Thanks for this info! Just what I needed. On Tuesday, August 5, 2025 at 7:37:28 PM UTC-4 Michail Wilson wrote:
> Hello, > > > > Pin 13 and 14 are not used. Most sockets (if not all) will have an open > area for the pins to slide in even if no connection is made. For that > tube, you could literally simply cut them down (carefully) so you don’t > have to worry about it like in the circuit design you included a picture of > (pcbway?). > > > > Very few tubes use those pins (like the B5971) so finding the sockets > loaded with all 14 holes is rare in itself. When I spot them on ebay, I > snag them (for no real reason other than just knowing they’re rare). I > love the auctions where people post pictures of tubes with sockets (14 pin > complete) and selling for the cost of a $5-$10 tube. Those sockets are > worth more than the tube itself. > > > > I believe the 5991 is pin compatible with the IN-12 (That is IN-12A. > The IN-12B uses pin 12 for the leading decimal point where the 5991 and > IN-12A don’t have it. > > > > (So, unless you’re using a B5971, you don’t need sockets with pin 13/14 > loaded with connecting gear) > > > > M1 > > > > *From:* [email protected] <[email protected]> *On Behalf > Of *Tom Lang > *Sent:* Sunday, August 3, 2025 9:45 AM > *To:* neonixie-l <[email protected]> > *Subject:* [neonixie-l] Re: Newcomer From Asheville, NC 5991 vs IN-12 > > > > Some insight as I was thinking about this. I looked at some pcb sockets. > Apparently pins 13 and 14 are not carried thru the actual socket itself. > This would imply that as long as the tubes were not directly soldered onto > the pcb board itself (I would expect no one to do this) a board for the > IN-12 could accommodate a 5991 after all?? > > On Sunday, August 3, 2025 at 12:35:37 PM UTC-4 Tom Lang wrote: > > I'm a retired electrical engineer familiar with designing and building > vacuum tube amplifiers. This is my first foray into the nixie tube clock > world. > > > > I want to use the Burroughs 5991 tube on some pcb boards designed for the > IN-12 tube. I have looked and looked but cannot find definitive answers as > to physical interchangeability of the two especially on prefabricated pcb > boards designed for the IN-12. At this time I do not have any of the tubes > or boards on hand. > > > > It appears (see attachments) that the 5991 has two extra pins 13 & 14 that > would have to be accommodated if one were to utilize a 5991 on a board for > the IN-12. However, the picture of the "tube adapters" implies otherwise > (where's the holes for 13 and 14?). Also it DOES appear that chassis mount > sockets (such as the brown ones shown) do have relief holes for the extra > 5991 pins. > > > > There are attractive prices for premade boards for the IN-12 tubes that I > probably would purchase if they are compatible with the 5991. However, I > don't mind having to use chassis mounted sockets and flying leads if > necessary for the 5991. > > > > Thanks for your help. > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion, visit > https://groups.google.com/d/msgid/neonixie-l/f5f96fac-3906-4457-996d-54749fd39815n%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/f5f96fac-3906-4457-996d-54749fd39815n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion, visit https://groups.google.com/d/msgid/neonixie-l/5dd93c0a-4aef-420f-a0a1-dcf02c79952dn%40googlegroups.com.
