Zen Revisited Vs Anthony Holton A/B amp - Page 2 - diyAudio
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Old 15th May 2001, 09:50 PM   #11
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Cool Holton 200w MOSFET Amp

I've looked at the Holton schematic for an N-channel amp. It's very attractive. My guess is that it probably sounds great at high volumes, but a little mushey at low sound levels. Has anyone heard it?

But if the sound is as good as the excellent graphics on his web-site, then it should be great!

I think I'm still going to build it. Has any one heard it demo'd?

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Old 17th May 2001, 02:05 AM   #12
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Location: Tasmania, Australia
Default Reply from aussieamps

The mosfets only have to be matched per bank.
meaning the + voltage rail bank and the -voltage rail bank.
With regard to the sound quality. It has a very detailed sound stage at any SPL. It would probably be the sweetest sounding amplifier I have heard anywhere. Including the Passlabs amplifiers. Excluding the X-series however...
I haven't got around to building one yet, But I will...

regards

Anthony Holton
http://www.aussieamplifiers.com
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Old 19th May 2001, 08:02 AM   #13
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Default n channel moisfet amp

Hi Anthoni Holton,

re yr n channel mosfet amp

Is there a common substiture for 2SC3298?
and IRF 610

I couldn't found it in my home town

Thank you for yr kind attention.
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Old 20th May 2001, 09:15 AM   #14
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Um, folks...hate to be picky, but wouldn't it be more polite to E-mail Anthony directly using the little Mail icon? At the least, check with Jason on his policy (if any) regarding for-profit transactions on the site. I suspect it's okay as long as it doesn't get too flagrant, but...
Jason, what say ye?

Grey
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Old 20th May 2001, 05:59 PM   #15
Jon T. is offline Jon T.  United States
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You can get the 2SC3298 from MCM electronics:

http://www.i-mcm.com/welcome.jhtml

Motorola also makes a version of this transistor, the MJL3298, which is available widely.

From what I understand of the schematic, that transistor is just a series pass transistor for the bias regulator circuit, so any decent power transistor should be usuable in that application with minimal changes.

The IRF610 is very widely available. Digikey has them, for instance.

-Jon
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Old 20th May 2001, 08:45 PM   #16
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Sir Grey - I've reviewed the last several e-mails, and I have not seen any reference to commercial transactions.

Inquiries about technical components and sound quality, yes. But no commercial talk. I think you may have read something into those e-mails.

Sorry if we ruffled any feathers... :-)

Rich
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Old 20th May 2001, 10:07 PM   #17
Jon T. is offline Jon T.  United States
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My bad. Motorola does not make a version of the 2SC3298. I got it confused with the 2SC3281, which they do make (MJL3281).

However, NTE lists it as one of the components they second source. Their number is NTE2576. You can get NTE transistors from many local electronics stores.

-Jon

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Old 20th May 2001, 11:14 PM   #18
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Rich,
More towards the top than recently...
Just wanted to raise the possibility that people wanting to buy circuit boards etc. could contact Anthony directly since Jason provided the means to do so. Some places are more sensitive than others about that sort of thing. Plus, it could get a bit raucous if several people were touting their wares, all at the same time.
Ask Jason...it's his site.

Grey

N.B.: None of this is to be interpreted as criticism of Anthony's circuits. I haven't built any of them, but they all look quite reasonable. Just looking them over, I'd say they should provide as good--if not better--sound than some other circuits that have garnered far more attention.

[Edited by GRollins on 05-20-2001 at 06:22 PM]
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Old 21st May 2001, 02:07 AM   #19
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Default transistor alternatives


Thanks Jon for helping Dexter out... I had not got back to him in time.
You are right of cause the transistor is only used as a pre-regulator for the bias ccT. and almost any power transistor in the TO220 package will work. Its worth noting that a power Mosfet will work here as well. IRF610, IRF710, IRF530 etc.
The main reason the 2SC3298 was used here was for its case dissipation capability of 30 watts.
As this device has to drop over 60 volts across its self.
The IRF610 can be subbied for IRF710. Harris also make this device as well.

regards

Anthony Holton
http://www.aussieamplifiers.com
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Old 25th May 2001, 11:13 AM   #20
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Smile Zen Revisited v/s Anthony Holton A/B amp

Hai guys,

I just followed this thread on becoming a member and straightaway would like to post the following:

The thread was started as Zen Amp (revisited) v/s Anthony Holton's SYMMETRICAL AMPLIFIER but along the way due to a reference to the use of 2SK2915 Mosfets instead of IRF240s, the attention got diverted to Anthony Holton's N-channel Amplifier. Be that as it may, I built the N-channel amplifier without incorporating the most recent changes for thermal stability that Anthony posted on 4.4.01. I should say that it is indeed a great amplifier. The detailing, dynamics, low end slam and musicality of the amplifier are indeed exceptional. To say the least, this amp does not have the usual `blur' of Mosfet amplifiers.

About two years ago, I also built Giovanni Stochino's Ultra Fast Amplifier (I haven't yet had a look at the thread on this subject) and it was easily the best amplifier that I had ever heard. It outperformed every commercial amplifier (real Hi-End ones) within my reach. The detailing was exceptional throughout the audio spectrum; especially, the quality of reproduction of stringed instruments was live. The overall sound stage reproduced by this amplifier was very `forward'. Though I now have both the above mentioned amplifiers (in addition to many others), I have not yet done an A-B test between these two greats. I hope to do so soon and will keep you all posted.

Finally, I have not attempted the various flavours of Zen Power amplifiers, as I made the Bride of Zen preamplifier and found it to be a good sounding circuit, but the sound was very `dry'; eg., violin strings sounded too metallic and flute lacked real air(iness). This single Hexfet preamp was outperformed by a basic version preamp using OPA204 and both were bettered by a Class A discrete preamp using MAT02 and MAT03 in the input stages. This rather discouraged me from building the Zen amps.

I hope to also report on a comparison of the N-channel amp with a 30 watt Class A amplifier, Power Follower that can be found at http://www.geocities.com/researchtriangle/8231.

Whoever wants to build the N-channel amplifier, just go ahead and do it; it is very easy (take precautions in the handling of Mosfets) and definitely worth listening.

Thanks and hope to hear from some enthusiast.



[Edited by Samuel Jayaraj on 05-28-2001 at 03:28 AM]
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