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2359glenn | studio - Page 929

post #13921 of 13934
Quote:
Originally Posted by 2359glenn View Post
 


With the HEXFREDS there will be 1 volt drop no mater what the draw. Rated at 6 Amps/6000ma at 1200 volts.

This is headroom like no audio tube rectifier.

 

I can definitely hear the difference.  The resolution is the best I have ever heard, and I was super happy with the amp's performance in this regard beforehand.  The level of detail is downright scary sometimes. 

 

I'm not convinced it's a sound everybody will love, but some people certainly will.  I have a gut feeling that those guys who don't like to use the 3DG4 in their OTLs are going to have mixed feelings about what the HEXFRED does to the sound of an amp.  The analogy is rough, but fair enough I think.  Romantic is the last word that comes to mind when I listen to this setup.  It absolutely does sound good, but it's not the traditional kind of "good" that people expect from a tube amp.

post #13922 of 13934
Quote:
Originally Posted by Xcalibur255 View Post
 
Quote:
Originally Posted by 2359glenn View Post
 


With the HEXFREDS there will be 1 volt drop no mater what the draw. Rated at 6 Amps/6000ma at 1200 volts.

This is headroom like no audio tube rectifier.

 

I can definitely hear the difference.  The resolution is the best I have ever heard, and I was super happy with the amp's performance in this regard beforehand.  The level of detail is downright scary sometimes. 

 

I'm not convinced it's a sound everybody will love, but some people certainly will.  I have a gut feeling that those guys who don't like to use the 3DG4 in their OTLs are going to have mixed feelings about what the HEXFRED does to the sound of an amp.  The analogy is rough, but fair enough I think.  Romantic is the last word that comes to mind when I listen to this setup.  It absolutely does sound good, but it's not the traditional kind of "good" that people expect from a tube amp.


So are you going to leave them in?? I can add resistors to give voltage drop and sag to act like a tube?

I think that defeats the reason for using them. But they won't be noisy like your 6BY5.

post #13923 of 13934
Quote:
Originally Posted by 2359glenn View Post
 


So are you going to leave them in?? I can add resistors to give voltage drop and sag to act like a tube?

I think that defeats the reason for using them. But they won't be noisy like your 6BY5.

 

That's not something I would personally ask for, but I could see other people being interested in the idea.  Target the voltage to be the same as what their tube rectifier would have delivered.

 

I have no plans to take them out for now.  I don't believe in forming quick opinions anymore, I want to listen to it like this over a period of some months.  The reason I posted the impressions I did so soon was just to give people an idea.  If the sound changes or my overall opinion changes I will update everybody.  I also don't think they're quite done breaking in yet.  My hope is that the tone improves, that's the only thing I don't like.  Everything else is great, there's no such thing as too much resolution IMO.  Not everybody here has the same priorities that I do and that's kind of what I was expressing in my earlier comment.  Personally even with the tone issue I quite like the experience I'm getting from the HEXFREDs at the moment.


Edited by Xcalibur255 - Yesterday at 4:33 pm
post #13924 of 13934

HEXFRED in an OTL....

 

To begin, I haven't had the HEXFRED long enough to really understand what I am hearing. So you should consider these comments as nothing more than first impressions. Worse, I have also been trying to compare two drivers, a European Philips 6SN7GT and an ECC40, both manufactured around 1955 in the Eindhoven factory. Anyway, first I compared the the 6SN7GT and ECC40 using only the HEXFRED, and on the chance anyone is interested, I prefer the ECC40.

 

Next the rectifiers. To date, I have settled on two standard rectifiers, a Cossor 53KU, which many call a "Fat GZ37", and a GEC U18/20, which is a 4-volt version of their U52. In a nutshell, the Cossor has more bass presence while the GEC has more airy treble. I tend to prefer the Cossor with brighter drivers/output tubes and the GEC with darker ones.

 

I kept the quad of 1953 GE 6BX7 as output tubes and the ECC40 as the driver, and rolled in the U18/20. And the difference was very noticeable. The HEXFRED has more bass presence and the midrange seems a bit more full and forward. And correspondingly, the U18/20 has less bass presence, with thinner and more airy highs, again the standard GEC sound. But going by memory, compared to the GEC, the HEXFRED seemed to sound something like the Cossor. So I was intrigued....

