[mrupgrade]

Time to thin the herd !. I have multiple's of these tubes and looking for some realistic values on them as I wish to sell
at fair and sane $ . Any info will help and reflect in the asking price .
The GE 6550A's seem to go from $40. to $200. per tube !
I know there are many variables that reflect the values , they have been acquired over the years for use in higher end
amplifiers.







   

[Phil A]

Here's one site - http://vintagetubeservices.com/mini-tubes-2/

[FullRangeMan]

Do you want identify these tubes? They have no Id?
-The middle tube seems EH KT90.

Prices vary by a myriades of factors as new, used, tested, non tested, low noise, year, brand, burned/gas, new production, NOS etc