Re: Philips 834A and 274A. Substitute for B3 994V.
The 6AX7 is available from the Tubestore.com for $19.00. Also, the Russian equivalent 6N2P from an UK seller for £19.95p.
Might have a 6AV6/EBC91 somewhere in the shop.
6AV6 characteristics similar to 12AX7. mu = 100
DFWB.
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