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My Dad’s 30-yr old plus HP25.
Thanks to everyone for your help and encouragement
New battery holder, new battery contact (the springs and contacts) and aluminum foil trick. (I didn't use the spring here).

I finally put it all together and the HP-25 LEDs lit up for the first time since the early 1980s.
I am so happy. Now I need to clean this baby up.

…..Art

(01-27-2018 09:41 PM)larthurl Wrote: [ -> ]My Dad’s 30-yr old plus HP25.
Thanks to everyone for your help and encouragement
New battery holder, new battery contact (the springs and contacts) and aluminum foil trick. (I didn't use the spring here).

I finally put it all together and the HP-25 LEDs lit up for the first time since the early 1980s.
I am so happy. Now I need to clean this baby up.

…..Art

Congratulations!! I think that's more like 40 years??
Anyway, have fun with it!

(01-27-2018 09:41 PM)larthurl Wrote: [ -> ]Now I need to clean this baby up.

You can try Ultrasonic cleaning.
http://www.hpmuseum.org/cgi-sys/cgiwrap/...read=32903
http://www.hpmuseum.org/cgi-sys/cgiwrap/...read=89761

(01-27-2018 09:41 PM)larthurl Wrote: [ -> ]I am so happy. Now I need to clean this baby up.
…..Art

congratulations Art..
I think your Dad is a good smoker like mine.....