I have some very similar (but not identical) tube modules in my IBM 519 Reproducing punch Mine are the same form factor, but the resistors are lengthwise. I'll attach the image which Kyle will get, but I doubt they will make it on to the list Bob Roswell broswell at syssrc.com 410-771-5544 ext 4336 Computer Museum Highlights -----Original Message----- From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Kyle Owen via cctalk Sent: Sunday, March 25, 2018 3:34 PM To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> Subject: Identifying vacuum tube module Anyone knows what these go to? https://imgur.com/a/CpxLs Thanks, Kyle