Hello. Your needs may be satisfied by a single-ended amplifier. One of 
the most common valve is EL84 (3-4 Watts of power), also it is a good 
sounding one. Why not to look simple schemes with this valve? Valve 
amplifiers are quite picky about speakers. Mostly they like full-range 
speakers (one driver).

Alex R. wrote:
> Hello. Your needs may be satisfied by a single-ended amplifier.
> One of
> the most common valve is EL84 (3-4 Watts of power), also it is a good
> sounding one. Why not to look simple schemes with this valve? Valve
> amplifiers are quite picky about speakers. Mostly they like full-range
> speakers (one driver).

Hello Alex! Thanks for your post. By "scheme" you mean find an amp that 
uses this valve? By full-range speakers you mean a speaker that has a 
wide frequency response? Apologies for the simple questions but I'm a 
bit of a noob.

Thanks in advance.

You're welcome.
1. Yes, you can find many amplifiers that use this valve. To get the 
most from valves, all the parts of an amplifier must be rather high 
quality.
2. Yes, that's right.

All my research so far brings up DIY kits and honestly I just want to 
buy an amp.
1. Are there any manufacturers that sell pre-built valve amps based on 
the EL84 at reasonable prices?
2. How would I go about matching an amp to speakers?

Some volume potentiometers in these KITs tend to fail after a while. 
Also you need to select a good output transformer. I'm not sure that 
modern stuff is good, while not being expensive. Maybe you should find 
old audio-transformers from a good tube radios - correct me, if i'm 
wrong.

Thank you all for the great advice but as I noted earlier, I am not 
looking for a kit. I want to buy a ready-made amplifier. One that has 
warranty etc.