Audio Note Preamp Circuit a good guess... - 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 28th April 2004, 02:25 PM   #1
Previously: Kuei Yang Wang
Join Date: Nov 2002
Default Audio Note Preamp Circuit a good guess...


On a regular basis people are asking for the transformer coupled linestage in the AN UK Preamp's and DAC's. As far as I can make this out from Schematics and eductaed guesses. I am not 100% on resistor values, if someone would look it up closer we could correct this.

The output Transformer would be similar (but usually not identical) to the Audio Note UK Trans-027 available through the usual sources for AN DIY Parts, Capacitors Black Gate (the PSU decoupling is part of the PSU PCB) and resistors AN Tantalum. The PSU would appear to be LCLC then split between Channels LC/LC and RC/RC (last RC visible in schematic) acounting neatly for 3pcs 100uF+100uF/350V or 500V Black gate Cap's, I'm not 100% on +B either, I'd expect >> 300V.

Okay, feel free to comment.


PS, do not claim that this is EXACTLY the AN M3/6/8 Circuit, it will be close in principle though....
Attached Images
File Type: gif 5687 2-stage.gif (7.6 KB, 1696 views)
  Reply With Quote
Old 28th April 2004, 06:18 PM   #2
MaciekP is offline MaciekP  Poland
diyAudio Member
MaciekP's Avatar
Join Date: Mar 2004
Location: Warsaw
You was close!
The AN M3-8 PSU has 6x5 recification with 20H-100uF-20H-100uF-15k-100uF PSU. For a M3 version ELNA Cerafine for the M8 version BLACK GATE WKZ PSU CAPS. The same for Cathode caps. Everywhere tantalum resistors. For M3 output trans is M4 all copper version, for M8 Radiometal C36 permaloy trans with all silver windings. Each channel has it's own PSU. M10 version uses SR48 transformers with 6463 tube /similar to 5687/.
Attached Images
File Type: gif m3-6line.gif (13.7 KB, 1553 views)
  Reply With Quote
Old 28th April 2004, 06:27 PM   #3
MaciekP is offline MaciekP  Poland
diyAudio Member
MaciekP's Avatar
Join Date: Mar 2004
Location: Warsaw
one more comment: AN DAC 5 uses the above circuit, but the DAC3, 4 balanced are using different tube and 5:1 output transformer

  Reply With Quote
Old 6th June 2007, 11:01 PM   #4
EsE is offline EsE  Norway
diyAudio Member
Join Date: Apr 2005
Location: A cold place..
Ok, time to wake up this thread from the deep.
I'm thinking about building an AN dac sometime in the future.
Do you guys have the specs for a good transformer that would fit?
And what MackiekP is writing, is that AN has a choke loaded psu? Just confirming here..

  Reply With Quote
Old 6th June 2007, 11:09 PM   #5
diyAudio Member
Algar_emi's Avatar
Join Date: Oct 2002
Location: Canada, Qc
Interesting. You have 215V at the double 47K resistors, but what is the HV value before all the CLC filtering, just after the rectifier tube?

What is the heater supply, AC or DC? What type of rectifiers are they using if it is DC?

  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
Good Phono preamp circuit? PeterMoreton Solid State 46 6th September 2016 07:45 AM
Audio Note M7 Line Preamp?? bee696 Tubes / Valves 89 11th September 2014 10:29 PM
FS: Audio Note TRANS-010; Audio Note 20H 50mA choke; Black Gate Wk "power tank" Joseph0 Swap Meet 1 24th May 2006 05:17 AM
Audio Note AN-J DIY loudandclear Multi-Way 1 17th December 2004 09:36 PM
Audio Note Kageki vs. EAR 859 vs. Audio Innovations: The First Vortex Tubes / Valves 1 2nd February 2004 12:31 AM

New To Site? Need Help?

All times are GMT. The time now is 05:22 AM.

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