This is not just another gainclone

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#1,441
So, finally I built a couple of GCs myself. Thanks to platenspeler and Fedde for finding me a case as I am working in my kitchen...

I am using Toroid 120 VA at 2*25 V with Elna RJH 2200 uF. Resistors are modest Roederstein with SCR coupling (to be replaced by MIT soon). Rectifiers are discrete MUR860 and I am using a 6 A line filter used in a Swedish high-end product. The reason for that is that I had no other line connector. I opted for a complete amp in one chassis to reduce the number of boxes. The GC is built on a 5 mm profile which is bolted to the bottom with silpads and the whole case is used as a heatsink. The profile also extends across the width of the chassi and is slightly higher than the transformer. No sign of oscillations and the amp is dead silent wiht or without input connected. I have the inverting and non-inverting resistors to ground connected at 18 and 22 k respectively as per KYW suggestions.

Sound is promising.
 

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#1,443
Re: Nice!

swede said:
Beautiful!

I've seen the progress of the work (on the kitchen table), and considering the amount of time UrSv's employer demands, it is a pleasure to see that he also finds time for this wonderful hobby!

//magnus
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And I need more time. The center channel Proac 2.5 kind-of-clone project has been started in the kitchen meaning that I need 6 amps total to bi-amp them all. I have 2 so far...
 
#1,445
Originally posted by Peter Daniel One thing that I miss comparing to LM is a bit of extra air around vocals. I also hear some midrange flattening. [/B]
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You say toma👍to I say toma(h)to !!

It might just come down to individual (system?) preferences because I see we notice similar differences. It's just in my opinion after careful listening I concluded the LM was overblown in the midrange .I didn't think it was so bad in vocals but natural instruments like piano and horns seemed harmonically "wrong" in some way.
The other point is that you might have managed to "iron out" some the mid's with your extremely careful choice of components,damping,support etc so that the OPA might sound a bit deader by comparison.However I thought the differences in the end were fundamental in terms of harmonics and I am not sure they could be completely compensated.
 
#1,446
Final touch

Hi Peter,

Fantastic job you've done with you gainclone!
May I suggest a final touch there?
You can add a blue led somewhere hidden behind the acrylic, in a way that it gets all illuminated.
Oh yes, that would be beautiful :devily: .
If you do it, please post the photos!

Cheers
 
#1,447
Fred Dieckmann said:
There must be something to all that talk about Swiss precision engineering after all.........
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If that was with reference to my amps I would almost have expected you to mention the Swedish chef as I am building them in the kitchen...and anyhows I don't know if to interpret it as positive or the other way as I am not quite sure what they say in your part of the world about Swiss engineering. I am quite happy with the results and hopefully the MIT PPFX will bring something good.
 
#1,449
UrSv said:


If that was with reference to my amps I would almost have expected you to mention the Swedish chef as I am building them in the kitchen...and anyhows I don't know if to interpret it as positive or the other way as I am not quite sure what they say in your part of the world about Swiss engineering. I am quite happy with the results and hopefully the MIT PPFX will bring something good.
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Swiss engineering is regarded here as pretty good.😉 And your amp is more than pretty good.

Very clean job, almost like the inside of a Rolex.
You might consider not using coupling caps at all if your source doesn't presen't DC offset.
 
#1,450
Peter Daniel said:

Swiss engineering is regarded here as pretty good.😉 And your amp is more than pretty good.

Very clean job, almost like the inside of a Rolex.
You might consider not using coupling caps at all if your source doesn't presen't DC offset.
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Thanks Peter and I did actually think about not using any coupling cap at all but I left it in. When I build the next one it will be with the exact same components and I will try then and see then what the difference is in this implementation.

Unfortunately I had to make it a bit bigger than a Rolex as soldering becomes to difficult at that size for me.
 
#1,451
UrSv said:

Thanks Peter and I did actually think about not using any coupling cap at all but I left it in. When I build the next one it will be with the exact same components and I will try then and see then what the difference is in this implementation.

Unfortunately I had to make it a bit bigger than a Rolex as soldering becomes to difficult at that size for me.
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Also, I would watch out using netfilters! Try once without...

Fedde
 
#1,452
fedde said:


Also, I would watch out using netfilters! Try once without...

Fedde
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I will. The ones I use come from a place that makes pretty decent amps and I thought I'd use them. I know you might get an improvement but just as well a real degradation using the wrong one. I'll test is later as they say...
 
#1,458
Preamp for gainclone

I saw another thread that asked about a preamp for a gainclone but I didn't see any conclusions. I'd like to put a preamp in the same case as my gainclone amp, but with separate power supplies for amp and preamp. Any suggestions would be appreciated.

Thanks,

Vic
 
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