Rear Panel - TRACE ELLIOT Bonneville Operating Instructions Manual

the amplifier. The two master volume controls are foot switchable, enabling two levels of the same sound
to be set up.
Standby/On Switch
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As the name implies, this switches the amplifier from STANDBY mode, where only the valve heaters and
relay circuits are on, to ON for actual use. This should be used correctly every time the unit is used to
prevent problems with valves and increase their life.
Before the POWER is switched on (rear panel), make sure the STANDBY switch is in the standby position.
After switching the power on, wait at least 30 seconds before switching from standby to on. This will
ensure that the valves have time to warm up before large voltages are applied to the plates. During short
breaks the amplifier can be switched to standby and will therefore be ready to play when next needed.

REAR PANEL

Footswitch Sockets
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One footswitch is supplied with each unit. This will operate in either footswitch socket.
One socket allows the effects loop to be switched on or off and the effects loop to be switched from series
to parallel mode. With effects off and in series mode the signal is muted, this is useful for quiet passages
with no guitar, for tuning or for between songs when no background noise is wanted.
The other socket enables switching of MASTER I & II and, where applicable, REVERB ON or OFF.
Effects Loop
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This has sockets for SEND and RETURN and levels for each as well as a switch for SERIES or PARALLEL
configuration.
The SEND LEVEL sets the level of signal out of the SEND socket. This is for connection to the input of
effects units. It can also be used as a line out.
The RETURN socket is connected to the output of the effects unit used and the RETURN LEVEL (EFFECTS
LEVEL on head version front panel) sets the level of the effected signal in the overall sound.
The SERIES/PARALLEL switch alters the configuration of the effects loop.
In SERIES mode the whole signal comes out of the amp, into the effects and then back into the amp,
whereas in PARALLEL mode the effected signal is mixed in with the original dry signal, thus retaining total
purity. When the switch is set to PARALLEL the function is also footswitchable. The choice of which mode
to use will depend on what kind of effects unit is used and what overall effect is desired.
POWER AMP CONTROL
Speaker output socket & impedance selector switch
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The Bonneville has connections for driving loads of 4Ω,8Ω or 16Ω depending upon which socket is used
and how the switch is set.
In one position the two sockets are for either 4Ω or 16Ω, as indicated on the unit, whereas with the switch
in the other position either socket can be used to drive an 8Ω cab or both sockets can be used to drive two
16Ω cabs (in parallel),also indicated on the unit.
When using more than one speaker cabinet the overall effective impedance should be correctly worked out
and the appropriate socket used.
For two cabinets in parallel this can be done as follows:-
ZT (total impedance) = Z1 x Z2
Z1 + Z2
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