International Servicemaster 6CG8 6CG8A Vacuum Tube Valve NOS NIB

International Servicemaster 6CG8 6CG8A Vacuum Tube Valve NOS NIBThis new old stock, new in box International Servicemaster 6CG8A tube tested to spec on our Paul Hart calibrated TV7 U. 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 INSURED UP TO $100. ETSY PURCHASE PROTECTION

Transconductance measured 2000/1900 micromhos for Tube One and 2000/2000 micromhos for Tube Two

This lot of three RCA-Victor gray glass 50L6GT tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Transconductance was 1240 for Tube One and 1380 for Tube Two where new/nominal is within one standard deviation of 1900

rounded rectangle

Bottom: smooth

Tube One measured 63 while Tube Two measured 67 where minimum (65%) is 43

An excellent performance and live recording as well

(New 6SN7s typically test within a standard deviation of 2600 micromhos

new in box RCA Number 37 tube tested to spec on our Paul Hart-calibrated TV7/U

emissions and transconductance

This tube has steel support rods

new in box 11FY7 tubes tested to spec on our Paul Hart-calibrated TV7/U