I am not familiar with your Wyetech amp, but I owned a Joule Electra OTL amp and SET monoblock amps at the same time. The Joule was a VZN-80 MKV, Musicwood edition. The SET amps are a pair of Coincident 300b Frankensteins. I had both of these amps in my system for 7 months and spent a lot of time going back and forth between OTL and SET.
Enough has been said about the Frankensteins on this forum.
I will just say they are surprisingly neutral, transparent, and live sounding, unlike
the fat and fuzzy stereotype that some have of SET amps. They are also quite
dynamic with the right speakers.
As for my Joule Electra, it was a fantastic amp. I used it
mainly with Merlin speakers. The amp can play with a wider variety of speakers
than most SET amps. One should know however that power drops when going into 4
ohms; power does not increase into 4 ohms like some amps do. That said, I used
mine with Quad ESL-57’s with good results. My daily speakers were Merlin VSM’s,
a wonderful match with Joule amplifiers. With a little negative feedback, the
amp was deliciously ripe sounding and full bodied (noticeably more so than my SET amp), at the expense of a little bit
of transparency. The amp produced really
nice tone. The soundstage was huge in all dimensions (even larger than the Frankensteins). I sold it because of the heat generated by
the output tubes. Also, I would make sure that the output tubes are readily
available. I bought new tubes 2 years ago, but found that a lot of tube sellers
were not carrying them anymore, or if they did, they were asking high prices.
Even the usually reliable Russian dealers did not have them in stock. My Joule
was a labour of love. Great care needs to be taken to keep it hum free. With
all those tubes, it can be a pain to diagnose. I was able to get my Joule to
run quietly, but others have complained about not being able to get rid of the humming
noise, which can be heard through the speakers. I would feel much more confident
if buying the used pair that Signature Sound just listed. Is that the pair that
you are looking at?