Philips Mullard EF37A EF36 NOS ideal for Leak TL 12.1 Valve Amplifier

Description

Philips Mullard EF37A EF36 NOS ideal for Leak TL 12.1 Valve Amplifier
Philips Mullard EF37A EF36 NOS ideal for Leak TL 12.1 Valve Amplifier
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Description
Philip's Mullard EF37A Audio Pentodes circa 1960's RARE
A rare pair of N.O.S. of Philip's Mullard Miniwatt EF37A  audio pentodes, circa late 1950's early 1960's. Made in Great Britain,  Philips/Mullard  Blackburn, plant with the same batch and date codes. The EF37A was the most refined evolvement of the famous EF36 pentode employed as the front end amplifier used in the very first series of the famous Leak TL 12.1 KT66 amplifier, later this was updated to the EF37 and then the EF37A. I have several Leak TL12.1's and I have found the choice of well-matched and performing EF37A's is paramount for excellent performance and in my opinion the 'best sounding' front end tube for the Leak and other tubes amps. Measured for emission, leakage and mutual conductance and both exceed the specification for a NEW EF37A. A new tube is specified at Ip=1.8mA, and gm = 3.0mA/V.  Tube 1) Ip= 4.5ma. gm= 2.0mA/V, Tube 2) Ip=4.1mA, gm=2.1mA/V.Please check out my other auctions for interesting early HiFi items.
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