F5 Turbo Builders Thread - Page 87

GentryBa · 7th January 2013, 08:49 PM

2x30 VAC of course, sorry...

ok, that sounds nice, AudioSan!
would 4ohm speakers be a Big Problem?

best regards,
Matthias

AudioSan · 7th January 2013, 09:00 PM

4ohm will not give you much class A power. then you are down to 20W class A. and about 170W class A/B. i would use a little bigger transformer for that. but it all depends on your volume

Zen Mod · 7th January 2013, 09:16 PM

agree with Trondheim Boy

AudioSan · 7th January 2013, 10:05 PM

we agree on alot this days

nrg2009 · 7th January 2013, 10:10 PM

Wow!! AudioSan brings in the heavy metal!! Wow, that's a lot of heatsinks.. You better upgrade your electrical connections to your house!

AudioSan · 7th January 2013, 10:18 PM

hehe

a 30A curcuit for the amp alone maybe

i have 4 more of those sinks. and i acctualy need even 8 more

Quote:

Originally Posted by nrg2009

Wow!! AudioSan brings in the heavy metal!! Wow, that's a lot of heatsinks.. You better upgrade your electrical connections to your house!

AudioSan · 7th January 2013, 10:51 PM

ZM. a question. i have pr now R5/6 at 1Kohm, and 7.1mA J-fets(i forgot to calculate a reise of the resistance)
i can solder in some 2.2Kohm resistors. or i have another set of 7.1mA J-fets i can solder in, to dobble up the J-fets. what would you do? i don't know if 2.2K will be enough for 7.1mA fets. but with dual 7.1mA fets, 1Kohm chould be enough? right?

Zen Mod · 7th January 2013, 11:02 PM

considering that you're going to Turbo (driving 3 pairs ? yes ?) , I would toss another pair of small Toshiba critters in

in any case - metal film resistors are pennies each , so every time when you buy them , buy triple your needs ....... and not just values you need in a moment - then you'll have them when you need them

I'm hearing differences between resistors only in really low level circuits - for power stages you're always more than good with cheapest MF resistors
those already are of decent industrial quality , and that's serious thing

AudioSan · 11:10 PM

acctualy 4 pairs

yes i know. i ordered dobble up of most. but ofcourse, not of the right ones for this case

i may find som others if i go thru my binds

but for this case, i think i go with dual J-fets. that was my plan from the beginning becouse of the 4 pairs outputs. it can be a little on the limit for 1 pair of J-fets.
i use Dale CMF60 all the way on this ones. exept the 3W's ofcourse. and R2 (forgot to order 47.5Kohm resistors)

AudioSan · 8th January 2013, 12:22 AM

amp layout. and diodes soldered in. only outputs and some wireing left until first start up. also soldered in another pair of J-fets.

7th January 2013, 09:16 PM	#863
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	agree with Trondheim Boy __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM

7th January 2013, 11:02 PM	#868
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	considering that you're going to Turbo (driving 3 pairs ? yes ?) , I would toss another pair of small Toshiba critters in in any case - metal film resistors are pennies each , so every time when you buy them , buy triple your needs ....... and not just values you need in a moment - then you'll have them when you need them I'm hearing differences between resistors only in really low level circuits - for power stages you're always more than good with cheapest MF resistors those already are of decent industrial quality , and that's serious thing __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM

7th January 2013, 11:08 PM	#869
AudioSan diyAudio Member Join Date: Feb 2009	acctualy 4 pairs yes i know. i ordered dobble up of most. but ofcourse, not of the right ones for this case i may find som others if i go thru my binds but for this case, i think i go with dual J-fets. that was my plan from the beginning becouse of the 4 pairs outputs. it can be a little on the limit for 1 pair of J-fets. i use Dale CMF60 all the way on this ones. exept the 3W's ofcourse. and R2 (forgot to order 47.5Kohm resistors) Last edited by AudioSan; 7th January 2013 at 11:10 PM.

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7th January 2013, 08:49 PM	#861
GentryBa diyAudio Member Join Date: Oct 2011 Location: Bavaria	2x30 VAC of course, sorry... ok, that sounds nice, AudioSan! would 4ohm speakers be a Big Problem? best regards, Matthias

7th January 2013, 09:00 PM	#862
AudioSan diyAudio Member Join Date: Feb 2009	4ohm will not give you much class A power. then you are down to 20W class A. and about 170W class A/B. i would use a little bigger transformer for that. but it all depends on your volume

7th January 2013, 10:05 PM	#864
AudioSan diyAudio Member Join Date: Feb 2009	we agree on alot this days

7th January 2013, 10:10 PM	#865
nrg2009 diyAudio Member Join Date: Apr 2009 Location: Detroit, born and raised in the netherlands.	Wow!! AudioSan brings in the heavy metal!! Wow, that's a lot of heatsinks.. You better upgrade your electrical connections to your house!

7th January 2013, 10:51 PM	#867
AudioSan diyAudio Member Join Date: Feb 2009	ZM. a question. i have pr now R5/6 at 1Kohm, and 7.1mA J-fets(i forgot to calculate a reise of the resistance) i can solder in some 2.2Kohm resistors. or i have another set of 7.1mA J-fets i can solder in, to dobble up the J-fets. what would you do? i don't know if 2.2K will be enough for 7.1mA fets. but with dual 7.1mA fets, 1Kohm chould be enough? right?

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