My Amp Keeps blowing a fuse...
Comments
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Certainly but just because some make false claims doesn't mean that a push/ pull Class A amplifier is not technically possible.
Probably better to drop it. We aren't going to agree 100% based on the verbiage and in the end it's not as important as the attention the issue is getting. I had my say......I'm moving on.
H9"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | Roon Nucleus 1 w/LPS - Tubes add soul! -
Your too nice.
Thanks for the complement, Fred!
I agree about the Push-Pull Class A. There are many Push-Pull Class A (real Class A without ever going into
amps out there including that of NP. Trying out Different Audio Cables is a Religious Affair. You don't discuss it with anyone. :redface::biggrin: -
Yep there's been several examples (though mostly older designs)from the likes of Levinson,Bedini,Musical Fidelity,Krell ,Classe and Threshold.
I agree about the Push-Pull Class A. There are many Push-Pull Class A (real Class A without ever going into amps out there including that of NP. -
Thanks for the complement, Fred!
I agree about the Push-Pull Class A. There are many Push-Pull Class A (real Class A without ever going into amps out there including that of NP.
Definitely not in line with my electronic training. I'm with H9 on this but what do I know (that training is soooo far away)...Yep there's been several examples (though mostly older designs)from the likes of Levinson,Bedini,Musical Fidelity,Krell ,Classe and Threshold.DARE TO SOAR:
Your attitude, almost always determine your altitude in life
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Well something for you to ponder, the oft quoted Mr.Pass refers to his super sym. Push Pull XA.5 Series as "Pure Class A".Whereas the X.5 Series is refered to as high bias Class A/B.Definitely not in line with my electronic training. -
I've had my eye on Red Wine Audio, Plinius, and Bryston among other; any feedback?
Not to derail you guys
, but does anyone have opinions of any of the above amps as I have leads on all of them, but haven't heard them. Here are my thoughts:
I 90% like the sound of my speakers with the Tripath amp I have now, and supposedly the Red Wine is Tripath at it best; especially since it's battery powered.
Bryston has some of the lowest distortion and noise numbers in the industry, which obviously are a plus with sensitive horns. Plus, it is designed with a short signal path, low number of transistors, and minimum distortion starting from the first watt even though it is class A/B.
Plinius uses a JFET input and supposedly sound like a class A amp, even though it is A/B. -
Well, how about Pure Marketting Tactics?Well the oft quoted Mr.Pass refers to his super sym. Push Pull XA.5 Series as "Pure Class A".Whereas the X.5 Series is refered to as high bias Class A/B. To ny knowledge, while class A provided the best sound it was not an efficient way to do so. Class B was not a good performer SQ wise while Class C was better performer power wise but with very poor quality of sound (the worse of the 3). Class AB was created as a trade off providing for best combination of power performance and audio performance using push pull technology.
Modified AB operating as a class A is NOT in my opinion a true Class A.An Alternative?
Where it is not feasible (economically or otherwise) to use a Class-A amp in the tweeter frequency range, a modified Class-AB amp could be used. The modification needed is to increase the quiescent current (to perhaps 1 Amp or so) so that the amplifier operates as Class-A for any signal below about 8 Watts - assuming a well behaved 8 ohm load such as a tweeter. Such a modification to an existing amp is quite simple for an experienced electronics engineer or service person, but will almost certainly require that the heatsinks be upgraded to prevent the destruction of the output devices. It is also probable that additional capacitors will be needed for the power supply - and possibly a regulator or capacitance multiplier circuit, too. Without these, the hum level may become intrusive, which rather negates the whole purpose of the exercise. Some basic experimentation is required for anyone thinking along these lines.
http://sound.westhost.com/class-a.htmDARE TO SOAR:
Your attitude, almost always determine your altitude in life -
Yeah what are you thinkin?Not to derail you guys,
No experience with Plinius or Red Wine but which Bryston model?I have a 3B ST and 2BLP and PP120.does anyone have opinions of any of the above amps as I have leads on all of them,
Rod Elliots site is always a great resourse of info but in that article he is in disagreement with you.
Modified AB operating as a class A is NOT in my opinion a true Class A.
http://sound.westhost.com/class-a.htm -
Those integrated amps would be the Red Wine Audio Signature 30.2 LFP-V Edition, Plinius 9100, and Bryston B-60R SST.
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I like the Plinius as gives the best of both world. Actually I believe the Plinius doesn't act as a class A but rather can be selected in either A or AB, am I correct? Nice review on them anyway... http://www.soundstage.com/revequip/plinius_sa102.htmDARE TO SOAR:
Your attitude, almost always determine your altitude in life -
The B60 has a very nice pre using discrete Class A opamps.The amp section is essentially the same as in my 2BLP though mine has the older (non SST)output devices.I would characterise my 2B as reasonably neutral but with sweet top end and surprisingly dynamic and punchy bass for a small amp.
