Aleguitarpro
Well-known member
Hi.
I'm mainly a musician and my interest in building/studying designs is to know what fits best my needs.
I tried a lot of preamps recording in studios, thanks to friends, building my own etc.
I'm a classical guitar player and I record for friends and colleagues classical music and acoustic instruments mainly.
I tried following preamps/design:
NEVE 1073 style preamps (a lot of models/clones...)
API 312 /my own clones and originals
THAT based preamps (my build)
CHANDLER (germanium, LTD1, TG2)
Avalon (737, m5, 2022)
Millennia HV35, GML 8304.
The latest (AVALON m5/2022 and Millennia) are the most detailed and I like a lot my THAT1512 based preamp.
But I'd like to try to make my own class A preamp based on a DOA that I like a lot, APP992.
I tested it in my own Sontec clone and then tried in my preamp leave me very pleased.
Design goals are skip transformers and use if it's possible APP992 DOA class A everywhere.
Attached you'll find a preliminary schematic.
Most difficult part to find from standard suppliers are Q1 and Q2.
For them candidates was: 2sc2547 (I used AMEK 9098 and I liked them a lot), MAT02 (difficult to find...mostly from china), 2n4403, 2sk389 (going into FET-land).
I put BC550 in my schematic because they are very easy to find.
I'm wondering if there's something I could consider in DIP format.
I found these in SMD that could be good: 2SC2713, 2SC4117, KSC1845.
MPSA18 was second candidates in this preliminary schematic.
If is there a way to make something good/better without 3 class A DOA I'm very open to other options.
I need very low distortion, fast transients, no colour at all.
Thanks to those who will be kind enough to participate and contribute their wisdom!
I could share in exchange some of my guitar secrets, but I don't know anyone is interested in this kind of stuff here! ;D
I'm mainly a musician and my interest in building/studying designs is to know what fits best my needs.
I tried a lot of preamps recording in studios, thanks to friends, building my own etc.
I'm a classical guitar player and I record for friends and colleagues classical music and acoustic instruments mainly.
I tried following preamps/design:
NEVE 1073 style preamps (a lot of models/clones...)
API 312 /my own clones and originals
THAT based preamps (my build)
CHANDLER (germanium, LTD1, TG2)
Avalon (737, m5, 2022)
Millennia HV35, GML 8304.
The latest (AVALON m5/2022 and Millennia) are the most detailed and I like a lot my THAT1512 based preamp.
But I'd like to try to make my own class A preamp based on a DOA that I like a lot, APP992.
I tested it in my own Sontec clone and then tried in my preamp leave me very pleased.
Design goals are skip transformers and use if it's possible APP992 DOA class A everywhere.
Attached you'll find a preliminary schematic.
Most difficult part to find from standard suppliers are Q1 and Q2.
For them candidates was: 2sc2547 (I used AMEK 9098 and I liked them a lot), MAT02 (difficult to find...mostly from china), 2n4403, 2sk389 (going into FET-land).
I put BC550 in my schematic because they are very easy to find.
I'm wondering if there's something I could consider in DIP format.
I found these in SMD that could be good: 2SC2713, 2SC4117, KSC1845.
MPSA18 was second candidates in this preliminary schematic.
If is there a way to make something good/better without 3 class A DOA I'm very open to other options.
I need very low distortion, fast transients, no colour at all.
Thanks to those who will be kind enough to participate and contribute their wisdom!
I could share in exchange some of my guitar secrets, but I don't know anyone is interested in this kind of stuff here! ;D