The 8254  (European: EC1000) is a subminiature triode vacuum tube designed for preamplifiers in measurement probes or microphones (used e.g. in early versions of the Neumann M149).

Philips EC1000 = Mullard 8254

The EC1000 is used as the front-end cathode-follower in the P6025 and P6032.

Key Specifications

Heater 6.3 V, 185 mA
Anode voltage 110 V max.
Anode power 1.5 W max.
Transconductance 14.5 mA/V @ 15 mA
Cathode current 22 mA max.
Aged/Checked/Matched Pair Details
Used in Tek Part# S/N Range
? 157-0100-00 N/A


Used in

Some instruments using part EC1000

Instrument Manufacturer Class Model Description Introduced
P6025 Tektronix Probe P6025 400 MHz cathode follower probe (?)
P6032 Tektronix Probe P6032 850 MHz cathode-follower probe 1962