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Sale Pending: Western Electric 420a >> 12AX7 or 12AT7 Tubes with Adaptors NOS NIB 2 Pairs


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Item Condition: NOS
Shipping Options: Pickup available and you can audition.,Shipping is available at agreed cost.
Suburb or Town: Little Bay
State: New South Wales
Payment Method: Paypal, EFT, Cash on Pickup
Reason for selling: NLR
Western Electric 420a >> 12AX7 or 12AT7 Tubes with Adaptors NOS NIB
 
Price is per pair. Two Pairs for sale.
 
For sale are these great sounding Western Electric 420a /JW 5755 NOS tubes which when coupled with an adaptor (included) function as a superior 12AX7 or a 12AT7.  

 

NB. The height of the tube plus adaptor, to its base, is about 66mm.  This is a little taller than the usual 12ax7.

 

They are much better in many ways than other 12AX7s I have tried, including: Mullard, Telefunken, Amperex and any Chinese tubes (Psvane etc).

The most obvious improvements came in bass drive and resolution. Greater timbral information and texture is evident throughout the mids and bass.  Glorious textural information not experienced with any of the tubes mentioned above.  Dynamics are scary.  Clarity is excellent. 

 

Designed for very low microphonics… 

The WE 420a "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."   Very fine wires (springs) just above the top mica.  Please see all pics.

 

The specs are a little different from a 12AX7 which has an amplification factor of 100, 12AT7 is 60, and the Western Electric 420a is 70.

I have tried the Raytheon 5755 and GE equivalents and as expected the Western Electric sounds better and is reliable (the Raytheon is not).  WE is the real deal!

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Edited by MGO
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