Party Zone
Bally, 1991I don't see any, all they have is the BT138-600E sensitive gate will that work I was looking at those on ebay?
I would use it. They really aren't that critical in this application.
Are yoyu sure the original is faulty? They are very robust and reliable. You can't test them the same way as transistors with a meter.
Yes I'm pretty sure none of the fuses are blown, I got the machine with the BG lower half blown and just temporarily jumper-ed the lead (green wire) to the top half lights (purple wire) on the connector, now the red pf lights just went out on me and again the fuses are good. I just wonder if I should turn off the dimming feature?
Tough to find a proper replacement for him. Need to keep an eye out for I-GT values (gate current). Originals were in the 10mA (typ) to 25mA (max) range. Some of the replacements tended to be in the 2x to 3x range or more - especially in the 4th quadrant. Important to keep the gate current low as the higher value parts don't work well. The BT139X parts are in the 22/70mA range which is a bit more than 2x original.
I asked Todd Tuckey and he seems to think the BT139-600E would be the best replacement all the values are the same other than the voltage being 100 volts higher capacity. I'm certainly no engineer but it seems to be the best option for replacing the BT139-500E triac.
Quoted from G-P-E:Unfortunately, that one may be just as hard to find as the BT139-500E.
Here in germany you can still get it:
Also the BT139-600E is no problem:
If you want, I can order there for you and ship to you 
Thank you guys very much I just ordered 10 off ebay last ones too! I'm eventually going Rottendog or something the tec is here now!
Quoted from german-pinball:Here in germany you can still get it:
http://www.reichelt.de/Triacs/BT-139-500/3/index.html?ACTION=3&GROUPID=5280&ARTICLE=5958&OFFSET=16&SID=95WCzIxawQATUAADY7Q-U85b7954767f64d96ad9b8645e4b0f25b&LANGUAGE=EN
Also the BT139-600E is no problem:
http://www.reichelt.de/Triacs/BT-139-600/3/index.html?ACTION=3&GROUPID=5280&ARTICLE=5959&OFFSET=16&SID=95WCzIxawQATUAADY7Q-U85b7954767f64d96ad9b8645e4b0f25b&LANGUAGE=EN
If you want, I can order there for you and ship to you
Problem is -- those are the high gate current versions. Getting the "D" or "E" suffix part is the hard part.
Wanna join the discussion? Please sign in to reply to this topic.
Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!
This page was printed from https://pinside.com/pinball/forum/topic/replacement-for-an-obsolete-triac-bt139-500e and we tried optimising it for printing. Some page elements may have been deliberately hidden.
Scan the QR code on the left to jump to the URL this document was printed from.
Omaha, NE