Any reason why Pass is not Dual Mono amp???

[Melon Head]

Very nice work modster
Those motor run caps, I see in the amp. Is there a significant audible improvement using them?
I have some 10uf wima caps laying around but I am considering buying some 100uF motor run polypropylene capacitors.
Is it worth it putting them in?

[Zen Mod]

Originally Posted by thanh1973

Very nice work modster
Those motor run caps, I see in the amp. Is there a significant audible improvement using them?
I have some 10uf wima caps laying around but I am considering buying some 100uF motor run polypropylene capacitors.
Is it worth it putting them in?

tnx for kind words ...

my workis always like that - when I'm actually makin anything for serious ( not counting Bonsai/Ikebana prototypes )

motor runs are there from two serious reasons :

1. they give you serious improvement in "snap" of sound
2.they're much cheaper and much more potent than usual audiophool solid caps ...... and - in same time at least of same quality , if not even better ; they are , at last , of industrial quality ; our preferable brand is Icar Italy

talking about amps - look at picturte of another one - made under same circumstances - pcbs and work are mine , everything else is - of less skilled Serbian DiYA member


so - previous one is completely dual mono : 300VA donut , 2 secondaries through 2 discrete Shottky Graetzs ,4x33mF/25V Panas , 2x50uF Icar caps per channel

this one is one 600VA donut for both channels (two secondaries) , then 2 discrete Shottky Graetzs 4x33mF/25V Panas and zx50uF Icar caps per channel ; so - only donut is shared between channels

I can't hear any significant difference between these two , even if that pure dual mono have silver cabling for input and preputium Monster cabling for speaker

edit - just disregard unusual amount of usage of term "serious" in this post

[Magura]

Originally Posted by TerribleT

Hello Magura,
Nice work! I'm considering using chokes in my F5 build but is a little put off on the prices for the chokes. I think the Hammond chokes go for about $30 each. Diy chokes could be an option. Mind sharing the recipe for your chokes? What are the dimension of your chokes, wire gauge, etc...?
Thanks,
David

A search on "Magura inductor" here on the forum, should give you a fair share of info.

.....but if you're put of by 30$ a piece, the DIY version is going to give you a stroke!


Magura

[Melon Head]

I believe the biggest improvement comes from having separate power supplies per channel not neccessarily transformers, just the way you have done it.
Also 2 x 300VA transformers take up more space than a 600VA transformer, so unless you are doing monoblocks (ie separate amp cases), then I would also do it your way.
Just go with the biggest transformer you can afford, and then go with separate rectifiers and power supplies per channel.
Thanks for the info regarding the caps. I will buy some and let you know what I think.

[a.wayne]

Originally Posted by Zen Mod

tnx for kind words ...

my workis always like that - when I'm actually makin anything for serious ( not counting Bonsai/Ikebana prototypes )

motor runs are there from two serious reasons :

1. they give you serious improvement in "snap" of sound
2.they're much cheaper and much more potent than usual audiophool solid caps ...... and - in same time at least of same quality , if not even better ; they are , at last , of industrial quality ; our preferable brand is Icar Italy

talking about amps - look at picturte of another one - made under same circumstances - pcbs and work are mine , everything else is - of less skilled Serbian DiYA member


so - previous one is completely dual mono : 300VA donut , 2 secondaries through 2 discrete Shottky Graetzs ,4x33mF/25V Panas , 2x50uF Icar caps per channel

this one is one 600VA donut for both channels (two secondaries) , then 2 discrete Shottky Graetzs 4x33mF/25V Panas and zx50uF Icar caps per channel ; so - only donut is shared between channels

I can't hear any significant difference between these two , even if that pure dual mono have silver cabling for input and preputium Monster cabling for speaker

edit - just disregard unusual amount of usage of term "serious" in this post

Significant ? so there is a difference .....

Originally Posted by Zen Mod

example of dual mono in same box

only mains is shared

amp completely from Papa's head

Wow looks good ,where are the outputs ....

[Melon Head]

I think what he was trying to say, is that the difference is so insignificant that he can't tell which sounds better.
So while there maybe a difference, it may not necessarily be in the dual transformers favour.
The room that 2 x 300Va transformers take up, could be used to fit a single 1000VA transformer. I know which one I would take if you were trying to fit your amplifier into one case.

[alazira]

Originally Posted by Zen Mod

example of dual mono in same box

only mains is shared

amp completely from Papa's head

Hi Zen Mod,
Where are those brown/black wires from the lower right motor-run cap going to?

[tinitus]

Originally Posted by thanh1973

The room that 2 x 300Va transformers take up, could be used to fit a single 1000VA transformer.
I know which one I would take if you were trying to fit your amplifier into one case.

That would be the 2x 500Va

Dont forget they are intended fore relative simple and sensitive speakers
If you dont need the exstra power, huge "monsters" doesnt always sound better, or maybe even worse

[Zen Mod]

Originally Posted by alazira

Hi Zen Mod,
Where are those brown/black wires from the lower right motor-run cap going to?

blue led for blues of Babelfish J by ZM screen

[Zen Mod]

Originally Posted by a.wayne

Significant ? so there is a difference .....


......

Originally Posted by a.wayne

..........

Wow looks good ,where are the outputs ....

bank of VT4C , attached for pcb , is in other room