Vacuum tube tester, do you own one? - 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 15th November 2007, 12:53 AM   #1
diyAudio Member
 
Join Date: Nov 2007
Default Vacuum tube tester, do you own one?

Do you own a vacuum tube tester?
If so, what make and model?

I just got my hands on an EICO 628. It is only an emission-type tester (I can't afford the dynamic transconductance ones!), but it is in a pristine condition, and with some small refurbishing it should be as good as new.
  Reply With Quote
Old 15th November 2007, 02:07 AM   #2
7N7 is offline 7N7  United Kingdom
diyAudio Member
 
7N7's Avatar
 
Join Date: Jan 2003
Location: England
I am interested in testers; sadly I no longer have one.

As an Englishman, of course I had an English tester, an AVO 163, which has a good reputation in England.

I do not know much about American valve testers; can we see a picture of your EICO?

7N7
__________________
Plug them in and light them up
  Reply With Quote
Old 15th November 2007, 02:30 AM   #3
riffer3 is offline riffer3  Canada
diyAudio Member
 
Join Date: Jul 2007
I've got one on my "To Buy" list
  Reply With Quote
Old 15th November 2007, 02:54 AM   #4
diyAudio Member
 
HollowState's Avatar
 
Join Date: Aug 2006
Location: Taxland, New Jersey
Your Eico tester may be the first tube tester I ever owned. Either that or a 625, Can't remember. But over the years I've owned many different types. Currently I have:

For receiving tubes:
Hickok USM-118B cardmatic (my favorite because it's fast)
Hickok 539C (my favorite manual type)
Hickok 1575B (similar to 539C w/cathode bias resistors)
Hickok 752A
B&K 700 (also easy and fast setup)
2 Tektronix 570 curvetracers (late round corner versions w/5K+ S/Ns)

For transmitting/industrial tubes:
A rack mounted system, with various plug-in sockets, for steady class-A tests up to 1500 watts input. (<5kv) Gm is measured with a 1Khz 1v reference signal. All elements are monitored.

A second rack mounted pulse system (<2500v) for 2500 watt tubes and up. Peak amps measured with sample & hold peak detector. (analoge meter) Maximum filament power is 200 amps or 1500 watts. (The limit of my AC mains.) This system also tests large rectifiers and thyratrons on a CRT display using isolated AC. (<10amps)

I could put up a pix or two if anyone is curious. (Yes, I've been doing this a long time)

Victor
__________________
"I regard the brain as a computer which will stop working when it's components fail. There is no heaven or afterlife for broken down computers. That is a fairy story for people afraid of the dark." ~Stephen Hawking
  Reply With Quote
Old 15th November 2007, 03:00 AM   #5
diyAudio Member
 
tubelab.com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
I have two tube testers around here somewhere. One is an Eico, and the other is a Hickok. Both are mutual conductance type. I use the Hickok occasionally. I have found that when testing a batch of random used tubes about 5% of tubes that tested good in the tester had problems when used in an amplifier. The usual problem is high distortion, low gain, or low output. When the tube tester says the tube is bad, it usually is.

If I have a bunch of the same tube to test, I will rig up a test fixture that biases up the tube to a reasonable current and runs a signal through the tube. The output goes to a scope and a distortion analyzer. The distortion readings vary a lot for some tube types, and are a lot closer for others. 6AU6's in triode are all over the place.
__________________
Too much power is almost enough! Turn it up till it explodes - then back up just a little.
  Reply With Quote
Old 15th November 2007, 04:58 AM   #6
diyAudio Member
 
bassrogue's Avatar
 
Join Date: Mar 2006
Location: Yelm, WA
Send a message via Yahoo to bassrogue
I have a Hickok model 800 tester that I use most of the time and a Heathkit model 21 for backup. The Hickok is a mutual conductance tester.
__________________
Just once I wish someone would call me "Sir" without adding, "you're making a scene"
  Reply With Quote
Old 15th November 2007, 06:19 AM   #7
diyAudio Member
 
Join Date: Mar 2007
Location: Canandaigua, NY USA
I have a small Eico, but I don't remember the number. Works well, but I always remember the advice given in the old Tektronix manuals- don't rely on the results from a tube tester. If the tube works in the circuit, it's good. To test, swap the tube in question with a known good tube.
  Reply With Quote
Old 15th November 2007, 06:32 AM   #8
Colt45 is offline Colt45  Serbia
diyAudio Member
 
Join Date: Feb 2002
Location: Canada
Send a message via ICQ to Colt45
hickok 800 or 800A.. i forget
  Reply With Quote
Old 15th November 2007, 12:42 PM   #9
diyAudio Member
 
Join Date: Nov 2007
Quote:
Originally posted by 7N7
I am interested in testers; sadly I no longer have one.

As an Englishman, of course I had an English tester, an AVO 163, which has a good reputation in England.

I do not know much about American valve testers; can we see a picture of your EICO?

7N7

Sure! Just give me a couple of days and I will do so.
  Reply With Quote
Old 15th November 2007, 01:04 PM   #10
diyAudio Member
 
Join Date: Nov 2007
HollowState:
you really have some awesome artillery!
I wish I could afford half of what you got.

But between sound reproduction and my other hobby (my wife calls it a mental disease),photography, I have my resources stretched thin.
  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
WTB: Vacuum Tube Tester mrdon Swap Meet 0 22nd May 2009 05:01 AM
S3E Vacuum Tube angsuman Tubes / Valves 12 15th March 2008 06:12 AM
The Vacuum Tube Truth Serratoga Tubes / Valves 31 29th November 2007 10:25 PM
Vacuum Tube Pre O.C.L. gianmaria Tubes / Valves 13 16th February 2006 07:32 PM
DIY Vacuum tube amp turbo_h4 Tubes / Valves 2 1st July 2004 02:48 AM


New To Site? Need Help?

All times are GMT. The time now is 05:11 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