 

And yes, after rolling in the Cossor, I feel that the tonality of the HEXFRED and Cossor are very similar. As expected, I think the HEXFRED is faster, with a bit more PRAT, but to my ears, this is pretty subtle. And again, I haven't had enough time to try to compare such things as imaging, detail retrieval and transients, much less something like liquidity, but I don't feel that I am missing anything with the HEXFRED.

 

Again, I think I am going to need a good long time to truly understand the sound of the HEXFRED compared to the Cossor. But given that it seems to compare so well with the Cossor, I wanted to report these very early impressions. In my opinion, so far, the HEXFRED is an incredible bargain for $20 plus shipping. (Until Glenn decides to raise the price! lol )

 

Oh, and I should also point out, that for those using 6AS7s in their OTL, the Cossor may well sound slightly different than it does with a quad of 6BL7/6BX7, given the larger voltage drop....

 

Anyway, hope this is useful...

post #13925 of 13934
Quote:
Originally Posted by gibosi View Post
 

HEXFRED in an OTL....

 

To begin, I haven't had the HEXFRED long enough to really understand what I am hearing. So you should consider these comments as nothing more than first impressions. Worse, I have also been trying to compare two drivers, a European Philips 6SN7GT and an ECC40, both manufactured around 1955 in the Eindhoven factory. Anyway, first I compared the the 6SN7GT and ECC40 using only the HEXFRED, and on the chance anyone is interested, I prefer the ECC40.

 

Next the rectifiers. To date, I have settled on two standard rectifiers, a Cossor 53KU, which many call a "Fat GZ37", and a GEC U18/20, which is a 4-volt version of their U52. In a nutshell, the Cossor has more bass presence while the GEC has more airy treble. I tend to prefer the Cossor with brighter drivers/output tubes and the GEC with darker ones.

 

I kept the quad of 1953 GE 6BX7 as output tubes and the ECC40 as the driver, and rolled in the U18/20. And the difference was very noticeable. The HEXFRED has more bass presence and the midrange seems a bit more full and forward. And correspondingly, the U18/20 has less bass presence, with thinner and more airy highs, again the standard GEC sound. But going by memory, compared to the GEC, the HEXFRED seemed to sound something like the Cossor. So I was intrigued....

 

And yes, after rolling in the Cossor, I feel that the tonality of the HEXFRED and Cossor are very similar. As expected, I think the HEXFRED is faster, with a bit more PRAT, but to my ears, this is pretty subtle. And again, I haven't had enough time to try to compare such things as imaging, detail retrieval and transients, much less something like liquidity, but I don't feel that I am missing anything with the HEXFRED.

 

Again, I think I am going to need a good long time to truly understand the sound of the HEXFRED compared to the Cossor. But given that it seems to compare so well with the Cossor, I wanted to report these very early impressions. In my opinion, so far, the HEXFRED is an incredible bargain for $20 plus shipping. (Until Glenn decides to raise the price! lol )

 

Oh, and I should also point out, that for those using 6AS7s in their OTL, the Cossor may well sound slightly different than it does with a quad of 6BL7/6BX7, given the larger voltage drop....

 

Anyway, hope this is useful...


Have you tried an az1 rectifier w/5y3 adapter?

post #13926 of 13934
Quote:
Originally Posted by jhljhl View Post
 

Have you tried an az1 rectifier w/5y3 adapter?

 

No I haven't. I am not familiar with this rectifier, but checking the datasheets, I do not believe the AZ1 can provide enough current to run the OTL. If I understand correctly, at 300V, it can provide at most 100ma. Even running a quad of 6BX7, rather then a pair of 6AS7, this is not enough.....

post #13927 of 13934
Quote:
Originally Posted by gibosi View Post
 
Quote:
Originally Posted by jhljhl View Post
 

Have you tried an az1 rectifier w/5y3 adapter?

 

No I haven't. I am not familiar with this rectifier, but checking the datasheets, I do not believe the AZ1 can provide enough current to run the OTL. If I understand correctly, at 300V, it can provide at most 100ma. Even running a quad of 6BX7, rather then a pair of 6AS7, this is not enough.....


