schematics? (also some questions) - 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 30th December 2007, 02:35 AM   #1
m6tt is offline m6tt  United States
diyAudio Member
 
Join Date: Aug 2007
Default schematics? (also some questions)

Does anyone happen to have schematics for a Hammond organ model 2000 or 3000 (also called an "Everett", or "Everett by Hammond"). Captain foldback does not come to the rescue, nor does google. The amp itself is a Hammond AO-48 (? i think, rusty ). EF86, 2x12ax7 12dw7, 2xEL84. It looks like a freakish gibson vox hybrid. The organ was a combination of transistor tone generator and power tube and reverb amp. I just discovered that it had an oscillator in it too today, but it seems as though the oscillator may have simply provided voltage to offboard transistors to create a vibrato. The organ itself expired quite a while ago, and so now it's mounted in an old crate combo (it's not done but looks great so far)...I would really like to know what the deal is with the oscillator section, as well as see as schematic. The oscillator is working, I can hear it if i momentarily connect it to the signal path. I tried doing a bias-tremolo but it didn't work (more reading to do). It's cathode biased, but there was a powersupply for the transistors which provided -12v. Would it make sense to just connect the -12v supply (adjustable) in place of the 130 ohm cathode resistor? Would it make sense to connect the 5-10v oscillator output to the cathode of a preamp tube (no CCSs in the amp...normal cathode biased tubes) to get a tremolo that way?
  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
Schematics for TDA1541 Non-os DAC and many questions ZuMbAiU Digital Source 15 19th June 2010 02:18 PM
2 questions regarding DIY op-amp schematics wwenze Chip Amps 4 3rd May 2009 03:45 PM
H&K Tubeman Circuit Questions (added schematics!) El-Ahrairah Tubes / Valves 14 24th January 2009 10:38 PM
some questions about briangt schematics cb951303 Chip Amps 11 15th September 2008 03:02 PM
BOSE Schematics DENSO Schematics packer Car Audio 6 25th June 2007 10:55 AM


New To Site? Need Help?

All times are GMT. The time now is 07:22 PM.


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