[kchapdaily]

im starting to collect some 12au7 tubes for the soha II and CTH amps im working on, and ive been kind of skeptical about buying tubes from ebay. so i thought it might be helpful to have a tube tester. i want it to be able to match tubes, and ive read that in order to do this, the tester must be able to check the mutual transconductance. i found this design. have any of you guys have had any experience with it?

 

[HiGHFLYiN9]

I've heard good things about the Transcendent Sound Tube Analyzer, so you may want to add that to your short list. The kit runs $699. 

 

[kchapdaily]

will do thanks for the link! looks like a fantastic kit.
 
anyone have any experience building/using it?

 

[Uncle Erik]

You might want to look around the Transcendent Forum (same site) which should have some members who use it.

 

[kchapdaily]

good idea ill go check it out