Quote:
Originally Posted by Mullard_Nut_74
Seems a lot of the companies that are still around have no historic data on their own equipment.
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Yup, and expect it to get worse.
Competition is a lot fiercer now than it ever was. Having space, whether physical or server space for archives costs money. Having an employee as a librarian or archivist even as a part time activity costs money. Breaking someone off their normal activities to search for an answer for one individual with a transformer produced long ago isn't going to sell any more transformers to him. There is no visible profit from helping.
Of course, there are some nice companies who treasure their past and want to maintain their reputation as good guys, but the ones who don't, get business advantages. In a dog-eat-dog world, they are going to beat the good guys in the race to the bottom.
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What valves was the 6.3v winding powering? This should confirm the voltage and also give an estimate of the current rating - very useful if you intend using the transformer.
You can also measure its inductance, and from this determine a magnetising current (treating it as if it were a primary) from this compared to the current rating, you can get an idea whether it really is any use on 50Hz.
Powering it up on 6.3v 50Hz from a very beefy transformer will allow you to measure the voltages of the other windings and identify tappings.
As said, the primary is likely to be the lowest DC resistance one(s) where you find others of a similar voltage.
BUT if it has dual primary windings, to do the series/parallel trick for 120/230v input, then you also need to find the relative phases of these windings. Connect them in series. Is the voltage across the ends of the pair now the sum of the individuals? or a lot less?
So by now you should know the primary windings and their tappings and the correct phase for combining them with a voltage selector. You should know the current rating of the 6.3V heater winding.
What was used as a rectifier? This will give an upper bound on HT winding current rating.
David