Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki 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

Mullard 20W Amp
Mullard 20W Amp
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 28th November 2004, 04:45 PM   #1
KLS is offline KLS  United States
diyAudio Member
Join Date: Nov 2004
Location: Nashville,TN
Default Mullard 20W Amp

Just wondering if anybody had tried to build the 20 watt amp in the "Mullard, Tube Circuits for Audio Amplifiers" book. I am thinking about building this but would like some insight as to the sound form someone who has built it.

  Reply With Quote
Old 28th November 2004, 05:40 PM   #2
Family_Dog is offline Family_Dog  South Africa
diyAudio Member
Family_Dog's Avatar
Join Date: May 2004
Location: North Western Province of South Africa
Send a message via ICQ to Family_Dog

There are 11 pages referring to this amplifier starting here:


And yes, some of us have built this, and enjoying it too! I'm listening to two of them as I type this.

Vintage Tube Hobby Group:
  Reply With Quote
Old 8th December 2004, 06:11 PM   #3
shermanr is offline shermanr  Puerto Rico
diyAudio Member
Join Date: Dec 2004
Location: PR
The 5-20 amp is a very good design that sounds excellent.
My only advice would be to pay close attention to the mains transformer. There are not too many out there that will work well without some tweaking of the original PSU circuit topology.

The P782S Dynaco replacement transformer is probably as close as one can get to the best 5-20 Mains transformer. You can see this at the triode electronics web site. The PSU Choke is also not easy to find with 200 Ohms resistance at 10 H, 180 ma.

I am presently looking at ordering a technically exact Hammond custom transformer and choke for my 5-20's. If I do decide to order several you may just be in luck to buy them from me.

You can check out my 5-20 story at www.shermanaudio.com

Good luck...
  Reply With Quote


Mullard 20W AmpHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Mullard 5-20 JDeV Tubes / Valves 137 17th February 2010 05:53 PM
The Mullard 3-3 atnaat Tubes / Valves 8 21st May 2009 02:54 AM
Another Mullard 5-20. GeirW Tubes / Valves 3 30th November 2004 01:45 PM
My Mullard 5/20 billinchile Tubes / Valves 25 14th October 2004 10:16 PM
Mullard 5-20 again icebear Tubes / Valves 3 16th December 2003 10:01 AM

New To Site? Need Help?

All times are GMT. The time now is 09:42 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio