2 US-Made 1625 / VT-136 Vacuum Tubes Milspec NOS-Testing Lot Of Two Muir Mathieson

2 US-Made 1625 / VT-136 Vacuum Tubes Milspec NOS-Testing Lot Of Two Muir MathiesonThis new old stock testing pair of 1625 VT 136 output triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 64 for Tube One and 69 for Tube Two where minimum (65%) is 40 and 100% is 62. These tubes have excellent flashing; Micanol bases; a dimpled sheet getter and double D getters, respectively and two additional support rods per tube for increased rigidity and

Tube One measured 1770 micromhos

new in box (For Tube Two) matched pair of GE 6FQ7 / 6CG7 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

Plate current measured 25

gray and silver coatings and an engraved / stamped base

Tube Four (triode): 41

This RCA 0A4G regulator tube tested to spec on our Paul Hart-calibrated TV7/U

They were Groove Tube-matched both with number 6 ratings

This lot of three Arcturus 6L7 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

They tested (from left to right) as follows: 35 and 52 where minimum (65%) is 40 and 100% is 62

This new old stock-testing Svetlana 6550C / 6P27 perforated plate output tube was tested on our Maxi-Matcher 2 with 400 volts on the plates and a bias of -48 volts for shorts

new in box RCA 6LY8 tested to spec on our Paul Hart-calibrated TV7/U

These four US-made 6H6G tubes were tested on our Paul Hart-calibrated TV7/U for shorts