And that agrees exactly with that page that Fabio referenced. When I saw the blue band, I was thinking that would be the logical multiplier but the references I was seeing on the web stated that was

Looking at the 465B manual shows it to be a 47 uF, 20 volt dipped tant. The yellow dot is the voltage and is the positive lead. The bottom blue band is a 10^6 multiplier.

Glen, I have a different perception of the dipped tantalum markings being always in uF. Apart from the odd color coded ones from Tek, from all others that are marked with numbers, I would say half of

Richard's not the one who needs the admonition. That would be me; however, I'm not finding that info in the 465B manual. I'll have to look at the 465 manual. Thanks, Barry - N4BUQ

Maybe a dipped tantalum is assumed to be in microfarads for the base? I have never seen a tantalum in the pF range. The smallest I think that I have seen is 0.1 uF. Glenn --

Hello Richard, As soon as I read about your doubt on the color coding of the dipped tantalum caps that Tek used, I recalled having seen the color coding scheme on some Tektronix service manual. At

This is even more puzzling. I looked up the color code for tantalum caps, I found several sites. Top is first significant digit, ring is second significant digit, dot is multiplier, all as you say.

I've seen some that are, but they can be leaky. I've seen both modes of failure. Probably the most accurate statement that can be made about them is "tantalums fail". The dipped ones from that era

Still curious regarding the color scheme. The top is yellow, the ring just below that is violet, and there's a yellow dot (more like a splotch but still...). The last color (bottom where the leads

Dipped tantalums failing in a complete short without exploding is very ordinary in that vintage of gear.

I thought tantalums were noted for spectacular failure events. If this is indeed my shorted component, it simply failed quietly which I didn't expect. I'll have to lift one side to see if that's the

I thought I recalled them being listed as electrolytics but wasn't sure. Thanks, Barry - N4BUQ

I'd go for a dipped tantalum. They're known to fail. Harvey

The parts lisitings call tantalum capacitors electrolytics. That is just a normal dipped looking tantalum capacitor. Most will suggest that you replace it with the highest voltage tantalum you can

Oh, and, I mention CR4405 as I suppose it's possible that's shorted instead of C4331. Thanks, Barry - N4BUQ

Checking a few things in/around the LVPS of my 465B and noticed that TP4339 checks shorted to ground. I presume that's most likely C4331 or CR4405. Looking at the board, C4331 appears to be a rather

It would help if you would mention the continent! It is probably irrelevant to you, but I had a faulty U660. One internal resistor between pins 1/12 or 6/7 went open circuit. I "replaced" it by

Greetings Forum Members: I would like to buy any 485 scopes that are surplus to your needs, operable or inoperable. I have no restrictions on condition other than they not be stripped of all useful

I think this was aimed mostly at me. Sorry for stirring up the pot. -- Richard Knoppow dickburk@... WB6KBL

Dennis said: "Sigh! I did say OFF LIST in my post for a reason. This is way off topic." That's OK, Dennis - it's a nice diversion from the usual "what kind of caps do I use to fix my scope?"