ECL82 PP "reference" amp - 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 19th October 2007, 05:38 AM   #1
Tyimo is offline Tyimo  Hungary
diyAudio Member
 
Join Date: Nov 2002
Location: Hungary
Default ECL82 PP "reference" amp

Hi!

I would like to buid a simple and good PP amp for reference and to listen and demonstrate the sound of the PP tube amps.

I found a couple (or 3-4-5 ) of interesting circuits, but I don't know which one is the best....

Here are the competitors:

- Mullard 7W classic amp
- Audio Innovation 300 Mk2
- Svetlana 6BM8 (from Sansui)
- No name (suggested by Sjef)
- Rainer zur Linde amp

Has somebody experiences with these amps?
Which one can operated in Ultra Linear mode and is it worth it?
For the output transformator I thought on the Hammond 1620.

Greets:

Tyimo

Here is the Mullard:
Attached Images
File Type: jpg ecl82-mullard_pp.jpg (47.2 KB, 1254 views)
  Reply With Quote
Old 19th October 2007, 05:41 AM   #2
Tyimo is offline Tyimo  Hungary
diyAudio Member
 
Join Date: Nov 2002
Location: Hungary
Here is the Audio Innovation300Mk2:
Attached Images
File Type: jpg ai300mk2.jpg (47.8 KB, 1144 views)
  Reply With Quote
Old 19th October 2007, 05:42 AM   #3
Tyimo is offline Tyimo  Hungary
diyAudio Member
 
Join Date: Nov 2002
Location: Hungary
Here is the Svetlana 6BM8-("Sansui"):
Attached Images
File Type: gif sv6bm8_04.gif (26.6 KB, 1141 views)
  Reply With Quote
Old 19th October 2007, 05:44 AM   #4
Tyimo is offline Tyimo  Hungary
diyAudio Member
 
Join Date: Nov 2002
Location: Hungary
Here is the No name (by Sjef):
Attached Images
File Type: jpg ecl82pp.jpg (83.0 KB, 1106 views)
  Reply With Quote
Old 19th October 2007, 05:45 AM   #5
Tyimo is offline Tyimo  Hungary
diyAudio Member
 
Join Date: Nov 2002
Location: Hungary
Here is the Rainer zur Linde amp:
Attached Images
File Type: gif ecl82-rzl.gif (21.5 KB, 1066 views)
  Reply With Quote
Old 19th October 2007, 06:13 AM   #6
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
None of the above (really onlt variations on 2 topologies).

Yves & Gingertube worked out an ECL86 PP with a Long Tail Pair loaded by a CCS and RH style (plate-to-plate) feedback.

Hey Planet_10 (and others)

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 19th October 2007, 08:13 AM   #7
diyAudio Member
 
Shoog's Avatar
 
Join Date: Aug 2002
Location: Eire
I'm having really good result with the attached schematic of my own design. I'm using it as a headphone amp, but by choosing the correct output transformer you should hget good performance with speakers.
Fully differential from input to output. No cathode bypass on the input LTP. Differential output stage with self balancing bias circuit.

Based on Gary Pimms Tabor circuit. I love listening to it.

PS. R11 should be 800R.

Shoog
Attached Images
File Type: jpg ecl82 push pull headphone amplifier.jpg (70.0 KB, 1058 views)
  Reply With Quote
Old 19th October 2007, 02:54 PM   #8
diyAudio Member
 
Tubes4e4's Avatar
 
Join Date: Jul 2005
Location: Leverkusen
Hi Tyimo,

I would suggest to add the German Klein+Hummel Telewatt VS55 circuit to your list. Klein+Hummel (still) is a producer of broadcasting & studio gear and back in the old times also had a line of amps for demanding private customers.

I once had such a VS55 on my bench for restauration, which thaugth me a *lot* on professional circuit design; it has some very interesting aspects almost nobody cares about nowadays for some unknown reasons.

But you can find pictures, description and schematic here at this link.

Sound is outstanding for an amp using "sh*tty TV tubes" like ECL82/6BM8, I can asure you.

A problem for your project will be that the Hammond OPTs you have in mind quite likely donīt come anywhere close to the quality of the OPTs like being used in a K+H VS55 amp or comparable gear. In this regard, you should use really good OPTs in the first place when heading for a "reference" class project

Regards,

Tom
__________________
If in doubt, just measure.
  Reply With Quote
Old 19th October 2007, 02:56 PM   #9
Tyimo is offline Tyimo  Hungary
diyAudio Member
 
Join Date: Nov 2002
Location: Hungary
Thanks Dave and Soog!

Quote:
None of the above (really onlt variations on 2 topologies).
Dave, sorry, but what do you mean?? Did you answer for this question: "Has somebody experiences with these amps?" or for this: "Which one can operated in Ultra Linear mode and is it worth it?"

Do you suggest this:

Greets:

Tyimo
Attached Images
File Type: jpg giantkiller.jpg (87.9 KB, 927 views)
  Reply With Quote
Old 19th October 2007, 06:59 PM   #10
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally posted by Tyimo
Do you suggest this:
yes.

I have a donor downstairs & that is what i'm going to build. (but in pentode mode -- i don't have UL OPTs

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  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
Development of a "reference" class D starting point johanps Class D 607 4th January 2006 07:10 AM


New To Site? Need Help?

All times are GMT. The time now is 08:05 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2