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.
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.
Attachments
Bengali said:
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.
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!
Bengali said:you described it 100% correctly
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!
troystg said:
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
ClaveFremen said:Hi Gabanyayaya,
my MyRef sounds very good with a LOT of sockets.
For sure solder joints are better but for testing I can't hear any difference.
Since some caps (Silmics for instance) would not fit directly in those sockets, I've trimmed caps legs with a nail file.
Good testing!
Dario,
Thanks....certainly i will do this to the Obbligator that i have now...i learn my lesson today when removing C32 to replace it with Wima. Too much desoldering might ruin the only MyRef C board that i have....thanks!
ClaveFremen said:
C30 must be read as FKP2 1nF 100V (mines are 100V)
For those that want to try the baseline mod here it is the Mouser BOM for the Import Tool:
505-MKS2.22/100/10|2
505-MKP4.1/250/10|4
505-FKP21000/100/5|2
505-FKP20.022/63/2.5|2
505-FKP2150/100/2.5|2
505-FKP20.01/63/5|2
In Europe alternate sources are Banzai Effects and RS Components.
Attachments
ClaveFremen said:
Excelent information..
I will swap out those components on the made kit when I assemble my other set of PCB's with the upgrades.
Right now I am making 3 sets of 41Htz AMP 32 PCB's.. WAY more difficult to assemble those SMB components than these hole throughs. A total PITA!!
I can't wait to go back to assembling my second Rev_C and Steve Dunlaps' Krill.
Hi soongsc,
actually MMG's are 4 ohm impedance. that's why I chose 20V 200VA transformer instead of higher one.
aside from that, I don't need to turn it up very loud.
I use a mini-Aleph with the MMG's. the mini-A is only about 10W per channel. Sound is incredible, very smooth and wide sound stage. I can listen for hours and use it for movies as well.
I was hoping my ref C can produce similiar sound so I can build 5 channel version. It could very well be MMG's just not a match for the my ref C.
thanks.
Hmm, I haven't had the time to put mine together yet, but I wonder whether the current drive section is for 8Ohm. It seems that the current delivered is proportional to the input voltage. Wasn't it mentioned somewhere that some component change was necessary to drive less than 8 ohm load?Bengali said:
For those that are going to try the baseline mod I suggest to DC couple first att'n: Make sure there's no DC offset from the output of your pre!!!).
I'm suggesting this because C13 has a great impact on sound and characterize it masking some of the effects of the mods (the Kemet/Arcotronics included in kits is particularly bad in that sense...).
It's for this reason that I've done all my tests with a DC coupled MyRef.
Once the ampli is fully calibrated it's easier to select the most transparent C13 cap that better suits your taste.
att'n: Make sure there's no DC offset from the output of your pre!!!).I'm suggesting this because C13 has a great impact on sound and characterize it masking some of the effects of the mods (the Kemet/Arcotronics included in kits is particularly bad in that sense...).
It's for this reason that I've done all my tests with a DC coupled MyRef.
Once the ampli is fully calibrated it's easier to select the most transparent C13 cap that better suits your taste.
I pulled C13 and did DC Couple. Sounds much better. I still get the sharp 'zzzz'. What did you do to get rid of this sharp highs?
I watched Phantom of the Opera in HD and turned the volume up. Sounds pretty good for a little chip amp. 2 Channel music is good
but with movies, this amp does better.
thx
I watched Phantom of the Opera in HD and turned the volume up. Sounds pretty good for a little chip amp. 2 Channel music is good
but with movies, this amp does better.
thx