Vacuum Tube Headphone Amplifiers - Discussion

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hagtech

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Re: Vacuum Tube Headphone Amplifiers - Discussion
« Reply #20 on: 18 Sep 2019, 05:09 am »
Lately I've been using HD600, DT990PRO, SR125e, and Sundara... 

The OTL amps were of my own design; prototypes being tested in the lab.  I don't recall a lot of specifics, as this was 2007, when I ended up selecting an OPT circuit instead, using a 6H30.  Great tube for the job! 

The problem I mention is specific to cathode follower type circuits.  Don't get me wrong, I use them all the time.  Every one of my tube phonostage designs employs one!  I loved the SRPP in my linestage too.  But you have to be careful, as they do tend to go unstable if not operated properly.  Hence, my lengthy diatribe.  Some designs will be better implemented than others.

If you want to see / hear what I am talking about, put a capacitor (say 0.001uF) on the output of your OTL amplifier.  It will be an exaggerated condition, but useful to demonstrate what happens with difficult loads or a marginally stable circuit design.

jh

adydula

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Re: Vacuum Tube Headphone Amplifiers - Discussion
« Reply #21 on: 18 Sep 2019, 11:39 am »
jh,

Interesting....and thanks....I will try the cap experiment when I get the time.

Alex


wushuliu

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Re: Vacuum Tube Headphone Amplifiers - Discussion
« Reply #22 on: 19 Sep 2019, 08:15 pm »
Surprised you haven't tried the Project Sunrise III/Harmony amps. My Sunrise has been up and running for about a month or so and am very impressed. I have a bunch of 12bh7s laying around so I figured it would be a good fit without having to spend money tube rolling. Stock it sounds very good but I did my own little tweaks and parts selection. Depending on the tube the presentation is similar to the T2, APPJ PA1502A, or Asgard 3, even in between. I consider it better than all 3. Currently using EH 12bh7 which seems to have lower noise and better linearity than my NOS versions and the stock 12AU7 it comes with. Some great guitar crunch and drive. ZZ Top never sounded better!

adydula

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Re: Vacuum Tube Headphone Amplifiers - Discussion
« Reply #23 on: 19 Sep 2019, 08:26 pm »
Ha!

I have looked at this but it never went anywhere!! Well after I heal up spending $999 on Focal's I will have to revisit this one!!

Always room for another amp or two!

Thanks for the info, better than all three!! Thats a strong testimony for sure....

I think you like it!

Alex

 :lol:

Unison845

Re: Vacuum Tube Headphone Amplifiers - Discussion
« Reply #24 on: 20 Sep 2019, 03:29 am »
My DHT 845 tube amplifier, for driving the STAX Electrostatic Headphones.







adydula

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Re: Vacuum Tube Headphone Amplifiers - Discussion
« Reply #25 on: 20 Sep 2019, 12:46 pm »
Gosh thats a beautiful site!!

All those tubes!!!

Big Smile here!!

Alex

jawks

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Re: Vacuum Tube Headphone Amplifiers - Discussion
« Reply #26 on: 27 Sep 2019, 03:02 pm »
I've owned a Decware CSP2 for about 5 years now.  I bought it used for the original owner and use it mainly with my vinyl setup, which is also tube amp driven.  I unfortunately haven't done as much listening to vinyl on headphones lately, but I hope to change this in the weeks to come.  I really like the CSP2 and it functions nicely as a preamp, too. 

Albert

adydula

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Re: Vacuum Tube Headphone Amplifiers - Discussion
« Reply #27 on: 28 Oct 2019, 11:43 pm »
Well back to the Bottlehead Mainline in the Alex Amp Rotation Series!!

I did a few comparisons with some solid state amps, with careful level setting with the SPL meter..

and its amazing how close the tube Mainline is in sound to other SS amps....

For a tube amp its using some VERY linear tubes (when properly biased) and has a marvelous sound stage.

Very silent...great articulation.....Cowboy Junkies stuff sounds so eerily good...haunting guitar sounds to die for...

Its one of the few amps that I can use the balanced outs to the Focal Clears....

This amp I just noticed (and posted in the hot deals) is dropped from $1299 to $999 they indicate they have only 2 left??

Its a more complex build but not that bad...just lots of wires and cables to trim to length and lots of multi ganged switches in the stepped
attenuator etc...easy to screw up if your not paying attention..

This is one amp I would call a statement amp or even a reference amp IMO..its that good and one I would never part with willingly!

Love to build another one just for the exercise!

Alex