Mismatching OT secondary on a 6V6 Express

[Curbdog]

I would like to use a 16 ohm cab with an Express with 2 - 6V6s, built with TW style OT, using the 5.2K tap of the OT primary. What is the optimum selection on the impedance selector switch for the OT secondary, 4, 8, or 16 ohms? Thanks for your help

[CaseyJones]

I would like to use a 16 ohm cab with an Express with 2 - 6V6s, built with TW style OT, using the 5.2K tap of the OT primary. What is the optimum selection on the impedance selector switch for the OT secondary, 4, 8, or 16 ohms? Thanks for your help

Optimum "by the book" would be to connect your 16 ohm load to the 8 ohm tap, that doubles the primary to arrive at a very safe 10.4k load plate to plate.

OR just connect the 16 ohm load to the 16 ohm tap, the reflected load is a little on the low side for 6V6s but so is every Matchless ever built.

Just don't get the crazy idea that tubes like very low load impedances, that path doesn't go anywhere you want to be.

[Curbdog]

Thanks CaseyJones ! Now, what about when I run EL-34s in the Express, and use the 6.6K tap on the OT? Any advantage to setting the impedance selector of the amp at 8 ohms, and using a 4 ohm cab, so the tubes see 3.3K? I understand that 3.5K should be safe for a 2 - EL-34 amp.