I bought a cheap amplifier on Aliexpress some time ago.After watching a lot of video's on it i decided to change the tubes for Russian old stock ones.In my search i ordered them here.In my comparison it was very cheap.4 sets of 4 tubes for under €50 shipped.While on Alieexpress you pay €28 for a set of 4.And the original Chinese tubes are lighter then the Russian ones.One of the Chinese was faulty so had to replace it anyway.It was very well packed and shipped very fast.At first i was a bit sceptical to order in Ukraine but i gave it a try.Maybe someone need something.It's worth a look i think.
https://www.etsy.com/nl/shop/kambrem...hopheader-name
Leon.