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RE: Tri-amping T IV-A's with tubes?

I actively tri-amped my IIIAs (and their replacement ... my 'Frankenpans' - which used T-IVA mid panels and ribbons) for 25 years without using a series cap on the ribbons. I didn't blow a ribbon, ever - although it should be noted I was using ss amps which had a lot more power than you are thinking of! (120w into 4 ohms - and built to be able to drive 2 ohms!)

I think driving even 3 ohm ribbons with a tube amp would be non-optimal; perhaps you should use 'autoformers'?


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