Any opinions on the ECC81? - 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 5th July 2004, 04:41 PM   #1
diyAudio Member
Join Date: Jun 2004
Location: East Anglia
Default Any opinions on the ECC81?

I am considering using an ECC81 (12AT7) in the second stage of a DIY phono preamplifier. The main reason for considering this type is simply that I've got one in the drawer. However, it looks like the ECC81 is not as frequently used as the ECC83 (12AX7) or ECC88 (6DJ8) so I thought I'd ask you: have you got any personal experience with the ECC81? What does it sound like?
  Reply With Quote
Old 5th July 2004, 04:49 PM   #2
dhaen is offline dhaen  Europe
diyAudio Moderator Emeritus
dhaen's Avatar
Join Date: Jun 2002
Location: U.K.
Have a look at this thread
  Reply With Quote
Old 6th July 2004, 08:10 AM   #3
diyAudio Member
Join Date: Jun 2004
Location: East Anglia
Default Perhaps I wasn't specific enough...

I did read that thread. My question is not whether they CAN be used. Of course they can, and it should't be too difficult to bias them properly to make a decent amplifying stage.

What I was hoping to hear were opinions of people (if any) who have actually done this and their subjective opinion on the result.
It's just that this tube doesn't seem to be as obvious a choice for an amplifier stage as the ECC88 or ECC83. Maybe it's just overlooked - maybe it doesn't sound particularly good. This is what I was trying to find out about.

I suppose I might just need to try and use my own very subjective ears.
  Reply With Quote
Old 6th July 2004, 08:33 AM   #4
dhaen is offline dhaen  Europe
diyAudio Moderator Emeritus
dhaen's Avatar
Join Date: Jun 2002
Location: U.K.
They sound fine. I seem to remember they are used in the front end of the Bottlehead Paramours, although they use a CCS load to improve performance (hum and distortion).
Like many of these double triodes, it was originally intended for RF work, but they work well at AF too

You might find some more mentions with the search function.
  Reply With Quote
Old 6th July 2004, 11:56 AM   #5
diyAudio Senior Member
fdegrove's Avatar
Join Date: Aug 2002
Location: Belgium

The VTL phonopreamps used the ECC81/12AT7 quite often as a second stage tube to take advantage of the high mu and lowish Ri.

While I find Manley overused the tube, giving his gear a sonic fingerprint I tend to attribute partly to the ECC81, using a single ECC81 in a phonopreamp would not have that kind of impact IMO.

  Reply With Quote
Old 6th July 2004, 11:57 AM   #6
SY is offline SY  United States
diyAudio Moderator
SY's Avatar
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 2
The 12AT7's flaw is noise performance- it's fine for line stage use, but can be a bit dicey in the first hole or two of a phono stage. But once you've got the signal level up a bit, no problems, the tube is pretty linear in the right circuit. I've got a reworked Berning TF10 here that uses the 12AT7 in holes 3 and 4 of a 4 tube phono stage and it seems to work just fine- most of the preamp's noise comes from the first stage (12AX7-based).
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
  Reply With Quote
Old 7th July 2004, 01:56 PM   #7
Armin is offline Armin  Germany
diyAudio Member
Join Date: Jul 2004
Location: near cologne
Default ECC81 is fine

we have a lot of ECC81 here in germany, so I tried them in
pre and power amps.
Half of a ECC81 is EC92, for info.
I bild a phono riaa, passive, with half ECC81 in the input, and a half ECC82 or E80CC second stage.
With good results, but some ECC81 are microfonic sensible.
I tried also a ECC85 as replacement for ECC81, this works
fine, but a little less gain.
Also, I used ECC81/85 in as phase inverter/ driver for a EL84PP
amp. But you can find a lot of classic tube amp designs wich use
a ECC81, Excample: Dynacord Eminent.
If you want my phono schematic, please reply.
regards from germany
  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
7 pin ECC81. Cassiel Tubes / Valves 9 16th February 2009 02:00 PM
ECC81 Tobruk Tubes / Valves 6 25th April 2007 02:47 PM
ecc81 gianis Swap Meet 0 12th June 2006 08:44 PM
ECC81 or 83 or 85 or 88 ??? Bernhard Tubes / Valves 1 26th December 2003 03:57 PM
ECC81 or CV4024? Jay Tubes / Valves 8 10th April 2003 05:51 PM

New To Site? Need Help?

All times are GMT. The time now is 12:18 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Đ1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2