F5 Turbo Builders Thread - Page 87

GentryBa · 7th January 2013, 07:49 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, 08:00 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, 08:16 PM

agree with Trondheim Boy

AudioSan · 7th January 2013, 09:05 PM

we agree on alot this days

nrg2009 · 7th January 2013, 09:10 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, 09:18 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, 09:51 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, 10:02 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 · 10:10 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 · 7th January 2013, 11:22 PM

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, 08:16 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, 10:02 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, 10:08 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 10:10 PM.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
F5 Turbo Circuit Boards	chchyong89	Pass Labs	2347	14th July 2014 02:19 PM
B1 builders thread	Bas Horneman	Pass Labs	696	14th July 2014 12:57 PM
F5 Turbo is posted	Nelson Pass	Pass Labs	635	6th April 2014 10:51 AM
F5 turbo problems	Rob Dingen	Pass Labs	17	11th January 2013 08:38 PM
F5 Turbo ............. if only !!!!!!	a.wayne	Pass Labs	23	21st January 2012 02:24 AM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

7th January 2013, 07:49 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, 08:00 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, 09:05 PM	#864
AudioSan diyAudio Member Join Date: Feb 2009	we agree on alot this days

7th January 2013, 09:10 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, 09:51 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?

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read