[Boatanchors] SPEAKER SWITCHING

[W4AWM at aol.com]

In a message dated 8/6/2006 21:07:14 PM Eastern Daylight Time, 
carolew at bellatlantic.net writes:

> I would like to run a Hammarlund SP-200 and an SP-400 off the same speaker.
> What kind of switch or switching arrangement do I need to do this?

Hi,

There are several ways to do this but the safest way for the receivers, 
assuming they both have the same output impedance as does the speaker you plan to 
use, is to use a 4PDT switch which will switch a resistor of the proper value 
and a power rating of at least 3 watts, 5 to be safe, across the output of the 
unused receiver. If you forget to turn it off or turn the volume to zero when 
you switch speakers, you run the chance of blowing the output transformer 
which could cause additional damage to the unloaded receiver.  You can find push 
button switches with plenty of contacts for this type or arrangement, or Check 
Niles Audio to see if their switch boxes have built in loads. 

73,

John,  W4AWM