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Chip Amps Amplifiers based on integrated circuits

My_Ref Fremen Edition - Build thread and tutorial
My_Ref Fremen Edition - Build thread and tutorial
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Old 8th December 2013, 10:16 PM   #1301
ClaveFremen is offline ClaveFremen  Italy
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My_Ref Fremen Edition - Build thread and tutorial
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Originally Posted by bcmbob View Post
Is this the same as your Hf Coltve cap Dario ?
Yes

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Old 8th December 2013, 10:46 PM   #1302
bcmbob is offline bcmbob  United States
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Thanks. I promise I won't say anything about that ugly heat sink you are still using - Not a word.
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Old 9th December 2013, 05:19 PM   #1303
Kreisky is offline Kreisky  Italy
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Quote:
Originally Posted by bcmbob View Post
I got in at V1.2 C so have no reference for tha A version. I'll just report my general view on upgrading. The progression through the C range, and I'm including individual component upgrades within each version, were primarily subtractive. More music got through with fewer distracting artifacts. When that happens the apparent impact is increased due to better clarity and definition.

Though maybe a little dramatic, my first comment on the FE was a quantum separation from it's predecessors. That was still related to refinement more than additional power and/or SPL. You are correct that some/many improvements require spending a little more. I'm sure Dario agrees as he purposesly published two versions of the Fremen Edition - economy and full.

So my best answer is any flavor of MyRef, probably including the A that I didn't hear, is a cut above many DIY and most commercial amps in a wide price range. A builder can stop anywhere along the development path and be more that pleased with the performance. Time and cash investment are personal choices, but I haven't heard anyone say they regretted the increase in either. I suggest you trust the often posted comment "The best sounding amp I have ever owned", or what's that other one?? - Gobsmacking
Thank you for your reply Bob, by the way I have to wait until next summer just to have time and money to do the upgrade, so first I will change C13 in C version just to understand how the sound change between a Evox Rifa end the K75... I hope the sound will became a little smoother in HF.


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Old 14th December 2013, 11:09 PM   #1304
madisonears is offline madisonears  United States
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I want to amend some comments I made recently regarding R10.

I recently installed Mundorf Silver/Oil capacitors in my tweeter (ScanSpeak HDS) crossover circuit, and that has provided my system a new level of resolution and refinement. I now realize that my previous judgments were in error. After extended listening in room and careful listening at close range, it is apparent that the Shinkoh resistor I favored might not be the best for that position. I'm not sure yet that the Riken is the best either.

I can definitely hear more "ting" on cymbals and a bit brighter edge and more emphasis on highest frequencies from the Shinkoh. The Riken provides more ring or shimmer to cymbals with a softer edge and a slight rounding of high frequencies. Upper midrange of the Shinkoh is a bit sharp on brass and highest female vocals but better defined and more forward, while the Riken is sweeter and more musical with fine "inner" layering, but just a bit too smooth with some loss of definition and impact, slightly recessed. This is in direct contrast to what I previously believed. I prefer the more musical sound of the Riken overall, but I am not satisfied that it provides enough detail. I think this is the contradiction that plagues most stereo equipment. I'm not saying which is better -- more detailed or more musical. I cannot say anything about bass performance because of the system configuration.

These findings were first determined without knowing which resistor was in which amp. Amps were swapped between channels during the trial, and the difference clearly followed. Imagine my surprise when I removed the covers. I am not afraid to admit I was wrong. The search continues. Every part matters.

Peace,
Tom E
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Old 15th December 2013, 09:41 AM   #1305
bcmbob is offline bcmbob  United States
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Tom, this may be sacrilege to some, but what you report seem to come close to what DSP provides. With your (and Jac's )experience with active crossovers is there a possibility some external contraption could provide/cover those minute adjustments without detracting from the FE performance? We often half-seriously comment on the possibility of switchable C9/C13 configurations, but that would probably require a rework of the PCB. Maybe a tiny daughter-board ???
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Old 15th December 2013, 10:00 PM   #1306
madisonears is offline madisonears  United States
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Bob, not sure what you mean by adjustments. I don't want to adjust or manipulate the signal with DSP or anything else; I want to find the right part for R10 so the amp always sounds the best. Got a couple things on order, so maybe next week I'll have more to write about.

