measuring voltages and currents simple se - 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 10th August 2009, 02:32 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)
Paul
  Reply With Quote
Old 10th August 2009, 03:38 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

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
Standard tube filament voltages and currents ilimzn Tubes / Valves 5 4th January 2010 06:53 AM
D1 bias currents spzzzzkt Pass Labs 2 26th June 2008 02:45 AM
power amp output currents (to speakers)? AndrewT Parts 6 29th November 2006 07:39 PM
Eddy Currents jsa_ind Solid State 3 14th May 2006 10:05 AM
Question about ac currents outside of US fortuosity Power Supplies 6 14th November 2005 03:07 PM


New To Site? Need Help?

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