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Old 28th October 2011, 06:50 PM   #11111
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The answer seems to be into the question.
"The stock F5 circuit is a little shiny. Paralleling up outputs might help your
perception of the amplifier."
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Old 28th October 2011, 08:12 PM   #11112
alazira is offline alazira  United States
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vtr,
Increase feedback resistors R9-12 to 200R and source resistors R3/R4 to 20R (R1 schematic). It will produce a warmer sound as well as increase output volume
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Old 28th October 2011, 10:00 PM   #11113
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Change resistors to carbon will alter the balance of the sound quite a lot (gate stoppers, main I/V, f/back, power fet sources) plus using soft recovery diodes, Elna power caps, and increasing the 'R' in the C-R-C power supply (or use a choke), multi-stranded wiring, etc will all contribute to a "softer" sound - there's no end to the combinations.

Also, early on in this thread, "jackinj" did a sim design with input resistors and caps, and you can also use "juma" BF862 for an input gain stage that can be setup for a "softer" sound, or you could even build an input valve gain stage like in the Moskido ......
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Old 29th October 2011, 08:23 AM   #11114
vtr is offline vtr  Switzerland
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Default thanks this sounds good

as i would like to keep my single pair output irfs ill try to reduce feedback-any stabilty problems with half the feedback?

i use the original schematic and will take out one 100r feedback resitor

and i use already a choke input supply, and i keep my solid cables i avoid stranded wire whereever possible as i trust Allen wright principles





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vtr,
Increase feedback resistors R9-12 to 200R and source resistors R3/R4 to 20R (R1 schematic). It will produce a warmer sound as well as increase output volume
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Old 29th October 2011, 03:19 PM   #11115
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Quote:
Originally Posted by vtr View Post
as i would like to keep my single pair output irfs ill try to reduce feedback-any stabilty problems with half the feedback?

i use the original schematic and will take out one 100r feedback resitor
The F5 is right on the edge of what of how much feedback you can use
without compensation capacitors. Reducing the feedback on it won't
hurt it at all.
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Old 29th October 2011, 04:01 PM   #11116
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Hi people!
I'd say that is definitely the ultimate schematics of the audio amplifier F5.
Place the schematic here and move on.
On which side of this post I can see a picture made ​​amplifiers F5?
thanks and cheers

Last edited by formula 22; 29th October 2011 at 04:08 PM.
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Old 29th October 2011, 04:48 PM   #11117
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Oye hombre, no tiene ninguna idea qu t dices, no ?
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Old 30th October 2011, 05:59 AM   #11118
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Originally Posted by jacco vermeulen View Post
Oye hombre, no tiene ninguna idea qu t dices, no ?
Hi
I'd write in English to understand the other id.
Thanks
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Old 30th October 2011, 08:19 AM   #11119
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Quote:
Originally Posted by formula 22 View Post
Hi
I'd write in English to understand the other id.
Thanks
Sorry, I don't understand what you [2] are talking about
LOL
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Old 30th October 2011, 10:43 AM   #11120
h_a is offline h_a  Europe
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Quote:
any stabilty problems with half the feedback?
Don't forget that your amp's gain will increase accordingly. Hannes
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