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5B/258M

Sensibly equivalent to:
CV2347
See also:
Beam Tetrodes and the 807 - STC 5B/254M, 5B/255M, 5B/257/M & 5B/258M Advert - STC 5B/254M, 5B/255M, 5B/257/M & 5B/258M Advert
    
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The 5B/258M miniature beam tetrode was designed to have the same ratings as the classic 807 but with a 300 mA heater for series connection.
The adverts show the family of 807 replacements based on this design.
The anode from the side showing the additional radiating fins fitted to the front face.
The wide glass tube envelope is 29 mm in diameter and, excluding the B8B base pins, is 86 mm tall.
References: Data-sheet & 1040. Type 5B/258M was first introduced in 1957. See also 1957 adverts.

 

Pin Connections
B8B
1
2
3
4
5
6
7
8
tc
h
k,bp
g2
k,bp
g1
g1
k,bp
h
a

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
Pdriv
Pdiss
Pout
freq
19
0.3
600
250
-45
100
8
0.3W
25W
40W
60MHz
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 20, 2025.
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