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 29th July 2004, 04:37 PM   #1
diyAudio Member
 
Join Date: Jun 2004
Location: Avila
Default Zout adapted for 2 EL34 80W Va=560V

Hello!!!

It's my second post in this forum...

My problem is that the OT is damged of a Spanish guitar tube amp Sinmarc G-2160-C (80W with Va=560V).

There would want to know which is the output suitable (Zp-p) for 2EL34 in push-pull class AB with 80W of output power and a tension of plate of 560V. I want select a OT...

I have found this web but it does not come specified for 80W and Va=560V.

http://tdsl.duncanamps.com/show.php?des=EL34

Which is the ideal Zout?

Suggested 5000 ohms plate to plate...

Thank you very much...
  Reply With Quote
Old 29th July 2004, 05:36 PM   #2
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
It will depend on the output stage topology. If we assume pentode, then 5000 ohms is about right.
__________________
"The way to deal with superstition is not to be polite to it, but to tackle it with all arms, and so rout it, cripple it, and make it forever infamous and ridiculous."- H. L. Mencken
  Reply With Quote
Old 29th July 2004, 06:56 PM   #3
diyAudio Member
 
Join Date: Jun 2004
Location: Avila
Default Thank you

Thank you for your reply.

The output stage is the Marshall style, but I modified connected supressor grid on the bias voltage and other modification suggested in Tone-lounge.
This modifications are after the OT fried. (injuried)
Sorry for my poor English.

The resistor grid is 5K6 and the resistor bias is 220K.
The Rg2 is 100 Ohms, feed to a 560 ohm from center tap of OT.
The plate voltage is around 560-580V.
If you view the Marshall 2204 JCM800 schematic, it's my base.

I wish that you have an idea of the topology of output stage...

Thank you very much.
  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
Calculating Zout for Pentode amp with NFB? Jeb-D. Tubes / Valves 32 26th May 2012 01:48 PM
low zout vs output transfo jeapel Tubes / Valves 6 6th February 2009 05:10 PM
help needed: hi Zin, lo Zout, hi swing driver for experiments aletheian Solid State 5 21st July 2008 03:28 PM
El34 PP Vs. El34 PSE alexmoose Tubes / Valves 47 6th September 2006 05:44 PM
Time for low Zout preamp argo Tubes / Valves 40 11th December 2002 11:58 AM


New To Site? Need Help?

All times are GMT. The time now is 03:49 AM.


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