Grounded power supply cord on a transformerless amp ? - 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 7th June 2009, 08:24 PM   #1
diyAudio Member
 
Join Date: Jan 2009
Question Grounded power supply cord on a transformerless amp ?

Hi again? Is it possible to put a grounded power supply cord on a transformerless amp ( 50C5, 35W4, 12AU6 ) provided it has an isolation transformer ?
BTW: What is the correct name for such an amp? I have heard "transformerless", "Line voltage", "voltage dividing"...??
Attached Images
File Type: jpg 0b9b_7.jpg (6.7 KB, 150 views)
  Reply With Quote
Old 7th June 2009, 08:38 PM   #2
diyAudio Member
 
Miles Prower's Avatar
 
Join Date: May 2005
Location: USA
Blog Entries: 6
Default Re: Grounded power supply cord on a transformerless amp ?

Quote:
Originally posted by bereanbill
Hi again? Is it possible to put a grounded power supply cord on a transformerless amp ( 50C5, 35W4, 12AU6 ) provided it has an isolation transformer ?
It is, and an isolation xfmr is mandatory for such a circuit.

Quote:
BTW: What is the correct name for such an amp? I have heard "transformerless", "Line voltage", "voltage dividing"...??
Suicide box.
__________________
There are no foxes in atheistholes
www.dolphin-hsl.com
  Reply With Quote
Old 7th June 2009, 09:09 PM   #3
diyAudio Member
 
Join Date: Jan 2009
Default Re: Re: Grounded power supply cord on a transformerless amp ?

Quote:
Originally posted by Miles Prower


It is, and an isolation xfmr is mandatory for such a circuit.



Suicide box.

Yeah...especially for harmonica players ! Scares the willies out of me when I see them advertsed on Feebay as harp amps. Gives a whole new meaning to the term "Hot Lips". With the isolation tranny and a grounded cord, are they reasonably safe? Some...especially this little Lindell I have...can put out a cool low-fi grind that is a useful recording tone.
  Reply With Quote
Old 7th June 2009, 11:38 PM   #4
diyAudio Member
 
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
With a properly wired isolation trans,and a chassis earth-ground connection,it is safe.
  Reply With Quote
Old 8th June 2009, 12:04 AM   #5
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
Suitable isolation trafos are available at very reasonable cost. Check out Triad's N-68X and N-77U. Allied Electronics has 'em.
__________________
Eli D.
  Reply With Quote
Old 8th June 2009, 12:11 AM   #6
diyAudio Member
 
Join Date: Jan 2009
Thanks Miles, DJ, and Eli. This amp has an OEM IT...must have been made after UL required them? So do i wire it as the 2 conductor and just ground it to the chassis ?
  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
transformerless power supply possible? theChris Parts 12 7th February 2003 05:31 PM
How do you make a power supply umbilical cord?? raincheck Pass Labs 8 16th January 2003 02:14 AM


New To Site? Need Help?

All times are GMT. The time now is 08:47 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