1/2 power layout

Brentsp · Post by **Brentsp** » Tue Nov 01, 2005 1:03 pm

I have the pentode/triode layout but would like to know how to do the actual 1/2 power by switching two of the tubes off/on.

Thanks in advance.

Billy Batz · Post by **Billy Batz** » Tue Nov 01, 2005 2:26 pm

You just lift the cathodes on the inner or outer pair.

Brentsp · Post by **Brentsp** » Tue Nov 01, 2005 2:33 pm

Billy Batz wrote:You just lift the cathodes on the inner or outer pair.

Thanks Dan, what pin is that?

And would it be just be two wires from the switch.....one for each tube?

Billy Batz · Post by **Billy Batz** » Tue Nov 01, 2005 2:56 pm

Pin8 and yes.

rockstah · Post by **rockstah** » Wed Nov 02, 2005 10:42 am

this sounds very kewl

Billy Batz · Post by **Billy Batz** » Wed Nov 02, 2005 11:38 am

Its not in any way a half power switch. At least as far as perceived volume is concerned. Your talkign like a 2-3db drop. And really all it gives you is a totally uneeded switch when you could just pull 2 tubes. But you can add it easily if you wanted it.

rjgtr · Post by **rjgtr** » Wed Nov 02, 2005 5:32 pm

I think the Pentode/Triode is generally more useful. To really lower the power, you'd need to lower the B+ to the power tubes like a lot of the old Musicman amps did.