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807

Sensibly equivalent to:
5B/250A ATS25A ATS25 CV124 CV1060 CV1364 CV1374 CV1572 QV05-25 RK39 VT-100 VT-100A VT60A VT60
See also:
Beam Tetrodes and the 807 - Brimar 807 Box - The Williamson Amplifier - Olympia Show 1947 - CV1060 short entry
    
Extras ▼

 

The classic 807 beam tetrode valve is unusual in still being designated as current production in the 1960s and having a five pin base. The 807 was normally run hard and different makes of 807 held up better than others. This exhibit looks to be new and unused. It was not made in the UK and has the pejorative term Foreign printed on the glass. Probably made in the 1960s.
The parameters given are for single ended use. When used in a class AB1 as a push pull pair with 600 volts on the anode an output power of 65 Watts was normal.
The anode is insulated with ceramic spacers.
The elliptical lower screen is indicative of the 807 design.
The five pin base with pristine pins. The pins are slit and bowed slightly to grip the valve-holder.
The upper screen and copper lead to the top cap. The anode is a box with extra flanges at the main heat producing face.
The classic envelope is 50 mm in diameter, and excluding the UX5 base pins is 119 mm tall.
References: Data-sheet & 1040. Type 807 was first introduced in 1938.

 

Pin Connections
UX5
1
2
3
4
5
tc
h
g2
g1
k
h
a

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
6.3
0.9
300
250
-14
83
8
20k
6.5
6.7W

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
mAg
Pdriv
Pdiss
Pout
freq
f.max
6.3
0.9
600
250
-45
100
7
3.5
0.2W
25W
40W
60
125
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 15, 2021.
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