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Scotty Sle
I.
Introduction.
Thank you for purchasing the Scotty's Sled Shed Custom Probe Modification Kit for Knight Signal Tracer
models 83Y135 and G-690. The units are identical in structure and only the 83Y135 manual is readily
available.
This kit was developed to help fellow vintage electronic enthusiasts. The Knight Signal Tracers are a well
built unit but are often found missing the probe or the probe is beyond repair.
The original Probe had the RF demodulator circuit built into the probe. The probe end twisted from RF to
Direct function to bypass the demodulator circuit. This twist functioned as a switch.
Multiple online forums of building probes with pill bottles, copper tubes or other apparatus with a
switch just makes for a cumbersome probe.
What this kit does is bring the RF demodulator circuit and switch inside the Signal Tracer. I have not
found a measurable difference in sensitivity as the gain on the Knight Signal tracer is more than
significant to overcome the loss of a 40" coaxial lead.
The demodulator circuit is the same as the manual, we have just moved the location of the circuit which
provides the use of a more practical test probe.
I also offer a complete restoration component kit that provides a replacement for every resistor, diode,
and capacitor. Please email me at
https://www.ebay.com/itm/175892511123
Scotty's Sled Shed Probe Kit Installation guide.
Knight 83Y135 and G-690 Signal Tracers
mysledshed@yahoo.com
Copyright Scotty's Sled Shed LLC 2023. All rights reserved. This
document is not permitted for open distribution.
or visit my eBay store listing at:
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Summary of Contents for Allied Radio Knight 83Y135
- Page 1 Scotty’s Sled Shed Probe Kit Installation guide. Scotty Sle Knight 83Y135 and G-690 Signal Tracers Introduction. Thank you for purchasing the Scotty’s Sled Shed Custom Probe Modification Kit for Knight Signal Tracer models 83Y135 and G-690. The units are identical in structure and only the 83Y135 manual is readily available.
- Page 2 Scotty’s Sled Shed Probe Kit Installation guide. Scotty Sle Knight 83Y135 and G-690 Signal Tracers Before you get started there is a list of items to be aware of. Due to constant supply chain challenges, Scotty’s Sled Shed reserves the right to substitute component OEMs.
- Page 3 Scotty’s Sled Shed Probe Kit Installation guide. Scotty Sle Knight 83Y135 and G-690 Signal Tracers Preparation 1. The first thing to prepare is where you would like to install the switch. I installed the switch on the front panel adjacent to the input connector. This was a more practical location for my bench, but you may choose another location that suits you better.
- Page 4 Scotty’s Sled Shed Probe Kit Installation guide. Scotty Sle Knight 83Y135 and G-690 Signal Tracers 5. Next prepare the circuit assembly. It may be easier to assemble in the direction shown left to right in the original schematic. With the L of the center lug facing toward you, install the assembly as shown.
- Page 5 Scotty’s Sled Shed Probe Kit Installation guide. Scotty Sle Knight 83Y135 and G-690 Signal Tracers 7. Turn the assembly around 180 degrees and install the assembly into the same hole you removed the nut and bolt and reinstall the nut and bolt. There is another solder lug board on the other side of chassis.
- Page 6 Scotty’s Sled Shed Probe Kit Installation guide. Scotty Sle Knight 83Y135 and G-690 Signal Tracers • Lug 1 of board to Lug 1 of switch. • Lug 5 of board to Lug 4 of Switch (do not jumper to lug 5 of switch. The arrow is just showing signal path).
- Page 7 Scotty’s Sled Shed Probe Kit Installation guide. Scotty Sle Knight 83Y135 and G-690 Signal Tracers Copyright Scotty’s Sled Shed LLC 2023. All rights reserved. This document is not permitted for open distribution.
- Page 8 Scotty’s Sled Shed Probe Kit Installation guide. Scotty Sle Knight 83Y135 and G-690 Signal Tracers III. Completion and tests. Congrats you have completed the modification. Now you will attach the probe and test your installation. 1. Attach the included label above or below your DPDT switch.
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