In the end it took me a little over an hour to find the correct resistor and then, with some trial and error, determine the correct resistance to add in parallel to bring the pitch up to 750 Hz. two new ready-to-run trucks, the Arrma Outcast 4×4 4s & Arrma Kraton 4×4 4s. So without the ability to trace the circuits from the bottom of the board I had to determine the correct resistor to modify by tracing it backward to the correct pin on LM3900 by measuring resistance between components. Arrma Granite 4X4 V3 3S BLX 1/10 RTR Brushless 4WD Monster Truck (Green). The 80356 preamp audio board is directly connected to the AF and Selectivity knobs on the face of the radio and removing the board turned out to be more difficult than it should be (longer story not recounted here). I also mentioned making a cosmetic restoration, but after using it in the shack for an evening, it was apparent there were other problems. In the last post, I described a used Ten Tec Triton IV (aka Model 544) and addressed the most immediate issues. 2006 activ company with 37 years experience. Known as manufacturer of communication receivers like the Triton IV and Ham Radio equipment, also in kit form. For example, the schematic showed R1 as a 68K resistor but no such resistor with that value was on the board. Epic Restoration of a Ten Tec Triton IV Part 2. Sevierville (TN) 1185 Dolly Parton Parkway, Sevierville, TN 37862, U.S.A. But apparently Ten-Tec made some running changes to the pre-amp audio board because quite a number of resistor values on my board didn't match the values listed in the schematic. He told me that I needed to change the resistance of R1 in the 80356 audio preamp schematic. A kind ham ( WA4FOB) sent an email suggesting that I modify the op-amp circuit generating the sidetone.
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January 2023
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