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Old 1st May 2009, 10:33 PM   #641
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Quote:
Originally posted by pinkfloyd4ever
you mean the differences between DC coupled and using a Mundorf?
No, the difference is huge between the vanilla MyRef and the modded one.

I'm not talking of night and day differences but is last 5% that makes the difference...
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Old 2nd May 2009, 04:42 AM   #642
Bengali is offline Bengali  United States
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Hi Guys,

Thanks Uriah and Peter for the my ref C pcb's.

I've built up a stereo version with a 20V 200VA antek.
I'm using 1uF k42y PIO's.

First power up, no smoke :-) I get about 1.2mV and
around .50mV on the outputs.

They are hooked up to a pair of Maggie MMG's.
Pre amp is aikido 6SN7. Originally I'm using a mini-Aleph.
The Aikido and Mini-Aleph is a wonderful combination
to my taste.

okay, the my ref C, initial thoughts, the high's a very tinny,
women's voices have that sharp raspy sound. for movies,
it's not as bad but does not seems balanced overall.

I'll let it break in for while and listen later. Sorry, I'm
not trying to stir up anything, just my perception of
how it sounds compared to the mini-A.

it's definately a step up from the standard gainclone I've
built.
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Old 2nd May 2009, 06:32 AM   #643
soongsc is offline soongsc  Taiwan
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Bengali, what speakers are you using? If DIY, do you have zobels for the tweeters?
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Old 2nd May 2009, 07:06 AM   #644
Bengali is offline Bengali  United States
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Hi Soongsc,

I'm using Magnepan MMG's.

I'm built it per the schematic/bom used here in these posts.

thanks.
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Old 2nd May 2009, 08:14 AM   #645
Tony X is offline Tony X  France
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Quote:
To me if anyone is going to mod this MyRef you HAVE to remove C13 and put a wire in place of it then measure for DC. If it is still acceptable this is probably the best change you can make
Hi Uriah,

Do you measure with everything connected, input and load?
What would you consider acceptable DC level?
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Old 2nd May 2009, 09:08 AM   #646
soongsc is offline soongsc  Taiwan
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Quote:
Originally posted by Bengali
Hi Soongsc,

I'm using Magnepan MMG's.

I'm built it per the schematic/bom used here in these posts.

thanks.
I did some search, and it seems that these have 6 Ohm impedance, and are not very effecient. Wonder if the transformer is not big enough.
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Old 2nd May 2009, 12:51 PM   #647
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Quote:
Originally posted by Bengali
okay, the my ref C, initial thoughts, the high's a very tinny,
women's voices have that sharp raspy sound. for movies,
it's not as bad but does not seems balanced overall.

I'll let it break in for while and listen later. Sorry, I'm
not trying to stir up anything, just my perception of
how it sounds compared to the mini-A.
Bengali, I think you're right.

Thanks to my socketed MyRef I've just restored it to the initial state (FMs, BQs, bypasses and so on) and bass is bloating, sound is thick but highs are tin, harsh and too much, soundstage is wide but deepness is flat.

I've then started reapplying all my mods starting from the last: C32

Wow on the vanilla MyRef this single mod has a big effect on bass!

All others mods made also their magic but C32 already fixed some things previously fixed by others mods (mainly bass ones).

With all mods and FMs as elcos it sounds good but with the Silmics is much better.

I've then reverted to vanilla and after to totally modded:

they're two different beasts, for sure!

Little or no harshness, a granitic bass, more harmonics and reverb, deeper sounstage.
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Old 2nd May 2009, 11:28 PM   #648
Bengali is offline Bengali  United States
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Quote:
Thanks to my socketed MyRef I've just restored it to the initial state (FMs, BQs, bypasses and so on) and bass is bloating, sound is thick but highs are tin, harsh and too much, soundstage is wide but deepness is flat.
Hi Dario,

you described it 100% correctly :-) I was not sure how to put it in words.

So changing the C32 150pF feedback cap from an AVX
to WIMA really made a difference?

I could give that a try on my next mouser/digikey order.

I'll go through your list of mods later and see what I can tweak.

Thanks for taking the time and sharing your efforts!
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Old 3rd May 2009, 02:53 AM   #649
troystg is offline troystg  United States
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Quote:
Originally posted by Bengali


Hi Dario,

......

Thanks for taking the time and sharing your efforts!......

Absolutely!! I appreciate all the work you did on the testing.
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Old 3rd May 2009, 03:27 AM   #650
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Quote:
Originally posted by Bengali
you described it 100% correctly :-) I was not sure how to put it in words.

So changing the C32 150pF feedback cap from an AVX
to WIMA really made a difference?

I could give that a try on my next mouser/digikey order.

I'll go through your list of mods later and see what I can tweak.

Thanks for taking the time and sharing your efforts!
Quote:
Originally posted by troystg
Absolutely!! I appreciate all the work you did on the testing.
Thanks to both

Yes Wimas FKP2 in C32, at least for bass, make a clear difference and add some harmonics too, particularly with FMs.

Every feedback on mods is welcome
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