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Old 4th March 2013, 11:04 PM   #3811
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by Tea-Bag View Post
Here is my approach to FW amps.
I believe ZM taught me this.

Take all ground wires from Speakers , line signal and and solder all to PS ground at back end, In the middle of the V+ and V- outputs. In that same area, take CL60 and tie that to chassis ground with bolt, and from there, bolt wire to IEC power cord ground.
So a CL60 seperates everything from direct chassis or IEC ground.

From here, shorting the inputs should lead to a quite amp. If not. Twist toriod, or cover toriod and or the Jensen's with MU-Metal (careful not to short).

Is your setup different?
That's how i do it....dead silence!....between music
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Old 10th March 2013, 08:44 PM   #3812
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My little freak.
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Old 10th March 2013, 08:57 PM   #3813
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nice



now - do the same , but with just one xformer

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Old 10th March 2013, 09:53 PM   #3814
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My little freak.
absolutely cool
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Old 11th March 2013, 01:15 AM   #3815
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Originally Posted by Zen Mod View Post
nice



now - do the same , but with just one xformer

Damn. Why didnt you say something before I drew it.
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Old 11th March 2013, 01:29 AM   #3816
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So bad, I was thinking of combining cinemag and Jensen in two halves of the amp :-)
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Old 11th March 2013, 01:31 AM   #3817
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Single transformer becomes f6/j2 hybrid, but thinking on the feedback point. You would seem to lose symmetry of transformer, but ZM wouldnt say it unless he is either making fun or completely serious. Inquiring minds want to know. Wheres my etcha sketch?
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Old 11th March 2013, 01:43 AM   #3818
Zen Mod is offline Zen Mod  Serbia
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didn't had that idea when we exchanged these few e-mails

it just came to my mind , when I saw your pcb

like always - I need a pen and paper to be able to think , but didn't had time tonight

but , I have some feeling it's possible , using nasty tricksess

(remember that you're having 4 same windings in one xformer ...... and that you are going to drive entire shebang differentially )





( so - I'm semi serious , this time ; am I allowed to use cap , or two ?

edit : if not , then you might see my usual square mile pcb , with plenty of parts ...... while just few are touching the signal )
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Last edited by Zen Mod; 11th March 2013 at 01:49 AM.
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Old 11th March 2013, 01:50 AM   #3819
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I know, and just as I thought had completed something and was going to rest easy. Gollum, Gollum.

I will try mine first to see. I will be thinking on yours. No rest for the weary

Main reason I like the idea is possiblity of no feedback(especially with cascode FE) on local parts with only fancy feedback to clean it up. Dunno, Might be stupid or stupendous. OR should that read stupindous
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Old 11th March 2013, 01:54 AM   #3820
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you should try that with two already made pcbs

matter of one wire

or not even that ; careful measurement will only tell is it any gain in common feedback arrangement ( for two halves of balanced ) vs. regular fdbck against real gnd scheme

think of function of McMilan resistors ; in some balanced configurations/parts values combos they're more effective , in some are almost zilch effective
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