pas filament supply - 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 18th April 2011, 09:53 PM   #1
yero is offline yero  United States
diyAudio Member
 
Join Date: Mar 2010
Location: Medina, N.Y. near Rochester N.Y.
Default pas filament supply

I am building the high level section for the pas-3. I out boarded the power supply. I am using two independant transformers. one for the B+ as well as for the 12V filament supply which is not a voltage doubler. My Question is do you ground the return from the two supplies together, I an getting 120HZ hum. also does the power supply chassis get bonded to the chassis of the high level chassis. Thank You anyone.
  Reply With Quote
Old 19th April 2011, 10:52 AM   #2
singa is offline singa  Singapore
diyAudio Member
 
Join Date: Apr 2004
Location: near
Send a message via AIM to singa Send a message via MSN to singa Send a message via Yahoo to singa
Quote:
My Question is do you ground the return from the two supplies together, I an getting 120HZ hum. also does the power supply chassis get bonded to the chassis of the high level chassis. Thank You anyone.
Hi, that depends....since you are getting hum ,that means you have
got the b+ and fillament returns connected at some point.Let's put it
this way if there is hum then separate the high b+ return and complete
it's (signal) circuit by itself.Same for heater.If there is no hum now,
only then can you combine them in a star ground point to the signal chasis.
Preferably near the exit point for the power cables.Whether you can use a star ground is dependent if the signal circuit is properly connected in the first place although it's good practice for noise reduction. Good luck.
  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
pas filament supply yero Forum Problems 2 18th April 2011 10:05 PM
Need help choosing a filament supply phrarod Tubes / Valves 0 30th November 2009 04:00 AM
Yet another DHT filament supply astouffer Tubes / Valves 25 5th July 2009 11:08 PM
Parallel vs. series filament supply - or another filament idea engels Tubes / Valves 11 13th May 2007 01:06 PM
Rectifier that doesn't need own filament supply? CarlyBoy Tubes / Valves 15 10th October 2006 01:29 PM


New To Site? Need Help?

All times are GMT. The time now is 04:35 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