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Old 5th April 2013, 12:26 PM   #13031
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2 in series pr rail can handle the 24V rails
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Old 5th April 2013, 12:37 PM   #13032
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Originally Posted by AudioSan View Post
2 in series pr rail can handle the 24V rails
...and will halve the capacitance...
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Old 5th April 2013, 12:55 PM   #13033
rade95 is offline rade95  United States
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Originally Posted by danny_66 View Post
Changing the feedback resistors to 220ohm will not only change the gain but also how the F5 sounds and I didn't like that.
There is a forum topic called F5 Listening Impressions started by Bear and this has lot of comments and suggestions about all sorts of mods, including feedback changes and how it affects sound. In fact I think it would be really cool to start a new topic called "F5 mods and such" and have a table that F5 builders could fill in to say what mods they've made (FB, JFETs, BIAS, outputs, PS, etc etc) and what listening experience they've had with those changes in comparison with the stock amp. Also what music source, pre-amp, speakers and enclosures volume they've had and how big the listening room was. I think lot of people would be interested to see this. There were lot of mods made and it would be nice to have it all summarized in a single place.
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Last edited by rade95; 5th April 2013 at 01:03 PM.
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Old 5th April 2013, 01:05 PM   #13034
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Originally Posted by permaneder View Post
...and will halve the capacitance...
yes. but i don't realy see a problem With "only" 1.5F pr rail.
and one may want to have a CRC supply. then there will be 3F pr rail.
but i would not use this kind of caps
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Old 5th April 2013, 01:20 PM   #13035
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You need some major neon lights to go with those caps.
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Old 5th April 2013, 01:38 PM   #13036
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Quote:
Originally Posted by AudioSan View Post
but i don't realy see a problem With "only" 1.5F pr rail.
Your transformer and rectifier bridge will.
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Old 5th April 2013, 01:49 PM   #13037
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Originally Posted by jacco vermeulen View Post
Your transformer and rectifier bridge will.
not more then with 3F pr rail
and this is why i also said that i would not use this kind of caps.
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Old 5th April 2013, 01:53 PM   #13038
AndrewT is offline AndrewT  Scotland
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How long should we expect 1.5F or 3F capacitors take to charge up?
What maximum current should we set for the charge current limiter?
Where best to fit that charge current limiter?
Can we start using the amplifier when the capacitor charge has reached 50% of final voltage or 70% or 80% or 90% or 95% or 99%?
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Old 5th April 2013, 02:33 PM   #13039
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Quote:
Originally Posted by AudioSan View Post
not more then with 3F pr rail
Not exactly less either.
If one jumps off a cliff, whether the drop is 1500 or 3000 feet, is of no importance, only the edge is.

What does matter is how those cheap car things are constructed.
Reliable lytic brands manufacture caps in a 20Vdc (to 25) rating, three times lower ESR, with value numbers of 1F and above.
But they charge at least five times the retail of a China transgender. (Digital my A..)

Either way, charging 2x1.5F total or up by a conventional setup sounds scary.
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Last edited by jacco vermeulen; 5th April 2013 at 02:36 PM.
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Old 5th April 2013, 02:49 PM   #13040
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acctualy. the important thing in that case will be when the chute opens
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