resistor color code NEED HELP .
 

Late last year I picked up a old Superior cross bar generator , I replaced the caps in it and I got the VHF section to work .
But the ocsillator for the bars is still not working , after lots of time spent messing around with it .
I have traced it down a resistor in the oscillator that it dead .
otherwise every thing checks out .
Any suggestions on this color code ?
It is a odd circuit ,there is JAN type 7193 wired up as a rectifier , and 2 , 954 acorn tubes , one as a transmitter , and the other one used as a oscillator to produce the bars .
Superior must have got a load military tubes .:yes:
the one end is silver , next to the yellow

To start of with black would be odd , would'nt it ? considering black is 0 on the first figure .
If I would start with yellow , it would be 470 ohm .

whats with the exrta colors ?

By "dead" do you mean open? Because that looks like a ceramic capacitor.

-Ian

Hi,

Looks like 470 ohms, 20% from the pic.

Cheers!

Retro's right, that looks like a capacitor.

looks more like a cap to me.

47pf 10% ??

peaking coil? showing my ignorance

Here's another vote for capacitor.

Ya know, a schematic would be KEY here.Don't suppose you got a diagram for that old relic.Good Luck..:scratch2:Color code is inconsistent for a resistor.Its either a choke or a cap.Do you have a LCR meter.

A say peaking coil, or cap. Color code is the same as with resistors, but is applied differently.

Slightly off subject... There's a really bad saying that we probably all heard at one time, which helps you remember the color code... I can't remember the whole saying, but it starts "Bad Boys Rape (O_____) Young Girls.........". Does anyone remember the rest of the saying?

Charles

Charles:

I will PM the saying to you. I'm not sure if I can post it here.

Steve

Here's another version:

Bad Beer Rots Our Yellow Guts But Vodka Goes Well.

Bad Boys Ravage Our Young Girls But Violet Gives Willingly....:D Can't help it, ex-GI.

But Violet Gives Willingly........


(edit.. oops, doubled...)

Close - the code is:
Yellow Violet Red Black (silver dot)

Yellow = 4
Violet = 7
Red = 2 zeroes
Black = 20% tolerance
Silver dot = something to do with temperature rating

So, that's 4700pf, or .0047uf, +/- 20%.

A modern disc cap would be labelled 472.

And it's ceramic, so it's probably still good. Might as well try a sub while you've got it out though.

-Ian

I don't have a schematic for this thing :tears:
I was stupid and felt sorry for it sitting there on ebay , bid $9.99 for it .
thats where the trouble all started :D
There is only 1 other one that I have seen on the internet , I emailed the owner and he dosn't have a schematic either .
I should have got a Heathkit instead .
Who knows it might be a capacitor , I cannot get a reading off it at all with the VTVM , even at the RX1 meg setting . I have studied the circuit , and it seems alot like a hartley oscillator circuit , which would make it the part in question a resistor .
I tried a 470 ohm resistor in it late last night and had no better results
I have switched the tubes and still no better . I had a audio generator hooked up to the oscillator tube , when its connected to the grid the it doesn't produce bars too well , but when it's on the plate I was getting a nice bar pattern .
perhaps the next step is to try a cap :yes: