Headphone amp with tube PS - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Headphone Systems
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Headphone Systems Everything to do with Headphones

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 29th January 2007, 05:47 PM   #21
diyAudio Member
dsavitsk's Avatar
Join Date: Jan 2005
Location: Hartford
Originally posted by Phergus_25
Thanks for the new onslaught of info. I was hoping that you, dsavitsk, would jump in here.
I'd be careful what you wish for. I'm really just a the poser here.

Anyhow, the Mapletree uses those hammond transformers at 2400:32, and while scaling up a transformer like that often rolls off the bass, the word on the street is that the bass is still quite good. I am guessing that a few extra ohms is okay, or that putting a resistor in parallel with your phones to bring the load down to 25 or so would also be okay. However, how they will respond in a parafeed design is unknown.

So, the basic schematic I am tinkering with there is like http://www.nutshellhifi.com/library/Pix-C.gif except using LEDs to do the biasing, and placing the cap between B+ and the transformer, rather than between the ground and the transformer (you could do it like in the schematic, but this seemed like a safer option.)

The Specos are used by a certain kit manufacturer. I think they are used as autoformers and that the secondaries are ignored. If they work that way, then using them in a design like the espressivo amp may be an option.

I have not so much as breadboarded either of these yet, so I have no idea if they will work, let alone sound good. But, what I like is that they can be built very cheaply, but by upgrading the transformers and the one cap, they could conceivably turnin to good performers.

As I said before, I do think that looking into a transformer coupled Aikido is a good option. I've not heard an Aikido, but everyone here seems to like the circuit a lot. If those Hammonds work at the impedance you need, then it shrinks the coupling cap quite a bit too so you might be able to get rid of the electrolytic. The Mapletree schematics are on page 4 of this: http://hollowstate.netfirms.com/mapletreebranches1.pdf and will give you some ideas how to accomplish this.

  Reply With Quote
Old 30th January 2007, 11:31 AM   #22
diyAudio Member
Join Date: Nov 2006
Send a message via AIM to Phergus_25 Send a message via Yahoo to Phergus_25
Well, there it goes.
I just picked up my phones and started up my HP rig for the first time in a few days and I'm SOOO happy with it.
I think I am going to read up on design and at some point make another amp, maby in a month or two, but for now Im set.
I think when I do make one Im going to make an Aikido with normal OTL and then read up on how to incorperate the transformers.
I still plan to order the PCB in a few days just so that I will have some thing to read up on and its alot easier for me to visualize when I have something in hand.
Im sure Ill be back in a month or so, depends on how much extra cash I have laying around.
PS- thanks again guys.
  Reply With Quote
Old 20th April 2007, 02:12 AM   #23
diyAudio Member
dsavitsk's Avatar
Join Date: Jan 2005
Location: Hartford
I babbled a bit about this project in this thread, so I thought I'd post an update. It is basically an Espressivo with lots of cheap parts.

Sound is quite good, bass could be better, but for a $4 output transformer it's not bad at all ...

Click the image to open in full size.

Lots of details at: http://www.ecp.cc/less-pressivo.html
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tube Headphone Amp sorenj07 Swap Meet 6 12th February 2008 02:35 AM
Tube Headphone Amp? Dougie085 Headphone Systems 22 3rd November 2007 09:10 AM
Octal tube as headphone amp output tube yagoolar Headphone Systems 6 25th November 2006 09:11 PM
My new tube headphone amp MCLL Headphone Systems 7 24th July 2005 08:44 AM
How to use one tube instead of another in this headphone amp? Pentium100 Headphone Systems 5 17th January 2005 03:00 AM

New To Site? Need Help?

All times are GMT. The time now is 02:30 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2