Tube Headphone Amp

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jtwrace

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Tube Headphone Amp
« on: 28 Jun 2014, 01:45 pm »
Do you think you will be coming out with another headphone kit any time soon?  If so, I request a fully balanced model and one that can drive hard to drive  cans.   :)

hagtech

Re: Tube Headphone Amp
« Reply #1 on: 5 Jul 2014, 04:38 am »
I haven't kept up with the latest in headphones.  Describe "hard to drive".  What impedance and power level are required. 

jh

jtwrace

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Re: Tube Headphone Amp
« Reply #2 on: 5 Jul 2014, 12:07 pm »
I haven't kept up with the latest in headphones.  Describe "hard to drive".  What impedance and power level are required. 

jh
Mine are 50 ohm. 90dB/mW

hagtech

Re: Tube Headphone Amp
« Reply #3 on: 6 Jul 2014, 08:12 pm »
That doesn't seem so difficult.  Unless you're trying to use a cathode follower, which would not be particularly clever.  Heck, my CASTANET easily drove 32 ohmers.

I was worried some of the new headphones required a very high voltage signal. 

jh

jtwrace

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Re: Tube Headphone Amp
« Reply #4 on: 6 Jul 2014, 08:25 pm »
That doesn't seem so difficult.  Unless you're trying to use a cathode follower, which would not be particularly clever.  Heck, my CASTANET easily drove 32 ohmers.

I was worried some of the new headphones required a very high voltage signal. 

jh
OK.  So what are the options?   :green:

hagtech

Re: Tube Headphone Amp
« Reply #5 on: 8 Jul 2014, 05:26 am »
Maybe something that borrows pieces of the CASTANET.  It was an expensive assortment of parts, though.  Will require some re-thinking for getting the cost down to where a DIYer would want it. 

jh

JohnR

Re: Tube Headphone Amp
« Reply #6 on: 8 Jul 2014, 11:08 am »
Castanet II on KickStarter, Jim?

What about moving away from parafeed (and costs associated with the iron) and looking into a little direct-coupled push-pull OTL specifically for headphones. 6c19pi?

hagtech

Re: Tube Headphone Amp
« Reply #7 on: 13 Jul 2014, 03:19 am »
I'm not sure how to get impedance low enough with OTL without resorting to feedback.  A 6080 tube in parallel maybe.  Just doesn't feel right to me.  I'll have to think about it. 

jh

jostber

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Re: Tube Headphone Amp
« Reply #8 on: 25 Sep 2014, 04:25 pm »
Any news on this? Would be very interesting.


hagtech

Re: Tube Headphone Amp
« Reply #9 on: 27 Sep 2014, 03:14 am »
No news.  Maybe 2015.  Maybe 2016...

jh