pucho812

tube headphone amp
« on: October 01, 2018, 07:18:01 PM »
looking for a tube headphone amp...

Looking for something with balanced inputs and something that can drive my DT770 headphones.

DIY or not, not too important in this case.
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.


Pip

Re: tube headphone amp
« Reply #1 on: October 01, 2018, 07:23:57 PM »
Not sure if this will fill the bill or not! This is also vast waters with some really expensive solutions available.

For crazy world check out:

https://www.audiogon.com/

For normal people these have gotten good feedback:

http://hafler.com/ha75.php
Pip
New York City
http://geosonixlab.com

ruffrecords

Re: tube headphone amp
« Reply #2 on: October 01, 2018, 07:29:16 PM »
How about this:

https://www.gearslutz.com/board/geekslutz-forum/625201-improved-tube-headphone-amp.html

The open source PCB files are available under the DIY tab of my web site:

www.customtubeconsoles.com

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

pucho812

Re: tube headphone amp
« Reply #3 on: October 01, 2018, 09:00:50 PM »
Not sure if this will fill the bill or not! This is also vast waters with some really expensive solutions available.

For crazy world check out:

https://www.audiogon.com/

For normal people these have gotten good feedback:

http://hafler.com/ha75.php

The hafler looks interesting but also looks way crowded with parts and a lot of solid state.  Maybe I am mis understanding it and it's a hybrid which is not bad. But I will check it out further to see what is what.  as you never know. However I am leaning to have an all tube option.



How about this:

https://www.gearslutz.com/board/geekslutz-forum/625201-improved-tube-headphone-amp.html

The open source PCB files are available under the DIY tab of my web site:

www.customtubeconsoles.com

Cheers

Ian

looking for an all tube option so this looks like a good option. I would Imagine Ian I can just add a 1:1 transformer to have a balanced input?
« Last Edit: October 01, 2018, 09:04:01 PM by pucho812 »
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

ruffrecords

Re: tube headphone amp
« Reply #4 on: October 02, 2018, 02:58:00 AM »
The hafler looks interesting but also looks way crowded with parts and a lot of solid state.  Maybe I am mis understanding it and it's a hybrid which is not bad. But I will check it out further to see what is what.  as you never know. However I am leaning to have an all tube option.



looking for an all tube option so this looks like a good option. I would Imagine Ian I can just add a 1:1 transformer to have a balanced input?

The recommended Sowter transformer can be configured in the correct ratios for a variety of loads:

http://www.sowter.co.uk/specs/8665.php

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

pucho812

Re: tube headphone amp
« Reply #5 on: October 02, 2018, 03:12:46 AM »
thanks Ian...
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

rob_gould

Re: tube headphone amp
« Reply #6 on: October 02, 2018, 02:10:33 PM »
Something by Schiit Audio perhaps?

http://www.schiit.com/products/mjolnir-2

Rob Flinn

Re: tube headphone amp
« Reply #7 on: October 02, 2018, 03:54:29 PM »
Something by Schiit Audio perhaps?

http://www.schiit.com/products/mjolnir-2

A rather unfortunate company name perhaps .....
regards Rob

dmp

Re: tube headphone amp
« Reply #8 on: October 02, 2018, 05:56:50 PM »
How possible would it be to add a DA converter so the headphone amp could directly connect to a phone?

gyraf

Re: tube headphone amp
« Reply #9 on: October 03, 2018, 05:35:53 AM »
Our own archives, some 14 years ago: https://groupdiy.com/index.php?topic=1840.0

Jakob E.
..note to self: don't let Harman run your company..


pucho812

Re: tube headphone amp
« Reply #10 on: October 04, 2018, 10:58:18 AM »
Something by Schiit Audio perhaps?

http://www.schiit.com/products/mjolnir-2

I have heard their solid state stuff, very nice for the price tag.

Our own archives, some 14 years ago: https://groupdiy.com/index.php?topic=1840.0

Jakob E.

Yes did a search first. that thread came up and all the links are dead.  but I do have your design jackob.
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

Re: tube headphone amp
« Reply #11 on: October 04, 2018, 05:45:26 PM »
I made a headphone amp years ago from an old bakelite radio chassis , very simple ,just 2xEL84 ,triode connected , power and output transformers ,and two big chokes ,plenty of resistive smoothing as well . 10k stereo pots on the grid to the EL84's  ,a pair of very small 4 ohm output transformers salvaged from a Dansette record player , not sure if balanced input is a prerequsite , but in a very simple single ended topology ,theres no real benefit apart from the abillity to run longer cables to it . Triode connected EL84 is just under 2 watts ,but still very adequate to power any phones you throw at it .The 10 volts or so required by the input to the EL84 is easily supplied from monitor or aux outputs . Sure I could get better performance with more gain stages and feedback ,but its the very gradual overload that I like in this simple arrangement, no matter what you throw at it will never distort violently like op amps ,very very important to me ,more so than actual measured performance in this application . I also have it wired so if no phones are plugged in both outputs are routed to the internal speaker , makes a good small speaker reference  too .
When not in use as Hp amp I have the amp on the tweeters of some mini monitors ,theres no massive volume ,but thats not required , and for moderate sociable music levels its perfect .
I know I know , someone will pop up and say thats inneficient, power hungry and over the top for the job , but simplicity wins out for me anyday . Electric power is cheap ,and good  EL84's  will be around a long long  time yet. Ive got years out of the current tubes in there , a set of mil spec chinesse made .

alexc

Re: tube headphone amp
« Reply #12 on: November 20, 2018, 03:38:32 AM »
Nothing wrong with triode connected el84 + output transformer   ..   for headphone amp duties! 

