6P7S/6BG6G/G-807) MATCHED PAIR TESTED WITH ROETEST V10 FOTON TUBES 1964!!!                              

EXCELLENT for Audio Applications!

NOS in Box!!!From 1964

The bind is for 2pcs
                                                         FOTON PLANT 

The tubes passed all quality tests (vacuum, leaks, shorts etc.), measured with Roetest,  the buyer will get all data, actual datasheet – test protocol, for each tube.

In photos you can see example of data for each tube.


Tested with Roetest V10, "the Rolls Royce of tube testers" [emissionlab quote], a wonderful german professional system for testing tubes, it shows everything about a tube.    

Those who use tubes are more familiar with terms like bias, gain (µ), plate current, slope/transconductance, and maybe someone is wondering what the term „D of plate” in the measured data means. Its value in itself is not so important but it is useful to calculate the other parameters taking into account Barkhausen's tubular formula S x D x Ri = 1 (slope * penetration * internal resistance=1), where D is –dUg/dUa at Ia=const. Barkhausen vas a german physicist, he was “the guru” of tubes, his theory and formulas guided the entire period of electronic tubes. 


The output tetrode 6P7S is designed for power amplification in the output stages of horizontal scanning of television receivers, in transmitting devices and power amplifiers of low frequencies.

Rated electrical data of 6P7S lamp
Voltage of glow, V 6,3
Anode voltage, V 250
Voltage on the second grid, V 250
The bias voltage on the first grid, V - 14
Current of heating, mA 0,9
Current in the anode circuit, mA 72
Current in the circuit of the second grid, mA no more than 8
Steepness of the characteristic, mA / V 5.9
Internal resistance, kΩ 32.5
Gain in triode switching 8.5
Output power, W not less than 5,5

Please allow for the following shipping times:
EU countries: 5-8 business days, on rare occasions a few days more
USA: 10-15 business days, on rare occasions more
South East Asia (Japan, Singapore, S. Korea, Hong Kong, Taiwan etc) 10 business days, on rare occasions more
India, China, Russia, Kazakhstan, Pakistan, Indonesia, Malaysia, Thailand, Australia, South Africa etc: at least 15 business days, but frequently around 25 business days
 
Please note that shipping cost is calculated at average. If you have any objections please contact me for a specific quotation.