15-05-2014, 08:21 PM
5X4 and 5Y4 have all 8 pins and are 1 1/4" ID. 6SN7 and 6SA7 (and their 12V equivalents) also have all 8 pins. Those are 1 5/32" ID which is exactly the right size to accept an Amphenol ring-mount socket (the ones that mount with a wavy spring on the bottom of the chassis). I have the ring-mount sockets in 4, 5 and 6 pins and would be glad to send those to you. I have two 5X4 bases, and of course lots of the other tubes but with my luck I'd run a batch though the tube tester and find them all good.
