Philps Holland, Mullard Holland and GB?. The Mullards can often be got very cheaply here in the UK as the world obsesses for the same tube with an Amperex logo on! (often think well under £10). If you forgo the Mullard logo you can get even cheaper and there are many examples you can buy from just the Philips family (read the people who owned Amperex)! Siemens E88CC / 6922 are a great more expensive tube many like, yet the majority of RCA 6922 I have ever seen have been made in Germany ;) and they are often much cheaper. There are loads of savings to be had for those who look. ECC88, E88CC, 6N23 etc all where made in huge quantities and many examples of great quaity tubes arewith cheap prices still, without having to pay the premium for the current flavour of the month (which ebs and flows). The best bargains are to be had in the ECC88s / 6DJ8s. To quote this old but well read web site:
Some of the best sounding tubes in this family are 6DJ8s and some of the worst are 6922s & 7308s. So take each tube on it’s own individual merits rather than judging it by its model number or pin material (gold pins do not necessarily = better sound).
There are loads of tubes out there but just because a tube say Mullard ECC88 does not mean there is only one type, often there are many, just like all the Russian variants talked about here recently. There is a tendancy here to call a tube a 'U52' or a 'Brimar 6SN7GT' when the reality is these are families of tubes often with diverse constructions over many years of manufacure often poorly labelled and maybe not even from the listed country!!.
Thanks for the info.