Acquired 2026-06-06 at the Rockland Hamfest. Serial number __. I do not yet know if the ALC repair was made.

My unit came with a no-name SO-3 clone installed, with the jumpers in place (meaning the TCXO was running in parallel with the original XO). I have removed the jumpers, and will test the characteristics of the TCXO. I am exploring building an alternative TCXO replacement, as SO-3's are expensive and require the original daughterboard be present.

Mark W7MLG made such a replacement in 2017. He used a made-to-order TCXO with a 3v3 LDO and trimmer potentiometer. Not much information is provided regarding the technical details.

1. https://sites.google.com/site/markstcxo/
2. https://qso365.co.uk/2018/02/installing-a-good-quality-tcxo-from-mark-goldberg-w7mlg-into-my-kenwood-ts-590sg/