Iec Socket/Mains Fuse; Orientation Of Valves - Gibson “Goldtone” GA-15 Operating Instructions Manual

During short breaks the amplifier can be switched to standby and will therefore be ready
to play when next needed.After switching off it is recommended, as with all valve
amplifiers, that it does not receive any sudden physical shocks while the valves are still
hot, i.e through moving the unit. If possible try to give the amplifier a few minutes to cool
down before transporting it.
IEC Socket/Mains Fuse (All Models)
The IEC socket is for connection to universally used IEC mains leads to connect to
appropriate domestic mains supply.
In the event of having to replace the mains fuse always use the same rating and type as
marked on the unit's rear panel. Using one of higher rating will invalidate the guarantee.
If after replacement the mains fuse should blow a second time, immediately refer the unit
to an approved service engineer for checking.
Orientation of Valves ("Goldtone" GA-15 & GA-15RV)
Looking at the "Goldtone" GA-15RV from the rear with the rear panel removed you will
see four valves, the two on the left (V1 and V2) should be ECC83/12AX7's and the two
on the right (V3 and V4) should be EL84/6BQ5's. For improved performance and
reliability the EL84/6BQ5's should be a matching pair.
If need should arise to replace any of the valves we recommend the following types:-
V1 and V2
V3 and V4
Orientation Of Valves ("Goldtone" GA-30 RVS only)
Looking at the "Goldtone" GA-30RVS 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.
8
Sovtek 12AX7WB or 12AX7WA
Sovtek EL84M
Sovtek 12AX7WB or 12AX7WA
Sovtek EL84M