NOS NIB EF37A Mullard
Made In England
Date Code: 284E1
Red Coated Glass
New in Original Box
Tested on Avo 160 Advance Digital Tube Tester
Sr.No.2730007 la:3.7ma mA/V:2.3
About Tube:
A rare early production Mullard EF37A, preserved in its original old-type box with factory wrapping paper. The box was opened only for photography, the tube itself has never been used or tested.
Manufactured at the renowned Philips Eindhoven plant, with clearly visible etched factory codes confirming its authenticity.
Mullard designated the EF37A as a high-gain, high-impedance pentode designed for audio-frequency preamplifier stages. The electrode system features anti-microphonic construction, and the specially designed bifilar-wound heater reduces hum to negligible levels – a hallmark of Mullard’s precision engineering.
When configured in triode mode, the EF37A reveals an exceptionally refined and natural sound, combining remarkable transparency, lush harmonic richness, and a beautifully fluid midrange.
These early EF37A tubes are highly regarded for their low noise, smooth tonal balance, and musical expressiveness, making them an excellent choice for high-end preamplifiers, phono stages, and classic audio restorations.
About Us
We specialized in thoroughly tested
and screened quality vacuum tubes.
We have various type of valves and tubes testers
– Amplitrex AT1000 Advance Digital Tube Tester,
– Hickok 752a tube tester,
– AVO Type 160
We have been in the valve and tube Business Since 1970’s.
Previously we were better Known as a Wholesaler,
but recently, We are offering more retail items.
All item are tested and guaranteed, supplied
We have Approximately 3,00,000 Valve and Tubes Stock
Custom duties and taxes is the responsibility of the buyer in their country
If the address is away from city, town there is extended area surcharge, So
Kindly confirm your orders before making checkout.
PLEASE CONTACT US IF YOU REQUIRE FURTHER INFORMATION ABOUT THIS VALVE.
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