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Tom E
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Old 16th December 2013, 06:38 AM   #1307
bcmbob is offline bcmbob  United States
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I'm not a fan of DSP either, but believing different parts match up with various music styles, it would be nice to have something flexible other than multiple amps I'm probably describing dual or multiple signal paths rather than actual DSP. I have no idea if that's possible, but so many report on competing positive features of caps that I am beginning to believe the "best one" will always resolve to a compromise if we have to pick just one. If I had more/some EE knowledge I'd figure something out, but.......
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Old 16th December 2013, 08:39 AM   #1308
ClaveFremen is offline ClaveFremen  Italy
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Quote:
Originally Posted by madisonears View Post
I prefer the more musical sound of the Riken overall, but I am not satisfied that it provides enough detail. I think this is the contradiction that plagues most stereo equipment. I'm not saying which is better -- more detailed or more musical.
Hi Tom,

I do agree the Riken is more musical (and somewhat colored) but lacks the last bit of detail.

Since the amp is already so detailed (sometimes even too much... ) I think the Riken is a good match.

Quote:
Originally Posted by madisonears View Post
These findings were first determined without knowing which resistor was in which amp. Amps were swapped between channels during the trial, and the difference clearly followed. Imagine my surprise when I removed the covers. I am not afraid to admit I was wrong. The search continues. Every part matters.
Really interesting

Quote:
Originally Posted by madisonears View Post
I want to find the right part for R10 so the amp always sounds the best. Got a couple things on order, so maybe next week I'll have more to write about.
If you didn't already, consider also a Caddock MK132 for R10, I didn't mentioned it in BOM since its price/performance ratio is a bit low but it's probably the most neutral resistor you can use on that position (markings from ground to signal).
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Old 17th December 2013, 12:24 PM   #1309
davym is offline davym  Scotland
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I have a result, partially

I've been chasing a hum issue for weeks now which has been making a fool of me, it was partly caused by a nosy SMPS elsewhere in the house but that was not the full story. Everything I did seemed to influence it but not totally cure it.

Anyway I totally rewired my DCB1 and now only have low hum in one speaker, that happens to be the one which is connected to the monoblock FE which has a re-used transformer which also produces more mechanical noise than the other one which has a brand new transformer.

Seems that the noisy one has been infecting the whole system so I have ordered another new transformer. I have silence from the good channel now and I have to put my ear to the speaker driver on the noisy one to hear it so I think I'm finally on the right track.

I hate hum, so many weird and contradictory things happen and reporting them all makes you seem nuts

To start off with I could hear it from my seat so things are vastly improved now, maybe with the new transformer I can finally disconnect the PGND to star ground connection as Dario has instructed.

Hopefully I have not annoyed him too much with all this hassle, not sure if he's still speaking to me

Anyway the FE's are brilliant amplifiers, the best I've ever heard and I fully encourage anyone to build them, the sound quality is so good that it's well worth getting them right.

Cheers

Davy
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Old 17th December 2013, 02:30 PM   #1310
shoom is offline shoom  Europe
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Quote:
Originally Posted by davym View Post
I have a result, partially

I've been chasing a hum issue for weeks now which has been making a fool of me, it was partly caused by a nosy SMPS elsewhere in the house but that was not the full story. Everything I did seemed to influence it but not totally cure it.

Anyway I totally rewired my DCB1 and now only have low hum in one speaker, that happens to be the one which is connected to the monoblock FE which has a re-used transformer which also produces more mechanical noise than the other one which has a brand new transformer.

Seems that the noisy one has been infecting the whole system so I have ordered another new transformer. I have silence from the good channel now and I have to put my ear to the speaker driver on the noisy one to hear it so I think I'm finally on the right track.

I hate hum, so many weird and contradictory things happen and reporting them all makes you seem nuts

To start off with I could hear it from my seat so things are vastly improved now, maybe with the new transformer I can finally disconnect the PGND to star ground connection as Dario has instructed.

Hopefully I have not annoyed him too much with all this hassle, not sure if he's still speaking to me

Anyway the FE's are brilliant amplifiers, the best I've ever heard and I fully encourage anyone to build them, the sound quality is so good that it's well worth getting them right.

Cheers

Davy
Great work Davy.

And nice to hear that things have been resolved to your liking.
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