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Matched pair tube Bi / PTT100 / Siemens very rare NOS

 

Matched pair tube Bi  / PTT100 /  Siemens  very rare NOS 

Test resultats:

Tube № 31986 I= 8,92mA

Tube № 32015 I= 8,90mA

Difference between the two tubes  - 0,02mA

Tube are measured for anode current at the following parameters:

Uf=4,0V   If=1,05-1,1A   Ub=229V   Ua =220V     Ug= -3V

Used measuring instruments :

Multimeter -  UNI-T UT70D

Range - 80mA

Accuracy ± 0,2%

See the measurement scheme in the photos!

These tubes are new.  Never used. 

Price excl. tax: 160.00лв.
Price inc. tax: 192.00лв.
Quantity:

Tube 2S49D triode USSR

 

Tube  2S49D triode  USSR

The tubes are new NOS  never used!

Price excl. tax: 10.00лв.
Price inc. tax: 12.00лв.
Quantity:
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