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Old 29th March 2011, 08:30 PM   #11
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The MyRefC chip amp would be the only one that I could recommend from experience. It is quite remarkable, but not really in the same league as a Pass amp. I've never heard a Quad so I can't make a comparison.
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Old 29th March 2011, 08:46 PM   #12
weskoki is offline weskoki  Europe
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Quote:
Originally Posted by Bill Fuss View Post
The MyRefC chip amp would be the only one that I could recommend from experience. It is quite remarkable, but not really in the same league as a Pass amp. I've never heard a Quad so I can't make a comparison.
Bill would love to hear more about the difference between these amps!
I do agree that Pass would sound more detailed
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Old 29th March 2011, 09:07 PM   #13
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I've built quite a few Pass amps, the Alephs have a lush liquid sound with varying degrees of detail depending on many things. This is probably OT. You can PM me if you wish.
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Old 29th March 2011, 09:22 PM   #14
jemraid is offline jemraid  United Kingdom
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Hi all,

For the reasons above I am going to make a Jean Hiraga 'le monstre' originally designed to be the solid state's answer to the valve 300B.

The thread on this forum is here, this is page 74 and post 733 is the one to read to begin with; Hiraga "le monstre"

Cheers - Jim
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Old 29th March 2011, 09:41 PM   #15
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Any recommendations for top designed Gainclones etc would be great too.
Something like an amp base on LME49811 + SANKEN ALLEGRO STD003 or OnSemi Thermaltrack has very good reviews that might be almost equal or just equal to class A amps. For the first project it would be more convenient to order a kit with ready to go PCB.

I would say that sound quality very dependable on passive components - power supply electrolytic & decoupling capacitors, attenuators etc. It is possible to get a pretty decent sound from an LM3886 or LM1875 based amp if treat ICs right.
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Old 29th March 2011, 10:21 PM   #16
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I debated whether to even comment here , but here goes....

#1 - "warm sound" ," natural", "powerful"," transparent",dry ... all snake oil terms loosely dropped to make $$$$. An amp should be invisible ,it should be just your preamp or source with 32db voltage gain along with several thousand current gain. Any deviation from this is error. At clipping, this is different. An amp can clip "sharply" or "smoothly". Either way , this is a error in amplification and basically describes the tube Vs. Solid state controversy. Not counting this error , two amps that are run optimally might sound just SLIGHTLY different by design , or inadequate design .. or for having a different power supply (big factor). Again, this is an error as it deviates from the perfect "wire with gain" ideal (the invisible amp).

#2 - "class war" - Why would you burn 2000 watts to hear only 400 of them ?
Some do as they say it sounds better. The amp actually just makes a different "error" than one of another class would (AB or D). All 3 classes can be made to make the smallest of "errors" (.001%THD). At this point of "fanatic" engineering , we humans would not even perceive these differences.
I have heard 200 watt class A's sound exactly like 200w class AB's until you reached a very dynamic passage that took advantage of the AB's greater efficiency. All this is measurable and predictable by the operation of these topologies. Knowing "which was which" would be the only factor different between the two to subjectively bias the assessment.

#3 - If someone has a preference to "color" their sound , leave that to the many different loudspeakers/crossovers or diverse source manipulations, (tube preamps - 30 band EQ's , DSP processing). If a amp sounds "harsh" or "muddy"
(BAD ) , this is a result of a bad design choice that can be measured and predicted (cheap power supply , junk semi's bad design or a REAL bad layout). Just another error which makes the amp "visible".

Oh .. come on !!! , " lush liquid sound" ... would one get wet ??
Sanken = transconductance tailored for audio (no IRFP's in my amps)
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Last edited by ostripper; 29th March 2011 at 10:36 PM.
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Old 29th March 2011, 11:15 PM   #17
Bigun is offline Bigun  Canada
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Originally Posted by ostripper View Post
I debated whether to even comment here , but here goes....
where to begin!
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Old 29th March 2011, 11:27 PM   #18
Bigun is offline Bigun  Canada
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Bluegrass,

you weren't happy with a hot amp being left turned on (valves) - this would seem to rule out most Class A amps, they are all by nature going to run hot unless you have oversized heatsinks for a given idle current.

for a Class AB amplifier, solid state, state of the art - it's not necessarily going to be a simple project. My best sounding SS amp was fairly simple [designing TGM3 - output Triples ] but I would also suggest looking at this one: RMI-FC100, a single stage audio power amplifier
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Old 30th March 2011, 02:05 AM   #19
qusp is offline qusp  Australia
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yes, without the desire to get down into the nitty gritty, i really dont see how you can build a top shelf performer of any type, except of the buy it yourself variety. i especially feel that sjostromaudio's smd gainclone is going to be beyond your ability and the research/reading needed to do any of these well is substantial.

only option is where all the design choices are made for you imo, such as the pansonaudio kits. these are the ones i was recommending before and someone else since, utilizing the lme49810/11/30 driver chips to drive mosfets, thermantrak, or other 3 pin transistors and you can fairly easily buy a couple and try different output devices
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Old 30th March 2011, 03:18 AM   #20
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If you want to build something that sounds good but isn't expensive to try , then build an LM1875 chip amp. Typically 20 watts per channel and sounds good. After you listen to that and compare with your set up you can determine which way to go .......and that will be more expensive and possibly require more energy and time to complete.

A single stage 6922 preamp might give you the sound you like even with a ss power amp. Tubey but detailed. Parts do matter !

Maybe you should build the tube pre amp first ?
Cheers.
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Last edited by ashok; 30th March 2011 at 03:22 AM.
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