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Thunderbird Club

Can you explain why as if I’m an …fill in the blank.
a Chemical Engineer? Sure, look at the 16, 8 and 4 Ohm taps on the secondary of the OT. If you plug into the top (EXT) the pressure contact switch will engage the 4 Ohm tap (disengaging the 8 Ohm one) at which point you’ll have the option of a 1 x 4 Ohm cab into the EXT or 2 x 8 Ohm cabs into both, the SPEAKER and the EXT SPEAKER jacks…..make sense?…
 
My theory is that by ‘71, ‘72, ‘73 companies figured out how to record live shows economically, and with good results. They learned from Woodstock and Altamont. That Rolling Sones truck thing just outside and all that. Or similar. CSNY. Uriah Heep Live. Yessongs. Bowie. Wishbone Ash. And so many others. I have some live albums from the sixties, but the only one I think is ok is an Association album. So I think we have Woodstock and the Stones for really starting the live album era. By ‘76, everyone was releasing live albums. Frampton being the king.
As good of an explanation as I've ever heard. Makes sense to me.

From my favorite live album. Best version of Crossroads I've ever heard. The definition of tearing it up. (Cream was the best band Ronnie said he, Allen and Gary ever saw.)
 
a Chemical Engineer? Sure, look at the 16, 8 and 4 Ohm taps on the secondary of the OT. If you plug into the top (EXT) the pressure contact switch will engage the 4 Ohm tap (disengaging the 8 Ohm one) at which point you’ll have the option of a 1 x 4 Ohm cab into the EXT or 2 x 8 Ohm cabs into both, the SPEAKER and the EXT SPEAKER jacks…..make sense?…
Yes, but I’m not an EE so those squiggly lines are hieroglyphics. ;)
 
Here's a photo I haven't seen of Lemmy playing a Thunderbird in Hawkwind.

big_hawkwind_dbrocklemmy.jpg
 
I wouldn't worry, just run your 4 Ohm into the EXT Sprk with NOTHING plugged into the main spkr....
View attachment 5064772
Chuck, you're the man - Instant answer and solution!

On my Marshall 2031, I didn't trust the integrity of the impedance selector, so I just hardwired one jack for 4 ohms and the other for 8 ohms.