Up for your consideration a highly sought-after early and ultra rare pair of 

Philips Miniwatt 

ECC83 

Holland made- mid 50s production.

Audio preamplifier tubes with 45° D foil- getter w/stem support + foil strip, copper grid supports and 17 mm long grey plates...

mC productions - please see pictures for details.

the good clean valves  but the the date code have rubbed off. ... Great tubes for fine audio applications; hi-end or guitar amps.

The valve has been screened using an TV7-D/U and shows good getter flash and strong/balanced value for each triode section:

44/44, 46/46 (min. 32)

Live audio test for hum, noise and microphonics

GREAT AND HARD TO FIND AUDIO TUBE!!