Resistor Markings Questions?

[Justin Thomas]

Hi All,

Picked up a box of random small bits on the cheap today. Got a small collection of resistors similar to the one pictured. All have the same construction, same color, different values. They're a white ceramic core with what looks like a carbon-based resistive material around it. The resistance & tolerance are self-explanatory but I was wondering about:

1. Power handling?
2. All of them have that "1%2" followed by a sideways letter right after the 2. The letters are B, I, J, L, or M. I'm wondering what those final letters might mean?

I tried goofling & even used my Goofle Lenz but haven't had any luck. Any ideas? Standard CTS pot for scale. Thanks!

Jusrin

[Helmholtz]

Judging by the logo this is a Rosenthal (Germany) resistor maybe from the 60s.
Rosenthal made high quality resistors used e.g. by Rhode&Schwarz.

[Justin Thomas]

Cool, thank you. Safe to say they're 1W? I'll see if I can dig up any more info.

Jusrin

[The Dude]

Purely a guess, but I'm thinking the 1%2 means 1% tolerance and 2W. I can't think of anything else the "2" would mean.

[Justin Thomas]

Thanks Dude,

After finding some on eBay that were "1% 0.5" I think you're right. I'll probably just treat them as 1W just cuz I think they're ancient. Maybe not. They seem to sell for a lot, for resistors I mean.

Maybe I'll offload them.

Jusrin

[g1]

I would tend to agree with The Dude, but I see on this page some specifically marked 1/2W, 1W, or 2W and they all still also have that '2' code on them:
https://www.byan-roper.org/steve/ste...voltohmys.html