BAD 6.3VAC winding

[tardishead]

I just got 2 power transformers from Edcor and I am surprised to find that the heater windings on both measure 7.6VAC and not 6.3VAC.
How bad is this - do I need to look into this or is this acceptable??

 

[Kingston]

that 6,3VAC is specified for the load, which is what 2-4A?

your transformer is perfectly fine.

 

[tardishead]

I am measuring the windings in a working circuit - Federal Limiter - with 1.5A heaters.

 

[Kingston]

I see. but what is the 6,3VAC winding max spec, far more than 1.5A?

 

[tardishead]

Rated for 2 amps

 

[Kingston]

it certainly sounds like your transformer is not up to spec then.

On the other hand, you could now have DC heaters. That winding can (just about) handle it.

 

[Greg]

Also, what is your line voltage?

My house runs a little on the high side (119.5VAC), so my heater voltages run a bit high as well.

 

[tardishead]

Is it ok to pad down the voltage with a couple of resistors??

 

[Jonte Knif]

Is it ok to pad down the voltage with a couple of resistors??

Sure. A couple of 5 Watts.

Do you have all other secondaries connected and drawing the designed current as well?
That does affect the heater voltage too.

What is the total VA-rating of the trannie? If it is very small, the losses are substantial and secondary use makes a big difference. If it is big, no more than 10% "regulation" should be expected between unloaded and loaded run.

Contact the factory any way. I would not accept that kind of deviation, but on the other hand we are not dealing with mass production and can solve the issue with resistors.

-Jonte

 

[CJ]

you could rectify  and regulate it, or just use resistors

add a power lamp that drags 300 ma, and see if that helps.