Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => AmpTools/Tech Tips => Topic started by: rdrgtr on February 26, 2012, 09:49:52 pm

Title: Good tube tester for testing 7868 tubes
Post by: rdrgtr on February 26, 2012, 09:49:52 pm

I have a tube tester that is not very good.  I need one that will test 7868, 6550, and ECC88(6DJ8) tubes.  Any ideas?  Will the EICO testers work for these tubes without guessing on switch postions?  It would be great to have one that tests more that just emissions.

Title: Re: Good tube tester for testing 7868 tubes
Post by: stratele52 on February 28, 2012, 06:21:12 am

Any tubes tester can't really test tubes unless your tube are dead, no heater or short and you see that on your amp. Not enough voltage in tubes tester and not the proper load to test tube in "real life ".
Also no microphonic test avalaible.

Title: Re: Good tube tester for testing 7868 tubes
Post by: stingray_65 on February 28, 2012, 12:01:45 pm

I seem to recall I tested a few old ruby tube 6550's on my Eico 666.

What sort of tube tester do you have?

All tube testers have their shortcomings, most don't come close to testing under guitar amp conditions.

Basically they are good for telling you if there is a short, or it's bad, or ok.

Refer to this link (I'm sure you already have) for a bit about tube tester accuracy.

http://www.el34world.com/Forum/index.php?topic=6595.0 (http://www.el34world.com/Forum/index.php?topic=6595.0)

Ray

Title: Re: Good tube tester for testing 7868 tubes
Post by: thermion on March 11, 2012, 07:52:43 am

i found a later model eico chart that showed 7868 testing with selector d, meter 25, socket 29. ditto comments above.