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Output Section - Channel-1 direct out:
The direct out connects to the normal guitar amplifier. This also provides the usual ground path for the guitar. An on-off
channel output activation switch is provided. Thiswould be the first connection made.
Channel-2 thruChannel-6 primary amp drivers:
Adjacent to channel 1 are five transformer isolated outputs. These outputs feature Jensen Transformers to ensure signal
integrity and provide electrical isolation to eliminate 60 cycle ground hum caused by ground loops. A ground lift switch is
available to allow JD7-to-amp grounding to be lifted at any output. Many older vintage amplifiers use the chassis as the
neutral. These are often a source of noise when integrated within a system. Lifting the ground can often help reduce noise. A
polarity reverse switch is provided as an added creative option and for 'voice coil alignment' when combining mic'd
amplifiers with direct signals.
Channel-1, 2, 3 and 4 front panel output jacks, switches & LEDs.
Channel-1 on/off indica tor
Channel-1 on-off swit ch
Channel-5 & Channel-6 signal routing and effect loops:
Channel-5 and 6 are identical to channel-2, 3 and 4 with the addition of a
switchable effect loop circuit for each channel. Connections are made
on the back panel with normalling jacks so that if the 'loop' button is
depressed, it will have no effect unless a cable has been inserted.
As the effect loop jacks are not transformer isolated, it is a good idea to
power all your effects and the amplifier used with this channel from the
same power bar. This will reduce
transformer isolated output will then allow you to combine different
signal paths without added noise. The effect loop provides guitar level
outputs for use with standard guitar effects. Using line level devices
such as those normally used with mixers may require you to turn up the
effect's inputwhich could increase background noise.
Using the effects loops is essentially the same as if you were connecting
effects directly between your guitar and amplifier. Begin by inserting
the effects with the JD7 channel output turned off and the 'loop' button
out (inactive). Test your guitar amp connection by turning on the output.
Then, depress the loop insert switch to insert the effects. Adjust the
levels to unity gain so that when the effects are in, the level coming out
of the amplifier is the same whether the loop is in or out. You can always
increase the output as needed.
4
Channel-1 output
Direct coupled
On-off swit ch
susceptibility to
induced noise . The
Channel output - Transformer isola t ed
Polarity reverse - 18 0 º
Ground lif t
Channel on/off ac tive indica tor
Channel-5 front panel output jack, switches & LED.
Channel-6 effect loop rear panel send/return.
Effec t loop output
to guit ar effec t.
Outputs
Effec t loop bypass swit ch
Effec t loop input
from gut ar effec t.
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