VR56

The valve in civilian name is an EF36. This valve was obsolete by the 1960s, and our data sheets show that the EF36 had identical characteristics and pin connections to the EF37 and EF37A. These were all high gain low current intermediate frequency amplifiers in superhet receivers and all featured external metalisation. With their low capacitances they would be useful at radio frequencies as well as IF.

It is interesting that as the series progressed, and eventually only the EF37A was produced, the valve had acquired the characteristics of low noise and low michrophany and the EF37A became a standard audio pre-amplifier for professional use before the advent of the EF86.

The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 81 mm tall.

http://www.r-type.org/exhib/aaa0087.htm

Best Regards

Júlio Branco

Dear Julio

Can you please edit this and select English as language? It is now in "other language" - but your wording is in English.

I did already change texts for you - but then my name apears in your post ...

Just above the title in your WYSIWYG-Editor you see language selection.
There are probably many readers selecting only for English. Those would never see your work.

Mr. Erb,

Thank you for having called me to the attention. I had not repaired in this detail.

Thanks

Cordially

Júlio Branco

Already one is corrected.