Hello,
I see, which headphones are you using?
To help you better.
Because planar headphones work better with set based amplifiers than with an OTL amplifier, as the more set amplifiers have more power for planar headphones.
By the way, the Wa6 is an Otl but also very popular, especially on the US side.
And also not necessarily wrong if the price is right for a used one.
There are some other amplifiers like Cayin ha 3A,ha 2a,Icon Audio Hp8 works very well with high output headphones.
Some of them can be used with planar headphones.
Eufonika H5 would be an OTL amplifier that is good for beginners and not too expensive.
Feliks Echo is also a small OTL amplifier that is very solid and not expensive.
Alternatively, there are Chinese amplifiers from Xudoo which are ideal for a taster and keep the budget low.