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6C9

 
    
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The Mazda 6C9 on the B8A base is a triode heptode frequency changer. The American 6C9 is a double tetrode on a B9A base.
The oscillator triode was required to provide a peak to peak voltage of 9 Volts.
The internal construction is interesting although difficult to see. The triode cathode is to the right of the picture with the grid in the same plane, the anode is to the extreme right. The tape strap (top left) connects the triode grid to the mixer g3. The mixer anode is on the left with a large gap to the other grids. Grids 2, 3 and 4 are single sided and the heptode is almost of planar construction after the control grid. What is missing is a fifth grid, so this looks to actually be a triode hexode mixer
The thin glass tube envelope is 20 mm in diameter and, excluding the B8A base pins, is 53 mm tall.
References: Datasheet & 1040. Type 6C9 was first introduced in 1948.

 

Pin Connections
B8A
1
2
3
4
5
6
7
8
h
a
a(t)
g1(t),g3
g2,g4
g1
k
h

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.45
250
100
-2.5
3
6
3M
0.65

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
80
5
PDF scanned from an original document held by the museum
Updated November 28, 2013.
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