"All hail Pete Traynor!"
I just built a 2x12 cab for my Valve Junior. It is 16 ohm. Works great with the Valve Jr. I would like to try it with my Traynor which has a 8 ohm plug for an extension cab. From what I understand (very limited understanding of course) I should be able to hook it up to the Traynor without a problem because the "ohm" is lower on the amp than the cab. Is that right?? Anyone, anyone?? I want to try it out but, I want to be sure I won't blow up my amp!
Nope! But don't worry, you won't blow anything up. Tube amps are pretty forgiving.
The "ohms" are supposed to match. That is, the amp should be set to the same ohms as the cabinet. It may have an impedance switch or it may have different output jacks for 4,8 or 16 ohms.
You're right that your cab is 16 ohms, which is higher than for what the Traynor extension jack is designed. What will happen is that if your Traynor is a combo with its own built in speaker the load will be shared between the speaker in the combo and your extension cab. When these loads are different the lower load will hog the power.
So you might not find that 2x12 to sound very loud! The combined load will be only a bit less than the 8 ohms of the internal speaker so the amp itself won't be stressed. As I had said, tube amps are very forgiving of speaker mismatches.
Go ahead and try it! If the volume isn't high enough see if there's a way to unplug the internal speaker and run only the extension cab.
You can wire up a dpdt switch in your cab to switch the speakers from series to parallel. That will let you run 4 ohms or 16 ohms. Running 4 ohms will mean the 2x12 will hog the power and that might be a solution.
Of course, your 2x12's must be 8 ohm each to get 16 ohms. So there's no way to get 8 ohms from that combination. BUT! BUILD ANOTHER ONE!:banana:
2 cabs of 16 ohms daisy chained will give you 8 ohms. With 4x12s and the internal speaker even small amps can break leases!:tongue: