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Orientation Of Valves
Looking at the VELOCETTE TWIN from the rear with the rear panel removed you will see
eight valves, the four on the left (V1, V2, V3 & V4) should be ECC83/12AX7's while the
four on the right (V5, V6, V7 & V8) should be EL84/6BQ5's.
V1 is used for the input gain stage and 2nd gain stage
V2 is used for the 3rd gain stage and cathode follower that drives the tone network
V3 is used for the left side phase splitter
V4 is used for the right side phase splitter
V5/V6 are left side power stage valves
V7/V8 are right side power stage valves
If the need should arise to replace any of the valves we recommend the following types:-
V1, V2, V3 & V4
V5, V6, V7 & V8
For improved performance and reliability V5 & V6 and V7 & V8 should be matched pairs
respectively.
Technical Specifications
Input Impedance
Tone Control
Reverb
Send
Left/Mono Return
Right Return
Circuit Topology
Speaker
Power Rating
Sovtek 12AX7WB or 12AX7WA
Tesla EL84 or Sovtek EL84
Hi-1MΩ
Lo/Link-136KΩ
Single dual function passive control
3 spring tray with modified output to produce
pseudo stereo reverb effect
Impedance 10KΩ
Nominal signal level -20dBu
Impedance 470KΩ
Nominal signal level -20dbu
Impedance 470KΩ
Nominal signal level -20dBu
Preamp and power stages 100% valve
Reverb and effects loop sections driven by integrated circuits
Two 10" Celestion Vintage 10's
~2 x 15WRMS per side stereo (~30 WRMS total)
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