I've accumulated several sleeves of 6CW4 Nuvistors for my British integrated amp and I'd like to test and match them. My brother owns a Hickok 600A tube tester, but its roll chart has no information on this tube. Nuvistor production started in 1959, while this particular 600A was made before that.
Can anyone provide 6CW4 roll chart info for the Hickok 600A tube tester? Also, does the stock 600A have a socket to test this tube? If not, which socket adapter is needed?
Thanks in advance for any help you can provide.

Can anyone provide 6CW4 roll chart info for the Hickok 600A tube tester? Also, does the stock 600A have a socket to test this tube? If not, which socket adapter is needed?
Thanks in advance for any help you can provide.