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- A,
B exclusive selection
- ground-referenced
jfet shunt switch elements
- silent
operation
- push-on
push-off remote switch provided
- 6-poles
included; infinitely expandable
- use
for channel muting or selection
- use
for gain selection via cathode-bypass caps
- low
current consumption of 2mA
This
kit uses "shunt" switch elements for silent, reliable
channel selection or gain stepping. Four transistors
create and control two control lines that respond
to a remote footswitch. Any required number of jfet
switches can be connected to these lines. For example,
using the ERK to select the channels of the
Guitar Preamp Kit or
the Fender Preamp Mod
requires one jfet on the control line to mute the
'Clean' channel, and two jfets on the second control
line to mute the 'Lead' channel.
Power
is easily obtained from the raw bias supply or the plate
winding in typical tube amps. London Power's
Power Supply Kits (62VA, 223VA,
383VA) provide a separate
auxiliary winding for switching circuits. The layout
indicates circuit card construction, with those materials
available in the Circuit Card Kit,
but more experienced builders may choose perf-board
or PCB construction.
About
London Power Kits
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Ordering
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