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Definitely not in line with my electronic training. I'm with H9 on this but what do I know (that training is soooo far away)...
Are you saying your book has only one chapter and it ended? Or are you not going into chapter 2 and so on?Well something for you to ponder, the oft quoted Mr.Pass refers to his super sym. Push Pull XA.5 Series as "Pure Class A".Whereas the X.5 Series is refered to as high bias Class A/B.
Great Point you made there! A lot of these High End amps are now called called Pure Class A even though they are Push-Pull.Well, how about Pure Marketting Tactics? To ny knowledge, while class A provided the best sound it was not an efficient way to do so. Class B was not a good performer SQ wise while Class C was better performer power wise but with very poor quality of sound (the worse of the 3). Class AB was created as a trade off providing for best combination of power performance and audio performance using push pull technology.
Modified AB operating as a class A is NOT in my opinion a true Class A.
http://sound.westhost.com/class-a.htm
Refer to chapter 2, Page 1. Read Differences between Class A topology and why Push-Pull is also Real Class A. (This advise is not for Brock, his book has only one chapter coz additional chapters are still written by Papa Pass at this time...:biggrin:)
Sorry Jake! I couldn't help it. Last derail though, I promise! :redface:Trying out Different Audio Cables is a Religious Affair. You don't discuss it with anyone. :redface::biggrin: -
I like the Plinius as gives the best of both world. Actually I believe the Plinius doesn't act as a class A but rather can be selected in either A or AB, am I correct? Nice review on them anyway... http://www.soundstage.com/revequip/plinius_sa102.htm
looks great!! -
Shhhh...we're talking about Class A. :biggrin:Those integrated amps would be the Red Wine Audio Signature 30.2 LFP-V Edition, Plinius 9100, and Bryston B-60R SST.
FYI, your Plinius link isn't working."He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche -
I am not familiar with the red wine audio amps but it looks pretty impressive. I like the idea of the class A tube stage triod. You can't go wrong with Byston either. As Face mentioned, your link for the plinius doesn't work would be nice to see it.Those integrated amps would be the Red Wine Audio Signature 30.2 LFP-V Edition, Plinius 9100, and Bryston B-60R SST.DARE TO SOAR:
Your attitude, almost always determine your altitude in life -
I forgot that the Red Wine has a 6922 class A input.
It appears that the Plinius website is not working at the moment. I will re-link it when it is. -
I think may take a crack at the Red Wine Audio Signature 30.2 LFP-V Edition Stereo Integrated Amplifier. It may be a $3K Tripath amp, but I've been able to find nothing bad about it and Vinnie thinks it will be worlds above my current Tripath based King-Rex T20U+PSU which I like a lot. Battery powered amps have always interested me since I've owned noise sensitive horns, and his smart charging system with new Lithium Iron Phosphate batteries seems to be the best available.
I guess that means I need to put my Jantzen Audio custom Shuguang Treasure S300MK integrated amp up for sale... -
I think may take a crack at the Red Wine Audio Signature 30.2 LFP-V Edition Stereo Integrated Amplifier. It may be a $3K Tripath amp, but I've been able to find nothing bad about it and Vinnie thinks it will be worlds above my current Tripath based King-Rex T20U+PSU which I like a lot. Battery powered amps have always interested me since I've owned noise sensitive horns, and his smart charging system with new Lithium Iron Phosphate batteries seems to be the best available.
I guess that means I need to put my Jantzen Audio custom Shuguang Treasure S300MK integrated amp up for sale...
Sorry but I think it;s a mistake to sell a very nice 300B tube amp and replace it with a SS amp for use with horns.
Let us know your reaction.
H9"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | Roon Nucleus 1 w/LPS - Tubes add soul! -
I enjoy my Tripath amp now, and in all the reviews I've read, Vinnie builds the best Tripath that competes against SE tubes and SS class A. That being said, I will be able to use the amp in my system before a purchase decision needs to be reached, so I will let me ears decide and do an A/B with this amp, a cheaper Tripath, and the 300B.
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It's not Quasi Class A that I am talking about here. It could be Class A SE or Class A Push-pull but they are real Class A. There are lots of older ones from the 70s, 80s, 90s, and early 2000s you can buy under 2K.
Jake,
This is what I talked about before. This one is from Canada so shipping would be a killer but it's an idea for the Class A Integrated.
No affil to the seller.
http://cgi.ebay.com/LUXMAN-L-550-STEREO-INTEGRATED-AMP-PURE-CLASS-READ-/140535334820?pt=LH_DefaultDomain_2&hash=item20b88f07a4Trying out Different Audio Cables is a Religious Affair. You don't discuss it with anyone. :redface::biggrin:
