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

DC filament ground and high voltage ground
DC filament ground and high voltage ground
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 15th September 2005, 05:52 PM   #1
mikeyho is offline mikeyho  Taiwan
diyAudio Member
Join Date: Mar 2005
Location: Taipei
Default DC filament ground and high voltage ground

Currently working on a local Marantz 7 preamp kit with regulated DC filament power supply. In its PCB layout, the amp circuit ground has been mixed with the filament DC ground, in a way that the pre-out ground level is 30mV or so higher than the high voltage PS ground (due to the passing of filament current, judging from the topology.)

I'm aware of the common sense that one should take the amp output ground directly from the PS ground (instead of the PCB ground) to avoid possible "positive feedback" generated by the passing of output stage current through the PCB ground.

Is the above layout design simply a bad practice then, or is it a possible trick to make good sound for such a legend circuit? (To fire up the filament with DC voltage, is it necessary that we isolate the DC ground from the high voltage ground?)

Thank for any comments in advance.
  Reply With Quote


DC filament ground and high voltage groundHide 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
Should I directly connect my signal ground to chassis ground? Bricolo Solid State 4 18th March 2014 09:42 PM
Parallel LM3886, input ground, power ground, safety resistor and oscillations. markiemrboo Chip Amps 5 9th August 2007 03:50 PM
Chassis Ground = Circuit Ground --> Problems? rhildenbrand Pass Labs 5 23rd April 2004 01:08 AM
does connecting mains ground with circuit ground create a ground loop? jarthel Everything Else 0 25th June 2003 12:55 PM

New To Site? Need Help?

All times are GMT. The time now is 08:34 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio