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23 May 2017 


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BL63 tube (Double Triode valve)

BL63 tube (Double Triode valve) Manufactured by Marconi/GEC

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General Information

The BL63 is an indirectly heated glass unmetallised double triode. Of low impedance with one grid taken to the top cap.

It was supplied to the UK RAF during the 1940'S for use in the R1155 receiver that was fitted to Lancaster and other aircraft. Its output fed the twin-needled Visual Indicator and one of these instruments was usually fitted on the top of the cockpit instrument panel.

Nowadays it is used in audio equipment as a non-direct replacement for ECC32’s although the in circuit current is slightly different and the pin out is different.

Testing the BL63 can be complicated due to disparity. Testing data given below.

CHARACTERISTICS

Heater voltage                                                  6.3                   V

Heater current                                                             1.27                 A

DIMENSIONS

Maximum seated height                                                116                  mm

Maximum diameter                                          45                    mm

Base                                                                 Octal

Net weight                                                       50                    g

PIN CONNECTIONS

1

2

3

4

5

6

7

8

T/C

No connection

Heater

Anode 2

Cathode 2

Grid 1

Anode 1

Heater

Cathode 1

Grid 2

RATINGS

Maximum Operating conditions

Vf

Af

Va

Vg

m/Aa

ra

gm

µ

6.3

1.27

250

-16

7

2860

4.2

12

Typical Operating conditions

Vf

Af

Va

Vg

m/Aa

ra

gm

µ

6.3

1.27

150

-12

7

2860

2.5

12

TESTING CONDITIONS

Vf

Af

Va

Vg

m/Aa

gm

6.3

1.27

200

-12

12

2.5

Before the test adequate time should be allowed for the test chassis to attain a constant temperature. Testing should be applied to each half of the valve.

Photo of 310A manufactured by Western Electric

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