AudioCircle

Other Stuff => Archived Manufacturer Circles => Hagerman Technology => Topic started by: jtwrace on 28 Jun 2014, 01:45 pm

Title: Tube Headphone Amp
Post by: jtwrace 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.   :)

Title: Re: Tube Headphone Amp
Post by: hagtech 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

Title: Re: Tube Headphone Amp
Post by: jtwrace on 5 Jul 2014, 12:07 pm

Quote from: hagtech 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

Mine are 50 ohm. 90dB/mW

Title: Re: Tube Headphone Amp
Post by: hagtech 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

Title: Re: Tube Headphone Amp
Post by: jtwrace on 6 Jul 2014, 08:25 pm

Quote from: hagtech 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

OK.  So what are the options?   :green:

Title: Re: Tube Headphone Amp
Post by: hagtech 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

Title: Re: Tube Headphone Amp
Post by: JohnR 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?

Title: Re: Tube Headphone Amp
Post by: hagtech 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

Title: Re: Tube Headphone Amp
Post by: jostber on 25 Sep 2014, 04:25 pm

Any news on this? Would be very interesting.

Title: Re: Tube Headphone Amp
Post by: hagtech on 27 Sep 2014, 03:14 am

No news.  Maybe 2015.  Maybe 2016...

jh