Matched Pair Amperex 6BL8 Vacuum Tubes 7199 Substitute JJ NOS-Testing

Matched Pair Amperex 6BL8 Vacuum Tubes 7199 Substitute JJ NOS-TestingThis matched pair of French Amperex 6BL8 pentode triode tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 38 39 for Tube One and 41 35 for Tube Two where minimum (65%) is 34 36 and 100% is 52 55. As I write, I am listening to them with adapters in my Dynaco Stereo 70. They make excellent 7199 substitutes and sounded great in my amp. They were played with

I playing Easy Star All-Stars' "Dub Side of The Moon" through my Radio Craftsmen RC-2 amplifiers and they sound outstanding

SOME COUNTRIES DO NOT HAVE INTERNAL TRACKING

Transconductance: 2200 micromhos Transconductance: 2270 micromhos

MOST OF THE TUBES WE SELL ARE OVER 50 YEARS OLD

The vinyl is heavy with a light to lightly-moderate amount of pops and ticks

new in box Amperex 6R3 / EY8 tubes tested to spec on our Paul Hart-calibrated TV7/U

This lot of three RCA 12SC7 tubes tested as follows on our Paul Hart-calibrated TV7/U:

This tube has steel support rods

They measured 30/34 and 38/37 where minimum (65%) is 25/25 and 100% is 38/38

The Superior-tested tube measured "low to medium-good

IF IT APPEARS THE ITEM HAS ACTUALLY BEEN STOLEN

new in box RCA number / type #38 tube tested to spec on our Paul Hart-calibrated TV7/U