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Old 1st Nov 2021, 4:48 am   #57
joebog1
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Join Date: Jun 2015
Location: Mareeba, North Queensland, Australia
Posts: 2,704
Default Re: Golden Ear Laboratory Amplifier Build

Hi Tim,
Its wound for 8 ohms only. Four sections interleaved with five primaries. Leakage is very small and primary inductance is over 100 Henries. The primaries are sectioned from inner to outer, then back to inner where the screen taps lie, and thence to the centre tap. All plaigiarised from Hafler and Keroes design. My transformer impedance meter is also home made, essentially that found in the red brick, so I havent mentioned "figures".
I used the last of my onion paper in this build.
( Its my last "amp for me". )
Iron is 5% SiGO made in Newcastle before they shut down the plant of John Sankey.
Each traffo is around 7 kilos in weight, so I figure for a maximum of 50 watts its "big enough". My maths for 50 watts is 1 Tesla, although I use 64500 lines/inch.
( Chapter 5 of the red brick )

I have several "lots" of screened cable, from ordinary to audiophool hot pink. I will be measuring the capacity of each and of course will use the lowest capacity I have.

I have paused in the build while I mull all this over, and pick others brains, because I know very well I aint the brightest spark on the wheel.

Thanks to David as well.

Joe
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