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Smallest all tube amp ?

Hotone nano legacy Thunder bass. 5 watt tube(I believe)amp. I haven't heard one but it looks interesting.

Those are little plate starved hybrids like the orange micros.

Maybe something like the Khan pak amp
Pak Amp

Ashdown Ctm15

A lot of companies are making little lunch box guitar heads in the 5-20 watt range. Depends on what you need to get out of a tiny tube amp
 
Search for an Ashdown LB30. Unbelievable little amp. (Head) Most demo videos or horrible. The overdrive on it is thin and ugly. But it's a simple Fendet style passive tone stack with some switches that make it interesting. Its clean to "furry" tone is fantastic.

The XLR out is a tap off the output transformer. So the power tubes are included in that sound. Great for recording.

I run mine live on stages with an Epifani UL410 cab (1100W cab). It kills. Yes, you read that correctly. That little head throws down with that cab.

It's a neat little 30W tube head. Pair it with the tiny cab of your choice.
 
1) plate starved 2) hybrids
1) what's that? 2) like just a 12ax7 or something for show and a class d for power?

Ampeg has a pair of small and slightly less small tube heads- the PF20T and PF50T. Lots of people say nice things about them, among the nice things are that they sound a little bit like an earlier model by the brand which I happen to like a lot... the B15n
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1) what's that? 2) like just a 12ax7 or something for show and a class d for power?

Low voltage. Yes sort of, though not necessarily class D, but that’s how the micro terror and similar amps work. Solid state devices with a low voltage tube for color. I was actually confusing the hotone with those. The hotone aren’t even hybrids, they’re entirely solid state.
 
Pity. That it could run without a load made it interesting. Most small tube amps. . Guitar ones mostly.. need to have a speaker attached. . So running as a pre amp is just that much sillier. Unless one grabs a dummy load thingy. :wacky:
Plus of course. . The pre amp was built with bass guitar in mind... Most small wattage guitar tube amps don't REALLY eq for bass well. Ime anyway
 
I play through one in a practice sapce...it belongs to the drummer. It easily puts out that "old school" tube amp sound, expecially if you fuss a bit with the EQ switches. Fun amp if you're after coloration.

I think I read that the LB30 has a Fenderish tone stack. So start with the knobs at 2-10-2 and that's closer to flat. Bass and treble are boost and mids is cut. Once you get to flat, throw the switches both ways to see which way you prefer them. Then tweek to taste.