I’ve just taken my new power transformer from Monolith Magnetics out it’s box .. and there are a bunch of wires protruding from the base , as expected..
However there isn’t any identification on the wires ..
3 x green 1 marked with black
2 x red
2 x black
1 x Blue
3 x pairs of marked white ..
Is there a standard colour code for power transformer wires ?
However there isn’t any identification on the wires ..
3 x green 1 marked with black
2 x red
2 x black
1 x Blue
3 x pairs of marked white ..
Is there a standard colour code for power transformer wires ?
According to the Monolith Magnetics site, all their power transformers are made according to customer specifications.
Why not get back in touch with them, or did you obtain this transformer via a third party?
Why not get back in touch with them, or did you obtain this transformer via a third party?
Yes I have already this afternoon , it probably won’t get a response till Monday , they were all brought directly from them last year by myself ..
Just wondering if there was a standard colour code ..
I’m guessing the white wires are the 2 x 6.3 volt and 1 x 20 v
The 3 x green are probably the 375 -0- 375 .. the black marked being the center tap
But that’s it .. .. and I’m not going to take a chance ..
Physics still apply ---the high voltage windings will be smaller diameter copper and of course the low voltage with heavier current flow will have a larger diameter .
After 60+ years of repairing tube/valve radios most without color coding you learn what to check .
Have a look at very old Philips radios all the same color wire for all the connections including circuit wiring and "tar " covered components so you couldn't check values .
After 60+ years of repairing tube/valve radios most without color coding you learn what to check .
Have a look at very old Philips radios all the same color wire for all the connections including circuit wiring and "tar " covered components so you couldn't check values .
Sort out what connects to what (windings).
Find the highest resistance winding.
If it is less than 100 Ohms, add a 100 Ohm series resistor.
Connect a 6VAC source to this winding (and resistor).
Measure the actual voltages at all the windings (even the one you are feeding).
This gives you *ratios*. It may be rough because large ratio gives low voltages where you get into meter rounding error. But even a 50% error will let you sort a 6VAC winding from a 50VAC winding.
Using the new guess of winding ratings, feed 6VAC into your presumed 120V (or 240V) winding. Carefully measure all windings, and multiply by 20 (or 40). Be aware that a "600V" winding will be 30V and will sting sweaty skin, make you jump fall-down hurt your head. (Jumped clips ae your best friend.)
This of course assume you know, or can good-guess, what the winding ratings are.
Find the highest resistance winding.
If it is less than 100 Ohms, add a 100 Ohm series resistor.
Connect a 6VAC source to this winding (and resistor).
Measure the actual voltages at all the windings (even the one you are feeding).
This gives you *ratios*. It may be rough because large ratio gives low voltages where you get into meter rounding error. But even a 50% error will let you sort a 6VAC winding from a 50VAC winding.
Using the new guess of winding ratings, feed 6VAC into your presumed 120V (or 240V) winding. Carefully measure all windings, and multiply by 20 (or 40). Be aware that a "600V" winding will be 30V and will sting sweaty skin, make you jump fall-down hurt your head. (Jumped clips ae your best friend.)
This of course assume you know, or can good-guess, what the winding ratings are.
Contact Monolith. They should provide a data sheet or some schematic that shows how the different colours connect. Search through the box first, though. And online. Typically the manufacturer will either deliver the diagram on a slip of paper in the box or in a data sheet on their website.
You paid good money for the transformers. The manufacturer should let you know how to connect it. That's a very reasonable expectation.
Tom
You paid good money for the transformers. The manufacturer should let you know how to connect it. That's a very reasonable expectation.
Tom