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The JJ / Tesla ECC832 can be used in place of any 12DW7 or 7247 tube.
It's an excellent option for old Ampeg amps.
COMBINATED DOUBLE TRIODE
ECC832 is 12DW7 pre-amplifying double triode. It combines 12AX7 and 12AU7, where the 12AX7 is used as 1st stage and the 12AU7 as 2nd stage.
In the 12DW7/ECC832, Section 1 of the tube (pins 6, 7, and 8) is the high gain 12AX7/ECC83 spec (gain factor 100) and Section 2 (pins 1, 2, and 3) is the low gain 12AU7/ECC82 spec (gain factor 17).
ECC832 (T-12DW7-JJ-X) | ||
Section 1 | Section 2 | |
Pins | 6, 7, 8 | 1, 2, 3 |
Gain | Factor of 100 | Factor of 17 |
Spec | 12AX7/ECC83 | 12AU7/ECC82 |
ECC823 (T-ECC823-JJ) | ||
Section 1 | Section 2 | |
Pins | 6, 7, 8 | 1, 2, 3 |
Gain | Factor of 17 | Factor of 100 |
Spec | 12AU7/ECC82 | 12AX7/ECC83 |