▼ Menu

2C51

Sensibly equivalent to:
396A 5670 CV2831
See also:
CBS 2C51 Box
    
Extras ▼

 

The 2C51 was originally designed for RF applications up to UHF. It is described as a medium μ double triode for VHF/UHF but recently it has been re-purposed as an audio valve in much the same way as the ECC81.
The 2C51 design was succeeded by the 5670,
The two small towers with the screen between.
Here the anode can be seen as a small box with a side flange for fixing and extra heat radiating surface.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 37 mm tall.
Reference: Datasheet. Type 2C51 was first introduced in 1960.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
h
k(1)
g1(1)
a(1)
s
a(2)
g1(2)
k(2)
h

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
6.3
0.3
150
-7.0
8.2
6,400
5.5
35
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 09, 2016.
Return to Main Index