20 Watt SE. I had found it. - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

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
Reply
 
Thread Tools Search this Thread
Old 7th April 2006, 10:26 PM   #1
diyAudio Member
 
Join Date: Jan 2005
Location: Denmark
Default 20 Watt SE. I had found it.

Hello

As You all know am I looking for a 25 Watts SE amplifier.

After help from You here at the forum, I had decided to build 4 pcs clones of Goliath from Triode Dick. 2 to my friend and 2 to me.

I can also see the new Hammond 1638SEA OPT fit to the 211 tube.

Does any had build a Goliath clone? Sound?

I have a few problems and the first is where can I buy D3a tubes?

Regards

Benny
  Reply With Quote
Old 7th April 2006, 10:38 PM   #2
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
http://www.ahrens-audio.de/tubes.htm
  Reply With Quote
Old 8th April 2006, 06:33 AM   #3
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Hi, I forgot this one

http://www.acoustic-dimension.com/
  Reply With Quote
Old 8th April 2006, 03:06 PM   #4
diyAudio Member
 
audiomanics's Avatar
 
Join Date: Oct 2004
Find some on eBay, frequently....good replacements: 6922, 7788 (even very nice Amperex PQ's) for just a few bucks..
  Reply With Quote
Old 8th April 2006, 05:18 PM   #5
diyAudio Member
 
Miniwatt's Avatar
 
Join Date: Nov 2004
Location: Den Haag
Hey, that's great!! I'm going to build them too -once my turntable and pre-amplifier are ready )

Do you understand Dutch? If not, there's a firm in Holland that quite closely cooperates with Triode Dick, they have complete transformer sets for this amp: www.ae-europe.com. They also have silver output transformers for this project (). Without them, power xformers and chokes are about 300 I recall..

I'm not so worried about finding those d3A's, I'm more concerned with those EY500A rectifiers..

Keep us posted about your project, I'm very curious about your experiences!

Good luck!

P.S. 211's are great!!
  Reply With Quote
Old 8th April 2006, 06:27 PM   #6
diyAudio Member
 
Join Date: Jan 2005
Location: Denmark
Hello

No I can't dutch.

If I can't find the EY500A's I have some 4 kV diodes I can use. Not optinal but better than nothing.

I will first try the Hammon OPT and after that change to better.

Benny
  Reply With Quote
Old 8th April 2006, 07:41 PM   #7
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Try and translate with this - most of it gets understandable

http://world.altavista.com/
  Reply With Quote
Old 9th April 2006, 07:13 PM   #8
diyAudio Member
 
Join Date: Jan 2005
Location: Athens
I don't want to discourage you, but this amp cannot produce more than 12 watt (with 1000v at the plate). The only way to get such power from a 211 at plate voltages around this, is driving the grid in the positive region, supplying grid current.

The circuit you pointed uses a coupling capacitor, which will rectify your signal and create horrible distortion. You need a direct coupled cathode follower or an interstage transormer to provide the needed current.

By the way: One 5687 cathode follower with 8mA cannot drive the 211 in the positive region, despite the "ongaku" shematics that you can find in the net.
You need at least 15mA anode current for the driver (e.g 2 sections 5687 in parallel). I don't believe that the original ongaku has such a big mistake, this simpy cdoesn't work.

Greetings
Konstantinos
  Reply With Quote
Old 9th April 2006, 09:49 PM   #9
diyAudio Member
 
Join Date: Jan 2005
Location: Denmark
Hello Konstantinos

Maby correct but now I had made some surfing about "Ongaku".

It seems that they using a 211 to drive the output tube (also 211).

I had attached Audionote diagram.

continue....
Attached Files
File Type: pdf 211se.pdf (24.0 KB, 166 views)
  Reply With Quote
Old 9th April 2006, 10:06 PM   #10
diyAudio Member
 
Join Date: Jan 2005
Location: Denmark
Continued

I also found a schematic where they using a smaller driver tube.

http://www.diyparadiso.com/proj/uesugi.htm

I think i will rise to 1200 volt and I will use tube rectifiers ( EY500A ). I have some on stock.

I change to 10k OPT an 70 mA current.

Comments wanted

Benny
  Reply With Quote

Reply


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
I Found You! Grasp Introductions 4 12th December 2008 08:54 PM
Look what I found in my new RCD-971! pureh2o Digital Source 3 29th April 2008 08:11 PM
found DIY amp - now what? rickl Tubes / Valves 3 5th January 2006 06:09 AM
found... EDY Digital Source 1 5th August 2003 09:49 AM
I found you! Fusor Introductions 6 24th May 2003 11:05 PM


New To Site? Need Help?

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


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2