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What substitution tube types
do you recommend for the 
?

12AX7/ECC83:
12AX7A, 12AX7WA, 12AX7WA/7025, ECC83, E83CC, ECC803, 5751, 6681, 7025, 7729, CV492, CV8156

6N6P / 6H6П (cyrillic):
no substitution; available factory-direct only from LAMM
NOTE: we recommend replacing 6N6P tube about once every two years to maintain the best performance of the amp

6AK5:
6AK5W, 5591, 6096, 6968, 5654, WE403B, EF95, 6F32
(second choice:) 6AU6, 6AU6A, 6136, 7543, 8425A, EF94

5651A: 5651

6C33C-B: 6C33C