Transformerless Tube Amp - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 19th May 2009, 07:25 AM   #1
Tarzan is offline Tarzan  Belgium
diyAudio Member
Tarzan's Avatar
Join Date: May 2004
Location: Genk
Default Transformerless Tube Amp

I recently stumbled accross some old magazines from the early sixties.
They had a small article on transformerless power amps.
I did a quick search on the net and found the following pattent extract:
E.H. Krohn Power amplifier US Pattent 3.092.783

Here I read that the load is 600 Ohms; a bit unpractical nowadays.
Outout Power is more then adequate.

I keep on searching further and like to know if any one had or has experiance with this kind of amplifiers.

The field of usage is mainly Musical Instrument amplification. No HiFi.
How will this amp behave under the harsh road and stage conditions?

  Reply With Quote
Old 19th May 2009, 07:45 AM   #2
diyAudio Member
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
These transformerless amps are usualy refered to as OTL amplifiers. There are several discused in this tube forum that
can drive an 8 ohm load just fine. Just do a search for OTL and read to your heart's content.
  Reply With Quote
Old 19th May 2009, 07:55 AM   #3
Tarzan is offline Tarzan  Belgium
diyAudio Member
Tarzan's Avatar
Join Date: May 2004
Location: Genk
Yes, OTL, I forgot the abbreviation...
I'll do a search.
Thanks for the so obvious tip.
  Reply With Quote
Old 17th June 2009, 08:33 PM   #4
diyAudio Member
merlin2069er's Avatar
Join Date: Sep 2008
Location: Toronto
Blog Entries: 1
Send a message via MSN to merlin2069er
Check out Bruce's amp over at Transcendent.

I picked up his audio book from the library Audio Reality - it's a good read, with plenty of his projects in it.
  Reply With Quote
Old 17th June 2009, 11:47 PM   #5
diyAudio Member
Steerpike's Avatar
Join Date: Jan 2006
Location: Johannesburg, South Africa
Philips (Holland) has a line of very good OTL amps (AG9014, AG9015, AG9018) and matching 800 Ohm hi-fi speakers (AG5005, AG5040)
Steerpike's Toybox
  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
transformerless amps? zenmasterbrian Power Supplies 107 16th September 2006 10:48 AM
transformerless amp help plz ... Ahmad_tbp Tubes / Valves 10 26th December 2005 06:54 PM
Transformerless Amp - Possible? lgreen Solid State 7 27th June 2003 10:57 PM

New To Site? Need Help?

All times are GMT. The time now is 12:12 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