<A HREF="http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3010942719&category=296" TARGET=_blank>http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3010942719&category=296</A> <P>Someone recently gave me this exact model, and I haven't used it because the AC power cord has been cut off. I assume it has something to do with the method used for testing. <P>------------------<BR>

Not a bad old emission tester for pre-war tubes. The data might be a little hard to come by if it's not with it. They might have just cut the cord because it was crumbling and didn't want any liability. Put a new cord on and moitor the current as you apply power(dim bulb tester). The price was right!<P>------------------<BR>

Hmmm, some of my last post got wiped. It was supposed to say "why are some tube testers so expensive, and some so cheap?" then "I assume it has something to do with the method of testing." Am I right in assuming that emmission testing is no good?<P>------------------<BR>

Hi Mark<P> Nothing wrong with emission testers. They just check amount of current drawn rather than gain.<P> Here is something I thought was interesting.. Set up a Hickok 539A for 01A tube. Test a 71A tube with the same setting. Both tubes will test about the same.<P> Now use an emission tester and do the same thing. The 71A will pin the meter hard. <P> The 71A will handle around 6 times the current as 01A. This can be seen on an emission tester but not mutual conductance tester set up for an 01A. <P>------------------<BR>Norm