I came across the 12BH7A valve for the first time, when I recently received my upgraded Croft Micro25R preamp (used in the line stage) and my Croft Series7R monoblocks.
Unfortunately the Sylvania 12BH7A (green lettering) of my preamp had a serious deficiency in the treble (roll-off), that led me to believe that it must have obviously been a faulty one. Currently I am using a Philips 12AU7 instead, which is quite good, but does not have such a full body in comparison to the 12BH7A. So I am looking for a substitute 12BH7A NOS valve to do justice to my Croft preamp.
Anyone with experience with 12BH7A valves? Which models are worth going for? Where could I find a good source for such valves? Is there perhaps a compatible substitute for 12BH7A valves, that is also worth considering?
Thanks in advance for any information.
Cheers,
Panos