Does anyone have any vacuum tubes for passenger cars? I am in need of at least one tube so that the genamotor will pick up and begin charging batteries when moving. Style is 120 NO 1138 Its a thermal delay relay, I believe, eight prong, vac tube manufactured by TCI which is now Amperite. To be used at the Illinois Railway Museum. Thank You Roger Kramer

That's not a vacu um tu be, that's a mechanical relay sealed in glass. Different thing, I know, it may seem like "who cares, tomayto tomahto", but it'll confuse the people who can answer your question. You might want to change the subject line.

You're looking for stuff like this.
http://www.surplussales.com/Relays/RETimeD-5.html

could you double check the part #? according to your number, it's a 120 volt heater, normally open (delay to close), with a 1138 second time delay! almost 19 minutes?!? in addition to being very long and oddly specific number, i doubt a thermal delay relay could ever be made to time that long. They would of switched to mechanical timer of some kind.

It will be quite easy to substitute a modern relay, in fact it could be plug-and-play, no modification to your equipment needed. I'd be glad to help you get that done, if it's needed.

Correct part # is 120 no 11s8 or something like that.

Roger explains it as a 120V Normally Open 11 second delay 8 prong relay; used to limit amperage during starting.

Does anyone have a spare of this or a suggestion for an alternative that would work? Please contact Roger, or myself.

The link above
http://www.surplussales.com/Relays/RETimeD-5.html

They list a 115NO10 relay, for $45. This should substitute fine. It's 5 volts less and 2 seconds longer. check the pin out once you get it to be sure, but i suspect they are all the same.

I have an old thermal relay, and judging by the pin out, you can't likely substitute a modern octal socket time delay relay directly. But It would be no problem to either re-pin out a new relay, or make an adapter, so no modifications to your equipment are needed. Just let me know....

I looked at one Bob K brought in a few years back, was that from you? There are some on the surplus market.
http://www.electronicsurplus.com/edison ... 60-seconds

Correct term is a 120 volt, time delay relay, 8 pin octal socket.

But you need to specify delay on or delay off . Newer solid state things can replace the old ones some with adjustable delay knobs on top. Part is probably something like this...
http://www.grainger.com/category/time-d ... alog/N-8er

I'd also check the device or the schematic to make sure of the correct pin out, amperage etc.

Buzz

one possible obsticle to solid state newer relays, is the 120 control voltage on the car AC or DC....

I still think the above relay i found on that side would be great

Thanks for the link, looking deeper, the 115no10 8 pin octal relay should be what we need, 5 volts less, and one second less delay. From what I understand about the purpose of this relay, having not looked at the print, one second shouldn't make a difference.

115 is within the voltage "allowance" of 110-120V. I think this is on the A.C. side of the car's wiring, but again, I haven't looked at the print yet. Roger asked me to look into this since I have some electrical experience with locomotives.

Unless they are the older type with a heating element warping the contact I don't think the voltage will change the time much within the 110 to 130 range. Most of that old control equipment was designed to tolerate a 20 percent fluctuation anyway.
AC or DC will however effect the wear of the contacts. DC generally rated at only half the amperage of AC given the same contact size.