Resistor identification? - Page 1
Forum section: electronics / beginners

author: Crambone
author_rank: Frequent Contributor
timestamp: June 04, 2021, 10:49:09 pm
content: I need some help identifying what I believe is a resistor. It failed open.It’s out of a Hallicrafters SX-17

author: BrokenYugo
author_rank: Super Contributor
timestamp: June 05, 2021, 02:42:36 am
content: Might be the old "body end dot" code, so 1.8 megaohm, or might not be a resistor. May be best to reference a schematic.

author: bob91343
author_rank: Super Contributor
timestamp: June 05, 2021, 06:13:40 pm
content: No. That is a ceramic capacitor. The reason it is open, of course.

author: Crambone
author_rank: Frequent Contributor
timestamp: June 05, 2021, 07:25:23 pm
content: Ok update, it wasn’t open I wasn’t getting a good contact. Cleaned leads and put on my cheap meter that identifies the part and said it’s a resistor and reads 122 ohms. Read again on my fluke and shows 121.6 ohms. Now the mystery is the color as it should be a 1.8 megaohm?In the pic I circled the tube the resistor is on Pin 5 G3.Looking at the schematic I’m not 100% sure what 6K7 Tube it is as they show 4.

author: Crambone
author_rank: Frequent Contributor
timestamp: June 05, 2021, 07:26:23 pm
content: Schematic

author: Crambone
author_rank: Frequent Contributor
timestamp: June 05, 2021, 07:27:00 pm
content: Part list

author: bob91343
author_rank: Super Contributor
timestamp: June 05, 2021, 08:08:26 pm
content: Since there are no resistors higher in value than 1 megohm, that's probably what it is.

author: RayRay
author_rank: Frequent Contributor
timestamp: June 06, 2021, 01:19:34 am
content: Going by the color coding of gray-green-brown, it should be 850 ohms. Resistors are color coded for a reason.See this calc:https://www.codrey.com/tools/resistor-color-code-calculator/Edit: Might be a 950 actually (if it's white instead of gray on the first). From the pic provided, it looks gray to me, but then again, it could be the lighting. The parts list does have a 950 in there though.

author: BrokenYugo
author_rank: Super Contributor
timestamp: June 06, 2021, 02:08:26 am
content: Quote from: RayRay on June 06, 2021, 01:19:34 amIDK about that, there's no brown band that I can see, just the case, and a 850/950 20% sounds like an odd value.I suppose the best way to figure this out is to get pictures of the chassis underside for context.

author: RayRay
author_rank: Frequent Contributor
timestamp: June 06, 2021, 02:13:16 am
content: Quote from: BrokenYugo on June 06, 2021, 02:08:26 amWell, I've never heard of two band resistors (only 3 and up) so I'd say that brown one does count!

author: lapi
author_rank: Contributor
timestamp: June 06, 2021, 06:20:38 am
content: Quote from: RayRay on June 06, 2021, 02:13:16 amhttps://all-unique.com/PDF/Antique_Resistor_Color_Code.pdf

author: tooki
author_rank: Super Contributor
timestamp: June 09, 2021, 05:20:05 pm
content: Quote from: lapi on June 06, 2021, 06:20:38 amGreat info, but crikey, that’s gotta be the most long-winded, circuitous description of a simple concept I’ve ever seen. Nowhere does it have a simple diagram to show “body: first digit. end cap: second digit. dot: multiplier”, which, together with the color table, is all one needs to know…