Simple 45/2A3 schematic error? - 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 9th April 2008, 06:23 PM   #1
diyAudio Member
Richard Ellis's Avatar
Join Date: Sep 2006
Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.
Default Simple 45/2A3 schematic error?

I was perusing thru the JE Labs schematic sourcing parts when I came across the 6SL7 filiment off the Hammond 272 DX.
Correct me if I'm wrong but isn't that set-up wrong? JE has the heater filiment grounded off one is that going to define ground?
Reading MJ on page 330...Morgan is adament that grounding one side of an AC filiment will induce hum....think about side of a waveform shunted directly to ground....just as JE Labs has it in their schemo!
Morgan has either a humdinger or precision matched resisitors or a center tap so define ground.......not merely grounding one side................Anyone caught this?
________________________________________Rick...... ......
Attached Images
File Type: jpg wiring.jpg (14.2 KB, 343 views)
  Reply With Quote
Old 14th April 2008, 03:24 AM   #2
diyAudio Member
Miles Prower's Avatar
Join Date: May 2005
Location: USA
Blog Entries: 7

It's strictly a case of yes, no, maybe. I did a design that has no noticeable hum at all with a floating AC heater supply (to avoid Vhk poofage problems). Usually, some sort of balanced AC is best, but each case may be different, and it's a case of try it and see what happens.
There are no foxes in atheistholes
  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
Simple SE Schematic jobsworth` Tubelab 11 6th October 2008 02:41 PM
Error in Aleph 3 schematic ? JEKYLL Pass Labs 3 13th November 2007 03:45 PM
Error in power amplifier schematic routhun Solid State 20 26th December 2006 10:17 AM
looking for 25-35W simple amp schematic Mr. Triatic Solid State 2 15th February 2003 09:06 PM

New To Site? Need Help?

All times are GMT. The time now is 08:46 PM.

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