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Old 7th January 2013, 07:49 PM   #861
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2x30 VAC of course, sorry...

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

best regards,
Matthias
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Old 7th January 2013, 08:00 PM   #862
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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
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Old 7th January 2013, 08:16 PM   #863
Zen Mod is offline Zen Mod  Serbia
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agree with Trondheim Boy

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Old 7th January 2013, 09:05 PM   #864
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we agree on alot this days
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Old 7th January 2013, 09:10 PM   #865
nrg2009 is offline nrg2009  United States
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Wow!! AudioSan brings in the heavy metal!! Wow, that's a lot of heatsinks.. You better upgrade your electrical connections to your house!

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Old 7th January 2013, 09:18 PM   #866
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hehe a 30A curcuit for the amp alone maybe
i have 4 more of those sinks. and i acctualy need even 8 more

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

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Old 7th January 2013, 09:51 PM   #867
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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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Old 7th January 2013, 10:02 PM   #868
Zen Mod is offline Zen Mod  Serbia
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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
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Old 7th January 2013, 10:08 PM   #869
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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.
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Old 7th January 2013, 11:22 PM   #870
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amp layout. and diodes soldered in. only outputs and some wireing left until first start up. also soldered in another pair of J-fets.
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