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G6Tanuki · 22nd Jul 2021, 7:41 pm

It looks like some sort of public-address amplifier; I'd imagine the 3V battery and associated transformer/switch were intended to be used with a carbon-mic.

22nd Jul 2021, 7:41 pm	#2
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,007	Re: PEN3520 Amplifier project It looks like some sort of public-address amplifier; I'd imagine the 3V battery and associated transformer/switch were intended to be used with a carbon-mic.