Amplifiers:Pass Labs 5FT
Name | F5Turbo Power Amplifier |
Approx Cost | $xxxxx |
Type | Push/Pull Class A |
Designer | Nelson Pass |
Specifications
Name | Description |
Volatge Gain | xxxx dB |
Bandwidth | xxx |
Phase | xxx |
Output Power | F-5T v2 - 50 Watts per channel into 8ohm F-5T v3 monoblock - 100 Watts into 8ohm |
S/N Ratio | xxxx |
Rated Consumption | xxxx |
Idle Consumption | xxxx |
Output Impedance | xxxx |
Intro
This page is under active construction as of 9/2020.
I'll be cribbing most material from 6L6's excellent Illustrated Build Guide. Once I start getting into my own build, I may swap out some pictures and details with my own experience.
Even this introduction is going to go away. Authors waxing-poetic doesn't age well, and the audience just wants the goods.
At the time of this writing, 9/2020, the wiki image system seems busted. I've been using imgur for years, so I'll do that again here to make it work.
I'll be cribbing most material from 6L6's excellent Illustrated Build Guide. Once I start getting into my own build, I may swap out some pictures and details with my own experience.
Even this introduction is going to go away. Authors waxing-poetic doesn't age well, and the audience just wants the goods.
At the time of this writing, 9/2020, the wiki image system seems busted. I've been using imgur for years, so I'll do that again here to make it work.
Schematic/Blueprint

There is one error in this schematic - R26 should be 10K
Also, in my opinion, C3 and C4, labeled here as ‘OPT’, are required for stability from destructive oscillation. This is a very high bandwidth design and those caps help protect it from ultrasonic HF oscillation. Use 1000pF. Also, if oscillation is a problem for your build, increase the value of the gate resistors (R13 -16 and similar) any value from 47.5R to 680R will work and sound fine, the higher the value the more damping occurs.
Bill of Materials
PCB $49 diyaudiostore
Enclosures
Recommended enclosure is the diyaudio 5U $499. Includes: heat-sinks, screws, and many other things you'll need.
height 210mm, width 360mm, depth 400mm. height 8 1/4in x width 14 1/4in
Heat sinks
Included with diyaudio 5U above: Two 40mm thick x 200mm deep
Enclosures
Recommended enclosure is the diyaudio 5U $499. Includes: heat-sinks, screws, and many other things you'll need.
height 210mm, width 360mm, depth 400mm. height 8 1/4in x width 14 1/4in
Heat sinks
Included with diyaudio 5U above: Two 40mm thick x 200mm deep
Simulations and Analysis
xxxx
Illustrated Build Guides
F5Turbo Illustrated Build Guide by 6L6
https://www.diyaudio.com/forums/pass...ild-guide.html
F5T components, parts you use
F5 Build by CanAm Man
http://www.diyaudio.com/forums/pass-labs/183941-another-f5-build-beautiful-music-different-drummer.html
Planning an F5 build - some beginner questions
http://www.diyaudio.com/forums/pass-labs/137955-planning-f5-build-some-beginner-questions.html
https://www.diyaudio.com/forums/pass...ild-guide.html
F5T components, parts you use
F5 Build by CanAm Man
http://www.diyaudio.com/forums/pass-labs/183941-another-f5-build-beautiful-music-different-drummer.html
Planning an F5 build - some beginner questions
http://www.diyaudio.com/forums/pass-labs/137955-planning-f5-build-some-beginner-questions.html
References
Firstwatt F5 article, Nelson Pass
F5 Manual PDF, Pass talks about this manual as required reading before attempting this build
F5 Turbo Power Amp PDF, Nelson Pass
F5 Manual PDF, Pass talks about this manual as required reading before attempting this build
F5 Turbo Power Amp PDF, Nelson Pass
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