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Old 24th November 2008, 11:20 AM   #11
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Join Date: Nov 2002
Any ideas as to how much amperage the green 6.3 winding might be capable of? Any way to check this? The leads are thick gauge solid wire.

The secondary output is 830 with no load.

Actually upon rechecking this and finding that I didn't get the same reading I changed the batteries in my meter and came up with 870 AC no load and 597VDC on the output of a 5U4 and a 16mfd/600 volt cap. Wouldn't this push the capabilities of this transformer up a little more?
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Old 24th November 2008, 02:05 PM   #12
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Location: Macedon NY
If the heater leads are solid, they're probably extensions of the winding. Some typical capacities at 500 circular mils/amp:

18 ga: 3.2A
16 ga: 5.2A
14 ga: 8.2A
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Old 25th November 2008, 12:01 AM   #13
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Thanks for the reply.

It measures about .063 for thickness. Would that be 14ga?
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Old 25th November 2008, 12:14 AM   #14
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0.063 would be closest to 14 gauge.

My reference suggests 700 circular mils per amp. That would say that 14 gauge is good for 5.9 amps. Clearly there is some latitude, as Tom's sources are more generous. I think the way to know for sure is to load up the winding, and verify the voltage drop under load is "acceptable".
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Old 25th November 2008, 12:48 AM   #15
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If I load to with 4 EL34's and the voltage doesn't drop am I ok?
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Old 29th March 2009, 12:08 PM   #16
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Update if anyone is interested

I used the transformer in my "Spare Parts Dynaco" amplifier that I built. It seems to work fine and will run for hours and still run cooler than the stock transformer does. The only glitch was it didn't have a bias tap and this problem was solved in another thread.
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