has anyone heard the differences between psvane an

using expensive tubes I need help,buying direct from china I have better luck getting a matched quad than the canadian dealers that only stock pairs
You may want to contact the US based audiogon member Trelja. I am not sure if he matches up quads but he is the best businessman to buy from period price and quality with full testing on the better Chinese tubes. He has a comercial website, but for decorum and his own dislike of doing business on the forums I suggest that you try to contact him directly if possible. If not let me or us know and I will direct you to his website.
thank you for the advise,can you tell me how to reach him