✅ Up for Sale 2 Pcs
Type: VR56
Equivalent Designation: 10E/11402
Manufacturer: Rogers, Canada (Military Contract)
About the Tube
The VR56 is a pre-WW2 military receiving pentode valve. The VR prefix in the type designation stands for Valve Receiving.
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.
The V.R.56 is a rugged, military-grade pentode built for reliability and consistency in demanding RF and communication circuits. Known for its low noise and stable operation, it remains a trusted choice for vintage military and audio restorations.
https://www.radiomuseum.org/tubes/tube_vr56.html
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