Best 300b single-ended Tube amp. for the $

Having heard quite a few 300B based amps, IMHO the Wyetech Sapphire Monoblocks can compete with pretty much anything out there. They have three gain adjustments and are extremely quiet with horns. Build quality is pretty amazing as well. They are sold direct and run $6,800 in the U.S.

Thanks all
My budget for an amp is 2-3000.00,+ same for speakers - used.

Yes, I have a Jadis DA-60, and as nice as that may be I am bored with it and want to try something exotic..

My room is on the large size so am thinking about a sub - in the 2000.00 range

add speakers that are 'different' than what you have to mix it up a bit, or the sub. the jadis is a classic...it'll be sought after forever like mac, vintage marantz, etc...its that good.

Saffy,

Decide on high efficiency speakers first because they will be the biggest determining factor in a low-power system depending on space, musical preferences, and replay volume. A better understanding of your preferences/needs would really help us with suggestions.

If you are into Mahler at realistic volumes with the least amount of distortion and greatest dynamics, a 100+dB multi-way compression horn system would probably be best.

Intimate acoustic, jazz trio, quartet, vocals etc...that's where full range single-driver systems excel.

In between, multi-way compression/dynamic hymbris and SET-friendly multi-way dynamic speakers like Silverline. etc.

The musical presentation is so incredibly different between those 4 major categories, and even within them, that you really need to arrange to hear other people's high-eff setups before making the jump.

As for amps, depending on the speakers you choose, you may not have to limited to 300B amps. There several other fantastic output tubes that equal, or even exceed, 300B's in many ways.

You've already heard and marveled at an Art Audio amp. The owner, Joe Fratus, considers their PX-25(which I own) to be their finest. It has 6wpc output, but out drives many 300B or other higher powered SET's. These sell here for $2,500-3,200 used regularly and hold their value at that price. Also consider their 845 based Carissa.

Welborne Labs 300B DRD or Terraplane monoblocks are amazing. DIY HiFi Supply's Lady Day+ monoblocks are great and have a large following.

I am afraid I am not a horn fan, but there are a number of companies making SET friendly speakers, which are not Horns(I have been on a similar hunt). If you can find 15watt + amps, you will make the search easier. I agree with darkmoebius, there are other SET valves you could consider. I personally prefer 845's, always with the proviso that amp design and component quality makes more difference than tube choice. As you know, output transformer size and quality is key.
Speakers to consider that are SET friendly:
Silverline
Daedalus
Reimer
Zu
Coincident
Zingali
The one I went for is not an obvious choice at 89db sensitivity, but a flat 6ohm impedence, makes it SET friendly. That is the Acoustic Zen Adagio, at the price, it is a steal. It needs 50+ SS watts, but 20 SET watts drive them just fine.