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EY88

Sensibly equivalent to:
6AL3
    
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The EY88 is an efficiency diode for television line scan service. This is normally found as the PY88 with a 300 mA heater for chain use. The EY88 would be powered by an winding on the line output transformer.
The peak voltage can reach 6,000 Volts and the peak current can rise safely to 550 mA.
The use of the later logo shows that this exhibit dates to 1970 or later.
The stitched anode plates are wider than the envelope and so are folded at right angles at the ends.
The folded ends of the anode plates. Note than the inner surface is bright and the outer surface is carbonised. The aim being to radiate heat out of the envelope and not back to the cathode.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 79 mm tall.
Reference: Data-sheet. Type EY88 was first introduced in 1959. See also 1959 adverts.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
tc
ic
ic
ic
f
f
ic
ic
ic
a
k

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
6.3
1.55
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 04, 2022.
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