SET for 88 dB 4 ohm loadspeaker

Hi Pawlowski

My speakers respond well down to the 30’s (I believe the specs are –3db at 34Hz ) and the amp does provide a very deep and controlled bass. I have measured response down to the low 20’s, although that must be down 10-20db at those low frequencies.

The most critical thing for a tube amp is a speaker with benign impedance curve. Given that, you’ll be surprised how little in power is needed to provide high(ish?) volume levels.

I think 88db is a bit low for a 300B based set, but I am sure an 6C33, 805 or 845 based set will do well. I have a 22wpc 6C33 SET and it will blast my walls down if I turn it too high.

Regards
Paul

Thanx Paul. I stand corrected.

Another consideration is a set of SET amps based on a 13E1 tube. I think it's a tetrode running in triode and still produces 30+ watts

>Won't work. You need push/pull tube. Either KT90 or 6550<

No, that is bad information. An SET amp such as the NAT Se2Se will drive that load without breaking a sweat. These amps are push pull SET, Class A, and output 70WPC into a 4 or 8 ohm load.

I have no affiliation with NAT.

Audiofeil, I don't think you can have a push-pull SET. Do you mean push pull with a triode tube (e.g. 300b)?