We reached out to Geoff to see if he could recollect any information about these oddball modules and this is what he had to say…
“Rare as mermaid’s tears and the first time I have seen the module, the PCB and the transformer.
I’m not sure what you want to do with them. The B107 is a beefed up B106 emitter follower as found in the BCM10 routing unit and 31099/31102 channel amps.
It would be easy to clone with so few components and any modern power transistor would work.
Emitter followers have a high input impedance and low output impedance and have slightly less than unity gain.
I think the transformers are 1366 that are input transformers with 1:1 ratio and 600ohm input impedance.”
Looks we did good on these guys, now what do we make out of them? You be the judge. Get in touch with us if you have something in mind, we have currently have 4 modules available.