[R-390] Tube longevity

[2002tii]

KC0LWN wrote:

> To prolong tube longevity which is better:
> 1) keep the set on with the volume and rf gain turned
> down
> @0 Install a B+ switch and keep the palte voltage off
> with the heaters on until the set is used?

Military BAs generally don't beat their tubes (unlike a lot of home hi-fi
equipment), so leaving them on is generally OK.  Some oxide-cathode tubes
don't like having no B+ for long periods -- this may argue against the
second option.

Best regards,

Charles