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KT61

Sensibly equivalent to:
6AG6 6P25 CV1438 CV2938 EL33 N147 OM9
See also:
Osram Advert, December 1947 - Osram KT2, KT76, KT33C, KT66, KT61, KT66, PX4 & PX25 Advert - Osram KT2, KT63, KT61, KT66, PX4, U50, KT76, KT33C, KT71, U76 & U31 Advert - Osram Valve Range Advert - Valves for Power Amplification Advert - Osram Audio Output Valves Advert
    
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The KT61 is an audio output valve and features the standard 6.3 Volt heater that was introduced from America in the mid 1930's. The KT61 forms part of a series of very successful valves from M-OV.
The plain reverse where the Osram or Marconi labels would be stuck.
The top mica: cooling fins are attached to the control grid supports and an S shaped band connects the beam forming plates to the cathode.
The classic envelope is 44 mm in diameter and, excluding the IO base pins, is 102 mm tall.
References: Datasheet, 1043 & 1040. Type KT61 was first introduced in 1939.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
a
g2
g1
-
h
k,bp

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
rl
Pout
D
6.3
0.95
250
250
-4.4
40.0
7.5
10.5
6,000
4.3
8%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated August 06, 2016.
shape:classic construction:pinch type:beam.tetrode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.g2 pin:5.g1 pin:6.- pin:7.h pin:8.k.bp
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