Compact ~20WPC Tube Amp

Another vote for Quicksilver.

And another for the Quicksilver Horn Monos!

agree with jasonbourne52 seek out a ST-70 properly refurbished.  I bought a new custom build recently from retroaudio on US audiomart for peanuts just to have a tube amp to rotate and it's more enjoyable in my system than my previous RM-10.  He's restored hundreds of Dynacos for decades and knows his craft.  He does ST-35's as well.

http://glowinthedarkaudio.com/chris-keller-st70.html

@atmasphere

Based on your comments your speakers are nowhere near efficient enough to work with your SET.

Which leads me to suspect that the 96 db sensitivity rating is exaggerated or (More possibly) the speaker’s impedance curve and load just isn’t suitable for an SET 300b.

My speakers are 94 db but a 14 ohm impedance with an appropriately designed/damped woofer to not require much amplifier DF (Damping Factor). They literally sing with my 300b SET mono blocks and replaced the previous 100 watt amplifier.

So, much depends upon speaker design and intended use.Push pull tube amplifiers will usually have lower output impedance and thus higher DF. Also generally they utilize some degree of NFB which increases DF.

Most SET amplifiers are zero NFB (Or very low) and will require different/compatible speaker loads. OP’s speakers just need a good quality push pull amplifier and they’ll do well.

Charles

Which leads me to suspect that the 96 db sensitivity rating is exaggerated or (More possibly) the speaker’s impedance curve and load just isn’t suitable for an SET 300b.

@charles1dad That wouldn't surprise me at all. The impedance thing is why I wrote this article since so many speakers that are rated 8 Ohms actually have 4 Ohm woofer arrays and simply aren't meant to be driven by zero feedback tube amps! That was part of why I convinced Israel to try making speakers with higher impedances. It doesn't help that speaker manufacturers seem to often overstate their numbers as well.