Roksan Kandy KC1 MK3 faulty toroid

[dtses]

anyone has Kandy's circuit diagram or knows/ could measure the secondaries please?

The toroid is faulty and there is no way to see any specs on it. Roksan would charge 65 quid + postage for a replacement one and of course is not willing to reveal the specifications!

It looks like a 50VA toroid with 15-0-15 (probably) for opamp, X-0-X, and two other windings...

 

[amc184]

I don't think £65 sounds like such a bad deal. If no one else knows what the spec is and it's completely dead, you could cut it open and count the turns of each winding.

 

[dtses]

well, yes it's not that big deal, though doesn't actually worth as mint Kandy could be found for less then £200...

bad thing is that I cannot find any Roksan's schematics at all.
What did you mean with count of the turns, could you please elaborate a bit?

 

[amc184]

The voltage of each winding is proportional to its number of turns. Since you know the primary winding voltage you can work out the voltage of the others by counting the turns of each. It's quite time consuming though, I wouldn't bother unless you have a plan to replace it, I think a custom transformer will cost more than £65.

 

[dtses]

so I did it it took 2h to count all the secondaries:

for opamp:
- 106 + 96 turns (d 0.65mm)

the rest:
- 46 turns (d 0.23mm)
- 81 turns (d 0.71mm)
- 142 + 134 (d 0.23mm)

Now the question is how to understand what should be the voltages and current? Suppose for opamp it would be 14v, then will it be proportional for the rest? The iron core is 40x25x15mm.

 

[dtses]

According to the table here, max I could get from d 0.6mm wire is 0.8A, is it so?
Another post here on the forum is opposite, it is said it would be about 1.4A.
So which one is correct?!

 

[dtses]

for the benefit of other members here is the list of actual voltages and current needed:

2 x 14 vac 600mA
6 vac 200mA
11 vac 900mA
2 x 18 vac 200mA