[Amps] Transformer i.d.

[Glen Zook]

Looking at the transformer a little more, and doing some resistance measurements, I believe that you are correct.

I looked closer at the wires that were cut off on terminals 6, 7, and 8.  Instead of being like 12 gauge for the line voltage they are actually high voltage insulated.  The outside insulation, the center insulation, and the end of the wire were all black (corrosion on the copper).  That is why I first thought the 3 pins were the primary.

Since bringing the transformer to the work bench is a little bit harder than jury rigging a filament transformer at the transformer, I'll have to do that if necessary.

Glen, K9STH

Website:  http://k9sth.com


--- On Tue, 4/5/11, Martin Sole <hs0zed at csloxinfo.com> wrote:

I have ECA transformers in my Henry amplifier, not sure if Alpha used them also. The plate transformer I have is an ECA1171 but the configuration sounds almost identical. Like you I had to figure out the primary connections which I did using an audio generator at 60Hz and a scope. Then I applied 6 volts from a heater transformer to confirm the findings. Was dead simple.
 
I think you have the terminals wrong way round though 6, 7, and 8 are likely the centre tapped HT secondary and 1 through 5 the adjustable primary. On the ECA1171 the terminals would seem to be 1= 10v, 2= 0v, 3= 210v, 4= 230v. There are only 4 terminals on the 1171 not 5 as you have on the 1028.
 
Never found any information on ECA so I guess they are long gone.