OTL amps, my pick for the tube used.


This is my OTL tube pick for an OTL the 6C33C tube.
I don't believe much can compete with it for current, and that the big achilles heel of OTL's  

https://www.navisonaudio.com/uploads/images/thumb_medium/otl-150-1.jpg

https://www.navisonaudio.com/uploads/images/thumb_medium/otl-150-3.jpg

Just had to show this, in it's glowing glory.

Cheers George
128x128georgehifi
giving an output current of 3 amps into any load.
I know this is a good figure for an OTL, but I have to laugh when I look at the flagship models of my amps (100-amps continuous)

https://ibb.co/59M4ZZp

https://ibb.co/VHgjcXJ

We had a pair of these here https://img.ukaudiomart.com/uploads/large/1760474-jbl-array-1400-speakers.jpg driven by the big Fluterman OTL’s, and they were sucked dry on transients when we wanted some medium level out of them.

Cheers George

Obviously people named George need not apply. This will be an amp for more efficient loudspeakers and for people who have some kind of emotional attachment to Futterman. I trust Roger will be able to build one that won't blow up. 
George, you should build one with your 6C33C tube and see how it goes.
Atma-Sphere corners the Market in OTLs as far as this guy is concerned. I have no interest in any amp that can not do at least 200 watts.  
Mike
Those 6C33s in the OP are too closely spaced for reliable operation. The 6C33 is a very hot running tube on account of its prodigious filament.

We re-introduced the Novacron by popular demand, but its a simple fact that other tubes are a lot easier to live with. 
I know this is a good figure for an OTL, but I have to laugh when I look at the flagship models of my amps (100-amps continuous)
Just to be clear, that's 100 **watts** not amps, per the manufacturer's website. With 150 watts into 4 ohms, that's about 6.2 amps total. Our MA-2 can do more than that.
I have yet to talk with the owner of a product that uses 6C33 tubes that hasnt had to live with much higher than average problems with these tubes during the first 50 or so hours of use. Perhaps this is no longer the case.