Make your own triode valve
The following movie file is large and slow
but well worth the wait !
for Movie - please be patient ..................
The movie reminds me ......
of the time I spent running the Isherwood's 'Tube Factory' in
Barnsley. Officially this
was a new company 'Alwyn Isherwood
(Electronics) Ltd' -
We reconditioned television cathode ray tubes, (monochrome of
course in 1959 /1962).
All the techniques we used were VERY similar to the techniques shown
in the movie.
Though we sometimes fitted new heater-cathode assemblies to old
electron guns, it was more economic to replace the whole 'gun' - at
around 7/6d (37p).
We sold the reconditioned 'tubes' to our parent company for £4 10s
(£4.50) - all sizes.
A relatively small number of tubes were sold to other TV repair
At that time, new crt's were about £1 / inch + Purchase Tax;
i.e. around £17 + P.T. for a 17" tube ! so ......
Our parent company made large savings and the Electronics'
company made good profits.
n.b. The 'Electronics' company closed in
1962 - major reductions in tube prices AND valves were offered by 'Mullard'
and 'Mazda' on the condition that we closed the reconditioning
I had had some three years experience so was quite
happy to move back to TV service work then, in 1963, to move to
(Leeds) as a senior
In 1966 I became a lecturer and, later, a senior lecturer & course
An Electronics Department Letterhead
Copy of Alwyn Isherwood (Electronics) Ltd Business Headed
This was the CRT Reconditioning Plant at Barnsley (1959 - 1962)
Operated by Mel Ashton & David Inman - Managing Director
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Updated Thursday 4th
December, 2019 Click
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