You can hunt a bit and get some great performers from the old russian types too   ..  6p14p, 6p15p

I prefer 6V6 trioded myself, and that low heater is such a killer feature for a 10W plate. It beats many other tubes for hi-fi and is (was) very affordable. I haven't measured an old russian type, but I will one day.

The main thing, as you mention,  is a really quiet psu - so I like a lot of choke(s) for filtering or a regulated HV module. 

....

With transformer balancing of the inputs,  as well modest sizing of a single chassis, hum could be a problem. In this case, I would definately build a seperate psu chassis.

It's worth the while doing that seperation of psu and signal units particularly if one is going down the s-s regulated psu path.

One can even use modern debalancing chips if one can source a suitable psu traffo - ie. a toroid with  an additional 17V bipolar winding.   

Otherwise, good shielding all round! 

Of course, you can always use the simple method of driving a potentiometer connected across the phases of the balanced input signal  ..  api style   ;D

...

I'm really liking sand-state support for tubes, certainly in the psu but also in and around the signal bottles   ;D 

I'd very much like to hear some 6DJ8 + mosfet amp - get that wonderful signature to the voice coil without further degradation.

I'm doing something like that now, with some 'New York Dave's One Bottle Preamplifier' modules and some JLH Class A bjt 24V headphone amp modules. I'm just working to blend them nicely together along with a seperate sand-state reg PSU - I have signal transformers all around this thing.....    Early indications are pretty positive ...  for such simple circuits ...

I'm getting more of 'that feeling' from them than my Behringer Quad Headphone Amp   .. but I'm not disrespecting Behringer at all. I think they make some pretty good stuff. The Beh is  fine for most of my 'live' monitoring needs and is a 'standard' of sorts. Also good for 'test bench' duties, driving transformers and amp stages and such.

But I do mostly use the Beh as 'distribution amps', driving a seemingly endless array of tube amps+speakers+fx :)

It depends on what you are looking for. Horses for courses, I guess.

I'd also like to try some direct-heated types in the role of a single-ended transformer coupled headphone amp  ..  a few types come to mind :)

My 'most used' headphone amp is a simple resistive attenuator off the output transformer secondary taps of a small el84 push-pull integrated hifi amp. I use it all the time and it sounds pretty good and quiet. Of course, I modded it.

..

Then there's also the output-transformer-less otl style of headphone amp  ...  here is an 'aikido' headphone amp that I think could be very interesting and quite do-able.

Of course, transformer coupled designs might be more appropriate to very expensive headphones ..  for iso reasons.  I have read that otl designs might thump under certain fault conditions..
« Last Edit: November 20, 2018, 05:41:42 AM by alexc »
I ping therefore I am

alexc

Re: tube headphone amp
« Reply #13 on: November 20, 2018, 04:05:02 AM »
I believe there is an 'aikido octals headphone amp with 6sn7-6bx7'    OTL   pcb design  floating around out there, that I think could be very interesting and good performing ...  there were some good quality pcbs for it on ebay ..   the schemo was very straight forward and the psu looked quite well designed, regulated etc.

And here's the schemo   ..
« Last Edit: November 20, 2018, 04:58:40 AM by alexc »
I ping therefore I am

alexc

Re: tube headphone amp
« Reply #14 on: November 20, 2018, 04:10:23 AM »
I also recall an intriguing design along otl lines, *but*  using an active plate load with a 6AS7 low-mu, high current  gain stage   .. an el34 triode connected, no less!

I remember it made quite an impression on me!  I'll look see if I can find the whole article but here is the jist of it ..
« Last Edit: November 20, 2018, 04:55:31 AM by alexc »
I ping therefore I am

alexc

Re: tube headphone amp
« Reply #15 on: November 20, 2018, 05:47:56 AM »
Just to finish up on, here is the 'Eleven Tube Headphone Amp'   :)

It only needs 7A of heater!
I ping therefore I am

Re: tube headphone amp
« Reply #16 on: November 25, 2018, 11:05:19 AM »
Some nice ideas in there Alex , cathode output would be nice to try ,
EL34's for HP amp looks great , The JLH class A is another really nice solution .
12BH7 is another valve that could have a use here similar to the 6bx7 but 9 pin mini .

pucho812

Re: tube headphone amp
« Reply #17 on: January 07, 2019, 09:19:12 PM »
after I picked up the made in china headphone amp for $99.00 I believe I found what I was looking for.
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.


 

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