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Permalink Reply by Phil Thomas on January 8, 2014 at 5:16am

Here's the radio in all it's glory

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Permalink Reply by eric gittins on January 13, 2014 at 12:08am

hey phil, thanks for the thanks!

i'm glad the radio is working out as is - it's a real shame when these old valve amps get gutted just because someone can't spend the time to work it out.

your "EX.L.S", or external loud speaker, is just what you thought.  but with that schematic there's a switch to turn off the inbuilt speaker too.  yes, you can rig up another speaker, but remember that speaker load is reflected through the output transformer to the output valve, it it likes to have a load it was designed for.  that means if you connect an external speaker, make it a similar impedance speaker to the one in the radio, and use that switch (sw3) to turn off the inbuilt speaker when you use the other.  the switch may even be in the external jack?

the end of the world won't come about if you muck around with this, but best results will be had by sticking to what the output tube likes best.

cheers

e

Permalink Reply by Phil Thomas on January 13, 2014 at 12:53am

Thanks Eric
I'll give it a go.

Phil