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« on: August 08, 2020, 1754 UTC »
As a long-time R-75 user, I agree that the internal speaker isn't that great - but it's intended for utilities (primarily sideband) and voice. I used an outboard Heathkit mono amplifier fed from the Record jack into an external speaker and it was quite good.
The dual PBT certainly does work, although only one of them works in AM mode. The filters also work quite well - but you have to tell the CPU that you've installed them by going into the menu and selecting each one. As Chris said, ya gotta RTFM!
The noise is generated by the power wart, NOT the receiver! I installed .01uF disc capacitors across the diodes in the power wart, which reduced the noise. To eliminate it completely, run from a external DC supply.
I purchased the R-75 somewhere around 20 years ago and only sold it after I picked up an Icom 756Pro3 (with no xmit) as a high-end rcvr. The R-75 is a flexible unit that you can customize to *your* specific interests, and there are a few easy modifications to improve it even more.
In my opinion: If you can find one at a good price in the used market it's still a good buy.