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I have owned Yaqin, it was enjoyable piece of gear and a great value. They sell several tubed and I believe 1 hybrid integrated amps as well as a tube buffer and a phono section. I only personally know 1 other person that owned Yaqin and I know for sure that he would tell you the same. I would do a search under the forums here. There won’t be a lot, but I have certainly seen it mentioned before. It would be nice to hear from people that have actually sat in front of it.
I had a Yaqin hybrid integrated. After the first week, it caught fire and almost burned my house down (NOT kidding). Thank God I was in the room at the time and I was able to run to the kitchen and grab the fire extinguisher. My upstairs room smelled for a long time after. At the time I bought it, it was only being offered on ebay. I got my money back through PayPal, but never again would I buy cheap Chinese junk. The amp was so cheaply made. Under the polished transformer covers was a transformer that you would use in a transistor radio, they were that small.
Like we used to say about certain cars, all show and no go.
If you want to get into a higher-power triode SET amp, it's hard to fault Yaqin or Valve Angel on a bang-for-buck basis, You might want to look at Bottlehead or Decware, too, And as roberjerman said above, speaker efficiency is key. Get a set on the 90s, they're available now, and some are really affordable.
But my listening space is pretty big so I need at least 40 Watts of Power.
Thus I am more inclined to Line Magnetic 508.
"Get a pair of Heresy's. Efficiency 99db at 1 watt!"
They are rated at 96db 1 watt/4 feet, and Klipsch is well known for their rating's being rather uhh, well, optimistic we'll say.
But they are very efficient. None the less. I like my Klipsch speakers. I have at least a couple in my pile, but I take their frequency response (at both ends), and sensitivity specs with a grain of salt.
Yaqin is a fine manufacturer for budget minded enthusiasts. I would not let their poor and very cheap hybrid designs infer anything about their all tube designs, but I'm not sure I would spend that kind of money on a SET design from them.
Yaqin is my my only recommendation for budget tube amps because I've heard enough of them now to know they are good values. All of those amps were push pull though, where transformer quality is not as paramount as it is with SET. I would expect these amps to completely fall apart with a 4 ohm load, much like my Shuguang amps do that are listed above. My favorite saying for those is that they never found an 8 ohm speaker that they didn't like, but they also never found a 4 ohm speaker that they did.
When i picked up MastersounD I fully realized how this statement was not true for all SET designs. Speakers that made my Shuguang fall apart were handled triumphantly by the Compact 845. With that said, even the Compact 845 can have limitations and not shine in every application. Such is the case with every amp.
If you are wanting to experience a high powered single ended amp and keep price reasonable, the MastersounD BoX should be high on your list. It offers more power at 35 watts and higher quality transformers. it has the balls of a good 845 amp and retains the single ended sound in a Pentode configuration. The BoX would run you about $500 more than the Shuguang separates but would offer a lot more in terms of sound quality, speaker options, and a lower noise floor with blacker backgrounds.
Another high quality manufacturer of tube amps all made in north America is Finale Audio - Triode Labs. i've mentioned them a few times here and there on the forms and after owning one of their integrateds for two years now I can't say enough good things. defiantly not too shiny or bling, all the money goes to the parts and transformers. I believe they have units starting from $1500'ish and up.
I use Heresy IIIs with a Dennis Had SEP amp with something like 12 watts per side...maybe 10 with my current KT77 tubes. He seems to be making only lower power SETs these days, including a recent listing (Ebay...the only source for new Had stuff, although I bought mine used) for a 2 watt PC SET "45"...I like the added headroom of my massive 10 watts, but can’t recommend these amps enough...hand made, absolutely beautiful sounding little gems. Otherwise the Coincident Audio Dynamo 34SE II seems like a cool little amp. Also, I wonder where the Heresy III "96db" rating info comes from as, although I’ve seen mention of Klipsch spec exaggeration here and there, is there an actual measurement out there somewhere that disproves the 99db spec? I wanna know, but don’t care all that much as my experience with the Heresy III is all good, and they’re far more efficient than anything I’ve owned other than pro audio stuff.