CK-5755 (420A) Western Electric NOS

From €8.55 *

*Prices incl. VAT plus shipping costs

In Stock

Part Number: S5755
New Old Stock tubes, not tested for RoHS compliance.
Only for repair and restoration of historical equipment.

This CK-5755 is a double-triode made by Western Electric (USA) for Raytheon. It has same specs... more

Close menu

Product information "CK-5755 (420A) Western Electric NOS"

This CK-5755 is a double-triode made by Western Electric (USA) for Raytheon. It has same specs as 12AX7A / ECC83 / 7025 but with different pinout for Pin 2+3 and 6-8 (see data sheet). For use as 12AX7 an adaptor or an adjusted socket wiring for pin 2+3 and 6-8 is required.

Western Electric marked this tube WE 420A for their own brand.

The CK-5755 "features special cathode springs which reduce microphonic response. This characteristic is controlled by a "microphonic stability" test for balance in which the tube is tapped at shock levels of 400 - 600G." read more in the data sheet.

Documents...

Available downloads:

Read, write and discuss reviews... more

Close menu

Customer evaluation for "CK-5755 (420A) Western Electric NOS"

From: Ronnie On: 10 Jul 2020

Excellent

I bought a matched pair for the Phonodude designed by Triode Dick. Good matching (less than 0.1 dB gain difference) and excellent sound quality. I bought another pair for my secondary system.

From: Carl On: 16 Jun 2016

A secret NOS treasure! This CK-5755 is made by Western Electric as 420A (which are selling for about $100 in U.S.) but branded for Raytheon as 5755. In fact they have internals identical to 12ax7. They just need a socket adaptor (or rewiring) to achieve real U.S. made NOS 12ax7 tone in Western Electric quality. Outstanding!

Write an evaluation

Please verify your testimonial by clicking on the link sent to your email after submitting your text.