Strange theory....

[geoffbyrne]

If the original premise were true, headphones/earphones wouldn't work.

G.

[Mr. Foxen]

That said, chances of an audible 40hz are fairly slim in a lot of circumstances.

[PlungerModerno]

[quote name='Mr. Foxen' timestamp='1340743867' post='1709125']
The danger part of a tube amp is that unplugging it doesn't stop it biting you. Which is the best lesson on electrical safety.
[/quote]

Very true... Those Capacitors mean business. I'd still start by plugging it out though. and using well insulated tools. After training how to repair them for a few years with
somebody who knows how. A schematic and research of components wouldn't hurt either.

[quote name='geoffbyrne' timestamp='1340745684' post='1709158']
If the original premise were true, headphones/earphones wouldn't work.

G.
[/quote]

Indeed. You'd be limited to low mids at best.

[quote name='Mr. Foxen' timestamp='1340745839' post='1709166']
That said, chances of an audible 40hz are fairly slim in a lot of circumstances.
[/quote]

Yup. AFAIK it's hard to hear 40 Hz unless it's quite loud... we humans don't have a good time distinguishing the low - low end. Especially in a mix.