I used these in a Leben CS660p to very good effect. However I'm not sure if they are a direct EL34 equivalent (more like a 5881?) So might not work in a Radford.
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You may find the front end valves will make more of a difference than the power valves.
I have used them(6p3se)without any issues for 10 years or so in my STA15,a quick google search (el34 vs 6p3se)will tell you what other people who use them think of them. I agree Ali, rolling the front end valves can give a bigger bang for the buck
The JJ EL34s are an exact copy of the Mullard/Philips design. The Russian equivalent is the 6P27S (sometimes marked in Cryllic as 6П27C).
Prompted by this thread I remembered that I had got some new input valves for my STA25 but had never used them (lazy old git syndrome). Anyway got them in earlier today and shocked by the difference they made. Was using Mullard EFF86 and unknown 6U8A. Replaced with new (not NOS) Phillips EFF86 and Phillips 6U8A. The Mullards were old and probably had thousands of hours on them.
The new input valves gave a tighter sound all round, slightly brighter and more forward sound. And also some more detail. All very positive. :cool:
I didn't know Phillips still made EF86 the only recent ones I've seen are Russian (or rebranded Russian) with the pinholes rather than mesh plates.
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