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Old 3rd February 2018, 01:34 AM   #11
Zen Mod is online now Zen Mod  Serbia
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naaah

I'm using this (pictured while testing donuts briefly , so no fan ) :

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when exploiting full power of my extremely dummy load (2 x 8R/250W in slim format) , I need a fan , so usually looking like this after :
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Old 3rd February 2018, 01:48 AM   #12
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LOL!
Not bad.
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Old 3rd February 2018, 12:45 PM   #13
PierreQuiRoule is offline PierreQuiRoule  Canada
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Quote:
Originally Posted by Zen Mod View Post
In a meantime , just observe red marked positions on schm in post #3
Intentionally breaking symmetry to add 2nd to taste?
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Old 3rd February 2018, 01:15 PM   #14
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what else ......... that's the name of the game in last decade or two

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Old 3rd February 2018, 01:18 PM   #15
PierreQuiRoule is offline PierreQuiRoule  Canada
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Must be one of the cheapest upgrade ever
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Old 3rd February 2018, 01:34 PM   #16
PierreQuiRoule is offline PierreQuiRoule  Canada
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Beautiful work by the way. Very clean and tiddy for such a large project. Thank you for sharing.
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Old 3rd February 2018, 01:51 PM   #17
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as I wrote .... Cap bank – it would be neater (wiring) with Computer Grade style caps , metal rails, shorter wires , less wires …… but function is there , even if style is little rough

anyway , just visual issue , that's why I didn't think twice , when Robert already had these
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Old 3rd February 2018, 05:54 PM   #18
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Default few more excerpts from blog post

Now , few words about THD spectra shaping ;

Papa taught us during the years several tricks how to imbalance that perfect Symmetry (ironic , isn’t it …… working principle of amp itself is called Supersymmetry/SUSY , while we are trying to spoil it 🙂 ) .

Anyway , we want some sugar , and we are getting that with 2nd harmonic above 3rd ; again – Papa’s Lectures – some people prefer that way (Tubelovers?) , while some people prefer dominance of 3rd (Sandworshippers?).

Further – we can divide both of these groups by polarity of dominant harmonic- some prefer negative , some prefer positive.

What can I do regarding that , except to find how (hardly first one knowing that) and then organize easiest way of doing it ……..

If you take a look at LTSpice schematic of amp (third pic from top) , you can see two resistor positions circled in red. These resistors are path to modulation of Aleph CCS-es and their values are directly defining amount of that modulation , thus defining amount of Aleph CCS-es contribution in output signal .

So , simple ; disclaimer – my goal is to invoke 2nd , and control it’s polarity and amount :

-If these two resistors are same in value , there is greatest amount od symmetry , resulting in zilch 2rd ,dominant 3rd.

-If we increase value of said resistor at side of positive output , there is increase of 2nd (and dominance over 3rd) , while our dear 2nd being negative phase,

-If we increase value of said resistor at side of negative output , there is increase of 2nd (and dominance over 3rd) , while our dear 2nd being positive phase.

That’s it .

How it is organized in vivo ?

I had idea to introduce sort of already know device among Greedy Boys , called -ZAP (Zen Amount Pot) , but later decided that would be impractical , and probably leading to constant play with , while forgetting enjoyment in music 🙂 …. so I decided to use pin sockets/or whatever their name is , in said resistor positions , thus allowing easy change of resistors in situ , without involving soldering equipment etc.

Click the image to open in full size.
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Old 3rd February 2018, 06:19 PM   #19
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Now , if you take a look at Eagle front End schematic and Eagle Front End pcb screenshot (4th and 5th pics from top) said resistor positions are R3 and R53 , with R3 being position of our special interest .

My taste dictate R53 being 1K , and R3 being 1K2 ; for anyone else’s taste , all what’s needed are few different resistor values and pincette/tweezers ; just power amp off , pull resistors out (gently,please) and push new one in (gently again , please).

After that you can power amp on , or go out for beer and some talk , I don’t care 🙂




Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 3rd February 2018, 06:20 PM   #20
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Some technical stuff:

-Donuts : I ordered 900VA made on 1K2VA cores ; later -when actual winder guy itself contacted me to confirm few things , he said – do not worry , it’ll be 0.9T … they’re having static shield and outer tape shield .

-Bridges are Big.

-Each rail filter consisting of 90mF-0R11-90mF , resulting in 23V5dc.

-Iq smidge above 7A , resulting in 100W/8R , 80W/4R , Winter blessing being in range of 360W per box.

-Relative offset wandering some 25-30mV from stone cold to hysterically warm (top of sinks being 17C above ambient).

-Absolute offset frozen around -350mV , right from powering up , all the way to hysterically warm.

-Iq change around -4% , from stone cold to hysterically warm.

-No power on thump , while power off thump is no more than small plop , even on my LC1B , they being sensitive on air flow induced by cat crossing next yard ……

-Weight – smidge above 60kg.

And yes – there is additional pair of drek binding posts at back , accepting any Remote Power On/Off voltage from 10 to 35Vdc, polarity irrelevant.

I forgot to write SuperSymmetry/SUSY anywhere on pcbs , but I didn’t forgot what’s more important:

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