: "don't forget to replace that "x" transistor as well!!".
A few times I followed the advise, then painfully regret it. The stock transistor in that 1977-78 amplifier was working very well actually.

I like these threads because a lot of myths simply are smashed!

P.S.: Of course, if the tranny is noisy and making problems, we replace it...
 
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#31
I'm having a blast with this one:

http://www.diyaudio.com/forums/solid-state/275171-improve-rotel-amp-thd-20db-15.html

And not just because I happen to have a Rotel RA-820AX gathering dust that won't know what hit it right after I finish other projects: it's a masterclass in modding and a wonderful learning tool, the perfect "now let's get our hands dirty" companion to Self's amp book. Miss it at your peril.

Cheers,

Cabirio
 
#33
Learning and using LTSpice to develop your amplifier.

This thread contains 3 different projects:

  • A high performance 200W/8R / 400W4R amplifier
  • A high performance 70W/8R / 140W4R MOSFET amplifier
  • A high performance discrete opamp "MyDOA" in 2520 layout.
http://www.diyaudio.com/forums/soli...ormance-class-ab-power-amp-200w8r-400w4r.html

The index in the first post will be updated from time to time for a quick access to milestones.

Have fun, Toni
 
#34
Multiple personalities

I had the chance to play a friend's solid state guitar multi amp a while back, and was fairly impressed at its ability to mimic various tube amps and configurations.
Has anyone seen an implementation for this in playback stereo amps? And no, I don't mean a tube buffer, which I've tried without them turning solid state amps' sound into tube sound.
My thinking is, with modern DSP, it may not be that difficult to profile a given tube's distortion profile, and impose it on a solid state amp's output.
Links or thoughts on implementing this?
 
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