Speaker Switch That Protects Tube Amplifier


A EE friend of mine and I are planning to build a switch box that will allow me to toggle between my Yaqin MC-30L tube amp and my Integra 50.1 receiver to power my speakers.

The current plan is a very basic setup that would require the tube amplifier to be shut down before switching so that it isn't left without a load.

The utopian goal would be to be able to switch between the two amplifiers with a single source feeding both (i.e. the Yaqin has an Apple Express for a source and the Integra has an Apple TV so both could be running from iTunes on my Mac) without risk of damage to the tube amplifier.

I'm assuming that this would be complicated at best and probably isn't worth it, but thought I should as before we purchase parts.
mceljo

Got it.  Thanks.  Has the switch worked out as you hoped since these posts were made in 2015?

It's been in my system almost constantly since it was built and has worked flawlessly.  It gets flipped on average more than once a day.  I like that I can use the TV while letting the stereo amplifier stay on and effectively hooked to inaudible speakers.

If memory serves, it toggles between my speakers and the dummy speakers that are part of the switch with a resister in the circuit to provide a load during the switch.