Hello Peter,
Nice to hear from you.
The diameter difference is to 0.05 mm for a 9.5 mm diameter pin,
and when considering also the socket contact manufacturing
precision and tolerance, it may be not so important for that
spring action contact.
The contacts are big and fillament current for the QB tube at half
value level than for a 4-1000.
SK510 with Valvo and Philips QB5/1750's were used in some
old european made amplifiers. Some of these amplifiers were in use here
in the early '70s, and a pair of SK510 socket and QB Philips tube from
them I saw at one of my friends here.
73's,
All the Best,
Traian
DF3KV@aol.com wrote:
> The QB5/1750 has the same socket as 4-1000 / 3-1000Z
> = super giant
>
> the pins are a little bit bigger in diameter, so the Eimac-Sockets have to be
> modified a little
>
> Original Valvo sockets are still available in Germany
> at "Schuricht" for about 90?
>
> 73 de Peter, DF3KV ( homebrew 3x QB5/1750 )
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