Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki 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

Newbie- Tube Testing RF Amp tube
Newbie- Tube Testing RF Amp tube
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 25th October 2011, 05:44 PM   #1
jsternmd is offline jsternmd
diyAudio Member
 
Join Date: Oct 2011
Default Newbie- Tube Testing RF Amp tube

I am replacing a pair of 6293 (similar to 6146A) for my ham HF tranceiver. On testing a batch of NOS 6293 on a Hickok 539C, I find the occasional high outlier. Most of them test around 8800-1000 Gm with plate currents around 55-65ma (tube data shows min Gm 4600). Every once in a while I find a tube with real high Gm values almost double ~ 17,000 with lower plate current ~50ma. Is this due to a bad tube oscillating? Any special technique to test such a tube?

tia
jerry
  Reply With Quote

Reply


Newbie- Tube Testing RF Amp tubeHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Some general tube questions from a Tube newbie !! Minion Tubes / Valves 11 6th March 2010 01:38 AM
Tube Amp Kit for newbie starro Tubes / Valves 32 17th July 2008 01:37 AM
Harmon Kardon tube amp kit testing diamondsouled Tubes / Valves 10 8th April 2008 02:07 AM
Your favorite tools for testing when building a tube amp rokali Parts 3 20th October 2007 11:50 PM
learning, building and testing tube amp fragman56 Tubes / Valves 103 11th March 2003 10:53 PM


New To Site? Need Help?

All times are GMT. The time now is 03:47 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki