2 National Union NU Number / Type 41 #41 Vacuum Tubes Clear Bottle Lot Of Two 1A7GT Grid Cap

2 National Union NU Number / Type 41 #41 Vacuum Tubes Clear Bottle Lot Of Two 1A7GT Grid CapThese two National Union clear bottle type number 41 tubes tested as follows on our Paul Hart calibrated TV7 U: 54 and 60 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 EXCEPT MEDIA MAIL ARE AUTOMATICALLY

9 milliamps

There were no shorts or gas and they tested as follows:

engraved bases and narrow rectangular mica spacers

I am listening as I write and this album sounds very good with only an occasional click and pop

I am playing them in my Sound Craftsmen RC-2 monoblocks (as an "excellent" 6SN7 substitute according to Antique Electronic Supply's "Tube Substitution Guidebook") with "Hanson Conducts Ives

Tube Three: 40/2120 and

There was no gas

Flashing Quality: good

new in box industrial-grade GE 6679 / 12AT7 dual triode was tested on my Hickok 600A for shorts

Date Codes: 1-43 and NK

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

These tubes have mica snubbers for increased stability and lowered microphonics