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HL210

Sensibly equivalent to:
AR4 CV1303 CV3500 PM1HF
See also:
HL210 Advert
    
Extras ▼

 

The Marconi HL210 was first introduced in 1928 and is a general purpose triode.
The etching on the face of the envelope is hard to read. It says Marconi Valve and has the BVA logo beneath. The base has an A to indicate the anode pin.
The pinch and the wing on the base also indicating the anode pin.
The etching on the dome is most distinct.
Looking under the gettering the horizontal box anode is revealed. The grid is just visible at the top on the picture.
With enhancement the grid is easier to see. The anode can be seen to have been closed with a folded seam.
The balloon envelope is 40 mm in diameter and, excluding the B4 base pins, is 73 mm tall.
References: Datasheet & 1043. Type HL210 was first introduced in 1929.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
ra
gm
2.0
0.1
150
28k
0.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 04, 2013.
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