It is an aluminium box containing 2 specially ordered Sowter transformers, 3104 with 2 secondaries so that it can be either 1:10 or 1:20.
It had been ordered to Brian Sowter before 2000 so that the Grampian 25Ω GR1/L ribbon mics can be connected to Ferrograph 634 or 632.
The transformers had been resecured and re soldered. Currently one at 1:10 and the other at 1:20.
The primary inductance is about 3.9H.
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