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Comments
I personally like the Sovtek LPS as a driver over the JJ
http://www.hotroxuk.com/svetlana-el34-winged-c-valve.html
I've also heard good things about the reissue Mullard CV4004 12AX7 / ECC83 - next on my list try:
http://www.tubeampdoctor.com/en/shop_Other_brands_OEM_Tubes_Preamp_doubletriodes/Mullard_CV4004_12AX7_Russia_4894
My experience with the last few years of =C= production was the the EL34s weren't that durable, although sounded very good.
Current production Shuguang EL34s are actually very good now a flaw in the internal wiring has been corrected.
I've had mixed results with JJs. Generally they have been good, but a few years ago I started seeing an increase in failure rate, so switched over to the improved Chinese EL34s.
What is it about your tone that you don't like or want to change? What have you currently got in V1 and V2? (They look like Tung Sols to me) The other 2 look like Chinese 12ax7s.
v1: Tung Sol
v2: JJ/Chinese
v3: JJ/Chinese
v4: Sovtek LPS
Power valves: JJ EL34s