10 Philco Number / Type 41 #41 Vacuum Tubes Engraved / Hot-Stamped Bases Lot Of Ten

10 Philco Number / Type 41 #41 Vacuum Tubes Engraved / Hot-Stamped Bases Lot Of TenThese ten Philco engraved hot stamped base type number 41 tubes tested as follows on our Paul Hart calibrated TV7 U: 52, 54, 54, 54 54, 54, 55, 58, 58 and 62 where minimum (65%) is 40 and 100% is 62. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT YOU NEED OR HAVE ANY QUESTIONS. 1. MOST FORMS OF SHIPPING

44 and 48 where minimum (65%) is 30

This new old stock-testing matched pair of Philips Miniwatt PCF80 / 9U8 tubes was tested on our Paul Hart-calibrated TV7 for shorts

(New US-made 7408s typically test with plate current from the mid-teens to mid-30s with transconductance from 2300 micromhos or so

copper support rods and excellent flashing

Transconductance measured 44 and 48 where minimum (65%) is 35 and 100% is 54

new in box Sylvania 6S4A tubes tested to spec on our Paul Hart-calibrated TV7/U

This matched pair of General Electric 12AU7A / ECC82 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

It is in a Standard Brand box as this company bought odd lots of tubes from the major companies and boxed them up

All four tubes' diodes tested fine as well

Gain (Mu (µ): 14

copper support rods and great flashing

I am playing them in my Mini 2013 as I write and they sound excellent