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Old 3rd August 2011, 09:57 AM   #11
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Quote:
Originally Posted by forr View Post
Mike Renardson's amp very detailed project is worth having a look :
MJR7-Mk5 Mosfet Power Amplifier
Methinks that one tries to be just a bit too simple. No differential pair? Less is not always more. In this case it seems like just a whole lot less.
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Old 3rd August 2011, 10:20 AM   #12
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Methinks that one tries to be just a bit too simple. No differential pair? Less is not always more. In this case it seems like just a whole lot less.
That amp is superb, me thinks you should research and understand a design before commenting. Did you know that a single cfp input stage is more linear than a LTP ???

Understand that design first, in some iterations that amp far exceeds the performans of so called blameless amps and it sounds excellent too,
Keep reading that site, Mike Renardson is a more than capable designer
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Old 3rd August 2011, 10:31 AM   #13
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Originally Posted by ingenieus View Post
Methinks that one tries to be just a bit too simple. No differential pair? Less is not always more. In this case it seems like just a whole lot less.
Less is not always more... but may be equal.
At 30 W/ 8 Ohm, the objective performances of this one are on the par with those of the best circuits published all over the world.
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Old 3rd August 2011, 10:48 AM   #14
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Thanks for the feedback.

I will have another look at the circuit. So there is life outside the Blameless world. Hmmm.....
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Old 3rd August 2011, 08:06 PM   #15
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Renardson's amp is a wonderful illustration of how good a huge amount of global Negative FeedBack with perfect mastering of frequency compensation can do. It totally disqualifies unsupported comments on NFB such as seen today here : Feedback affects Soundstage, Imaging, Transients ?

I already built a MRJ stereo amp using two mono PCBs and currently assembling two MRJ stereo PCBs, all directly furnished by Mike Renardson.

So there is life outside the Blameless world. Hmmm.....


I built my Blameless in 1974, still working. My current interest with amps having a differential input stage now goes to the push-pull VAS structure suggested by Samuel Groner's in figure 56 of his comments on Self's Book.
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Old 3rd August 2011, 08:27 PM   #16
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This one is tried and proven by me, its been my primary amp for several weeks, uses all cheap components, MJE340/350 can be replaced with BD139/140 and 2N5401/5551 can be replaced with 2N3904/3906 or BC547/557.

TIP35/36 are about the cheapest transistors you can get in complementary pairs.

Schematic: http://i.imgur.com/EQAzh.jpg
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Old 4th August 2011, 09:24 AM   #17
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My current interest with amps having a differential input stage now goes to the push-pull VAS structure suggested by Samuel Groner's in figure 56 of his comments on Self's Book.
Sounds interesting. Can you tell me a bit more?
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Old 4th August 2011, 09:46 AM   #18
AndrewT is offline AndrewT  Scotland
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Have you read Groner's Thread?
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regards Andrew T.
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Old 4th August 2011, 07:11 PM   #19
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Have you read Groner's Thread?
I assume it is this one:

Comments on Audio Power Amplifier Design Handbook by Douglas Self

Will do so. Thanks.

Last edited by ingenieus; 4th August 2011 at 07:15 PM.
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Old 4th August 2011, 07:14 PM   #20
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Less is not always more... but may be equal.
At 30 W/ 8 Ohm, the objective performances of this one are on the par with those of the best circuits published all over the world.
I ran the circuit through LTspice and it does look as good as any Blameless. Does the design scale up for higher supply voltages and output power?
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