I don't know what "very expensive" means. But the NOS Siemens EL34s sold by RAM Labs are superb at $140 a pair. For less money, the current production Winged "C" EL34s are very good, mayb $50/pair.
One other advatage of the RAM Labs Siemens is that in my experience there is nobody better at matching and testing tubes than Roger Modjeski. When dealing with tube nuerosis, I feel comfortable that Roger has matched the tubes. Another fellow would by Jim McShane, bought my SED EL34s from him and they bias very closely as matched quartets.
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