[allinhead]

i have a class A amp is not hot at all 
 Theore and realty may deffer some times ...
 
and you didn t anwsered my question by the way "can you let your hand on the top"
because hot for some one can be just warm for other 
thanks

 

[raoultrifan]

All Class-A amplifier transistors are hot to touch, otherwise it's not Class-A anymore, right? Now depends what the idle current would be and how the heat from the output transistors is dissipating to the case, so what Class-A headamp do you own and you're referring to, please?
 
For HPA-3B & 3U the case itself it's part of the heatsink, so it will be quite warm to hot to the touch after a couple of hours of operation and I mean at least 50C during summer. Power required from main would be around 15W when idling and even more when headphones connected and driven.
 
More about this here:
http://www.head-fi.org/t/770610/introducing-the-matrix-m-stage-hpa-3u-and-hpa-3b-review-to-follow/60#post_12178996
http://www.head-fi.org/t/770610/introducing-the-matrix-m-stage-hpa-3u-and-hpa-3b-review-to-follow/105#post_12397517
http://www.head-fi.org/t/770610/introducing-the-matrix-m-stage-hpa-3u-and-hpa-3b-review-to-follow/60#post_12157815
 
As you can see, I had lowered voltage from 36V to 30V, so I can use other op-amps; this also means internal temperature decreased a bit, so now it's less than 50C (I can do a measurement tonight again if you like).

 

[allinhead]

My AMP is the nuforce udh 100 and is just gently warm .
 
50C is to much for me so i decide to go SE withe the beresford capella .
Yes i have seen your work that realy good but i am not a DIY guy in Electronique.
 
Do you have a balanced dac ? If not, have you heard improvement with balanced phone ?
 
Enjoy your listening  

 

[raoultrifan]

NuForce UDH-100 is most likely a very good headamp, but temps are lower mostly because the output transistors are not directly connected to the case. Like I said, HPA-3B has a small case and this is also part of the heatsink, this is why the higher temps. HPA-3B might have a higher transistor current as well and also the no. of output transistors are probably doubled because of balanced operation.
 
Yes, I do have a balanced DAC (ASUS Essence One DIY MUSES) and I was very please with increase in scene when going balanced with my Matrix headamp.

 

[Ampeezy]

Just put in the 2x LME49710HA on browndogs and boy has the sound become much clearer. The highs are more prominent but not in a harsh way, just more balanced and in line with the other frequencies. Overall Highs are much more detailed, which is the most significant improvement. There is also better transparency, everything is more separated, with more pin point and three-dimensional sound-staging. I know the LME49710HA may not be the ideal op-amp for rolling with the +/-18v regulators but for now I will enjoy them 

 

[serg1245]

Has anyone compared the sound of the first Matrix M-stage (2012) with the new M-stage HPA-3B?

There is a difference in the sound of the Single End Headphone Output? 

 

[gto88]

Anyone compared the 3B to the Liquid Carbon. I'm looking for an amp to pair with ifi micro iDSD and LCD3. This is only half the price of the Liquid Carbon seems to perform really well.

Sent from my SM-N920V using Tapatalk

Any one who own both HPA-3B and LC?  They both are balanced amp, it would be good to have a comparison.

 

[tecnos6]

Thanks for your hard work, effort and time guys, really really cool what your doing to this 'little' amp. I was after a fully balanced amp to power my LCD-X's and you guys found it for me, just ordered and on its way.

 

[Ampeezy]

  Thanks for your hard work, effort and time guys, really really cool what your doing to this 'little' amp. I was after a fully balanced amp to power my LCD-X's and you guys found it for me, just ordered and on its way.

Nice, Hope you enjoy them 

 

[Carlitos]

hello everyone!
 
can you guys recommend some clear/agressive/bright opamps?
 
btw, do i need to get the opamps with the dip adapter?
 
=)

 

[canthearyou]

hello everyone!

can you guys recommend some clear/agressive/bright opamps?

btw, do i need to get the opamps with the dip adapter?

=)

Sparkos Labs opamps.

 

[Carlitos]

=O
 
thanks
but, how about the cheap stuff?

 

[Ampeezy]

  =O
 
thanks
but, how about the cheap stuff?

2x LME49710HA on adaptors. I use them, and the top end is very present and detailed. Some folks here raised concerns about the amp having +/-18v and the lme49710HA having a recommended max of +/-17V. Has worked fine in mine though for the past month and a half. I think you are fine as long as you dont use max gain very often.

 

[Carlitos]

ok thanks
 
will get those LME
 

 

[Ampeezy]

  ok thanks
 
will get those LME
 

http://www.ebay.com/itm/141710809457?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
 
This is the ready-made version, very convenient