Tapping AC source from Primary input Transformer

[Shu]

Dear master,

I own a tube amp with selectable AC input voltage transformer (110, 117, 230 and 240V). I have set it to 240V. Is it possible for me to tap the 117V on the transformer to be used for tube tuner that fixed at 117V AC input (trying to avoid stepdown transformer).

Thanks/electronic newbie

 

[echo47]

Probably yes. That's called an "autotransformer". I use that technique to run a 115 VAC cooling fan in 115/230 VAC switchable equipment. Just be sure you don't overload the transformer.

If the tuner chassis is connected to the AC neutral wire, be very careful that you don't create a shock hazard!