No you will not be able to use the AZ1 in your OTL.

I switched to the AZ4 in the new EL3N amp less voltage drop another 4 volt rectifier with a crazy side pin base.

post #13928 of 13934

The AZ4 puts out 200ma? So perhaps this would work with a quad of 6BL7/6BX7?

post #13929 of 13934
Quote:
Originally Posted by gibosi View Post
 

The AZ4 puts out 200ma? So perhaps this would work with a quad of 6BL7/6BX7?


It would need a crazy adapter but you could wire it to the 3.3 volt for the 3DG4 that is more like 3.5.

not sure it would be worth it though.

post #13930 of 13934

Put a dozen hours or so on those HEXFRED doides gibosi then ear test them again.  The level of detail you'll be hearing will unhinge your jaw for a moment.  :)

post #13931 of 13934
Quote:
Originally Posted by 2359glenn View Post
 

It would need a crazy adapter but you could wire it to the 3.3 volt for the 3DG4 that is more like 3.5.

not sure it would be worth it though.

 

I appears that the 1861 is identical to the AZ4 except that it uses an European B4 base, the same as the FW4/500. And as you know, it just so happens that I have such an adapter. So I think I will give one of these a try. :)  

 

http://www.radiomuseum.org/tubes/tube_1861.html

post #13932 of 13934
Quote:
Originally Posted by Xcalibur255 View Post
 

Put a dozen hours or so on those HEXFRED doides gibosi then ear test them again.  The level of detail you'll be hearing will unhinge your jaw for a moment.  :)

 

Will do. :)

 

From your experience, it would appear that in my OTL, after it is burnt-in properly, the HEXFRED will give me the tonality of the Cossor 53KU, which I really like, and a level of detail perhaps surpassing the GEC U52 / U18/20. For about $20. Not bad. :)

 

But for now, I have four 6BX7 actually manufactured by Tung-Sol that I am itching to try. :)

post #13933 of 13934
Will the HEXFRED (not the Flintstone) work on my OTL @2359glenn?
post #13934 of 13934

Bit of an upgrade on my rig. HD30 DAC wasn't quite what I was looking for, so I sold all of my internal organs and went for an Uber DAC - Bricasti M1.

 

 

Combined with the Glenn 300B the sound is already a step up from the HD30, but a little raw as this DAC is fresh out of the box.

 

Need to put a bunch of hours on this thing and see where it takes me. Also need to sort out my rack tomorrow.

 

EDIT - been running the new DAC for about 2 hours now, and already I am hearing quite a jump in SQ. For those considering going to an Uber DAC, if the rest of your rig can make use of the improved SQ, and your wallet can survive the hefty pounding involved, I highly recommend it. I am just about creaming my panties right now, and this DAC is only going to get better over the next few hundred hours.

 

My first decent DAC - the Auralic Vega - was a good unit. It did most things right, particularly in EXACT mode via USB. But, and for me this was a big "but", the treble could go "glassy" and/or "steely" too often for my tastes. It also was a tad bright to my ears. There was never any confusion that you were listening to a digital source with the Vega.

 

My second DAC, the Hegel HD30, is technically marvelous. Great sound stage, detailed, fast, excellent dynamics ... by any technical measure this is an uber DAC. But, the sound has a hard edge to it that is OK for floor standers, but for headphones it becomes harsh and fatiguing. Some folks say that is a feature with the AKM 4490 chip - "Velvet Sound" it is NOT. I can't say if it is the implementation or the chipset - and really I don't care. The sound irritates my gonads after about 20 minutes to the point where I can't stand it anymore with any headphone I posses. As a HeadFi listening experience, give me the Vega any day.

 

My third attempt at an "endgame" DAC is the Bricasti M1, and so far it looks like a winner. I am getting all the great technical things that the HD30 delivered, but without the hard edge. There is a touch of warmth and musicality there. Early days, but this is solid DAC that does just about everything pretty damn well so far. If it can smooth out a little over the next few days/weeks it will be impressive indeed. Other worthy contenders in this price range - MSB Analog / Meitner MA1 / BADA2 ... etc.


Edited by TonyNewman - Today at 10:02 pm
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