measuring voltages and currents simple se - 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 10th August 2009, 01:32 AM   #1
diyAudio Member
Join Date: Aug 2008
Default measuring voltages and currents simple se

Wow thanks everyone for all your helps!
Simple se in triode only sounds so good, and plays loud enough even with el34's so I don't think I'll even do the U/L & Cathode feedback.
I would like to measure all the things i should measure.
Do I need to measure the B+ where do I put the test leads?
I fired it up and let it cook then turned it off. measured the resistance of the cathode resistor(s) (I have a switch to select 680/600/560/540/520.
The resistance value decreased rapidly after the amp was turned off. Meter was still on voltage, and was still measuring some small dc voltage 10 seconds after turn off.
Should I just assume the resistance of the cathode resistor?
Thanks for all your help,
pics to follow (at some point)
  Reply With Quote
Old 10th August 2009, 02:38 AM   #2
diyAudio Member
Tom Bavis's Avatar
Join Date: Jun 2002
Location: Macedon NY
Measure B+ at the transformer primary and ground. Clip the leads on while it's off. Attach some wires if there's nothing to clip to.

If there's any voltage present, the Ohms reading will be off - maybe WAY off...
  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
Standard tube filament voltages and currents ilimzn Tubes / Valves 5 4th January 2010 05:53 AM
D1 bias currents spzzzzkt Pass Labs 2 26th June 2008 01:45 AM
power amp output currents (to speakers)? AndrewT Parts 6 29th November 2006 06:39 PM
Eddy Currents jsa_ind Solid State 3 14th May 2006 09:05 AM
Question about ac currents outside of US fortuosity Power Supplies 6 14th November 2005 02:07 PM

New To Site? Need Help?

All times are GMT. The time now is 09:59 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2