Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki 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

Rewiring that EL509
Rewiring that EL509
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 12th November 2003, 06:36 AM   #1
cadman is offline cadman
diyAudio Member
cadman's Avatar
Join Date: Dec 2002
Location: Iowa
Default Rewiring that EL509

Hey guys, it's been a while! Remember that thread about reworking the 150w Rozenblit amps for EL34s to replace my cracking and troublesome EL509s?thread

Well, Runeight was kind enough to redraw the screen regulator ckt and finally I found the time to rewire what was my new homebrew. The bias pot had opened on the one channel so I went forward with firing up the other, and you know what, it sounds great!

I'm pushing the limits with these tubes, at least 750v on the plates (around 800v tonight with only one channel), 460v screen and bias near -41v or so. I switched over to the 4 ohm taps as recommended and there was no degradation in audio.

I did the 30db mod to the integrated grounded-grid preamp and now my gain is right where I want it, finally it's putting up a challenge to my last 6L6P-P homebrew.

Questions, concerns, dire warnings always appreciated

Now if I could just get the LCD display functioning.

  Reply With Quote
Old 12th November 2003, 05:49 PM   #2
runeight is offline runeight  United States
diyAudio Member
Join Date: Sep 2003
Location: Texas
Great to hear that it worked out. I think the EL34s take alot of abuse. Plate and screen voltages are high, but I think that many el34s have been run that way for years.
  Reply With Quote


Rewiring that EL509Hide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
El509 Pse Hojvaelde Tubes / Valves 3 14th January 2011 12:32 PM
Who will mod my rega p2??(rewiring) ncdrawl Analogue Source 0 16th November 2008 01:47 PM
EL509 as a CF GK Tubes / Valves 1 9th May 2008 09:25 AM
el509/519 horn150 Swap Meet 2 20th September 2007 08:48 PM
arm rewiring Havoc Analogue Source 6 12th July 2002 07:58 PM

New To Site? Need Help?

All times are GMT. The time now is 09:50 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio