Tube Effects Loop - Trinity Amps Tube Effects Loop Builder's Manual

TUBE EFFECTS LOOP

This is a 6N17B sub-miniature dual-triode vacuum tube-based series FX loop. It employs high voltage, has zero-
loss, is built on a PCB and includes an optional true-bypass switch.
This all tube FX loop add-on module can be fitted to virtually any guitar tube amplifier.
The FX loop is optimized for insertion between preamp and driver stages, the low noise, non-clipping, analog
effects loop utilizes a 6N17B sub-miniature dual-triode vacuum tube. It is designed with a cathode-follower
send stage and a return gain stage both of which can be adjusted. The mounting requirements are simple
(Power, Ground, Signal In, Signal Out, 2 heater wires) and it is held in place by chassis mounting the ¼" jacks.
Power drain on the B+ is minimal and the unit features a voltage regulator to minimize noise and simplify
installation. This eliminated the need for a voltage dropping resistor. Similarly, heater current draw is minimal.
The 2 internal trim (level) pots that can be accessed directly through the jacks (no chassis removal) or internally
by using a small flat-bladed screwdriver.
The PCB footprint is small (3 holes), yet both the send and return levels can be adjusted for nearly any loop
requirement. Low cost stomp boxes and pedals work just as well as thousand-dollar rackmount effect units.
The Send is configured as non-interrupt, so it can be used as a Preamp/Slave Line Out. When no connection is
made, the unit accurately passes signal but there is also an optional panel mounted true bypass switch.
This FX loop kit makes inserting any effect or pedal, less intrusive to the tone of your OSD.
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