General Electric GE 12AT7 ECC81 6679 Vacuum Tube Premium

General Electric GE 12AT7 ECC81 6679 Vacuum Tube PremiumThis industrial grade GE 6679 12AT7 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 69 65 where minimum (65%) is 50 50 and 100% is 77 77. It has gray, wing plates; a top, O getter and excellent flashing. I am playing them in my Bottlehead Crack headphone amplifier as I write. The Bottlehead calls for a 12AU7 which is a pretty different tube. That said, it has no

Enhanced Cooling: yes

It measured a perfectly-balanced 44/44 where minimum (65%) is 40/40 and 100% is 62/62

These tubes have great bass and sparkling highs and Mann's voice is warm and clear as a bell

This paperback book is in very good condition

This is a new old stock

Tube One measured 63/65 and Tube Two measured 66/64 where minimum (65%) is 50/50

These tubes have black and silver bottles

It measured 68/62 where minimum (65%) is 59/59

milspec GE JG-6X4WA tested to spec on our Paul Hart-calibrated TV7/U

There were no shorts or gas and they measured as follows (from left to right

They have G 5R and G SR date codes

This new old stock-testing matched pair of National Union-MANUFATURED Type 37 triodes was tested on our Paul Hart-calibrated TV7 For shorts