RCA Black Plate 12BZ7 Vacuum Tube NOS NIB For Your Univalve Or Bottlehead

RCA Black Plate 12BZ7 Vacuum Tube NOS NIB For Your Univalve Or BottleheadThis new old stock, new in box RCA 12BZ7 tube tested to spec on our TV7 U. It measured 26 28 where minimum (65%) is 18 18 and 100% is 28 28. It has black plates; an O getter; steel support rods and outstanding flashing. I have listened to it in my Bottlehead Crack headphone amplifier and it sounded great. It is listed only as a good substitute for the 12AX7 which is only a fair substitute for the 12AU7 the recommended preamp tube for this headphone

This matched pair of black plate Hytron 6V6GT output tubes was tested on our Maxi-Matcher 2 for shorts

5 milliamps

new in box Sylvania 6W6GT tubes tested to spec on our Paul Hart-calibrated TV7/U

anode radiators for cooler performance and longer life

but for those of us who were around in the latter third of the ‘70s

Minimum (65%) is 32/32 and 100% is 49/49

63-29 188-20 date/EIA codes

It measured 42/34 where minimum (65%) is 40/40 and 100% is 62/62

These three 6G6G tubes were tested on our Paul Hart-calibrated TV7 for shorts gas and transconductance

It measured 52/57 where minimum (65%) is 40/40 and 100% is 62/62

But it does come with a very-well-preserved lyric booklet

T-plate 12SN7GT dual triodes was tested on our Paul-Hart-calibrated TV7/U for shorts