6C4

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The 6C4  (European: EC90) (P/N 154-029,154-0029-00) is a VHF triode vacuum tube with a 6.3 V, 150 mA heater and a miniature B7G 7-pin base.

The 6135 is a high-rel version with higher heater current.

Used in

Some instruments using part 6C4

Instrument Manufacturer Class Model Description Introduced
190 Tektronix Signal generator 190 Constant-Amplitude Signal Generator 1954
3B2 Tektronix Plug-in 3B2 Delaying timebase plug-in 1963
507 Tektronix Oscilloscope 507 Power Industry scope 1959
511 Tektronix Oscilloscope 511 10 MHz Tube scope
First Tektronix oscilloscope
1947
511A Tektronix Oscilloscope 511A 10 MHz Tube scope 1948
517 Tektronix Oscilloscope 517 50 MHz scope 1951
Chemtrix 205 Chemtrix Plug-in 205 Polarographic timebase (?)