I am not finished with the HR-10 yet. A performance test is a little premature. Still, that is just what I did today. With the LA2OLD net running on 80 meter I listened using both the HR-10 and my old Grundig Satellit 2000 from about 1975. I should say, the Satellit 2000 was an expensive receiver at the time. It’s versatility and performance justified the price. HR-10 from the early 60’s was marketed as a “basic receiver” for amateur use only.
Listening, first on AM then on SSB, the Satellit won hands down. I switched the 80 m halfwave dipole between them to compare. That dipole is of course much better than the telescopic antenna built into the Satellit. Still, the Satelitt with its own antenna did better than the HR-10 on the big dipole. Strong stations sounded much better on the Satellit. Weak stations that were unreadable or even below the noise floor on the HR-10 could be read on the Satellit.
Frequency stability of the Satellit is also much better. Something that is very noticeable on SSB.
Is the HR-10 a lost cause?
NO. I enjoy playing with it. The tuning dials are nice because they are made for amateur bands only.
I think there is room for improvement. Except for realignment that I have mentioned before, I think all electrolytic capacitors need a check and possible replacement. I am postponing that until I get working on the DX-60 so that I can borrow an ESR meter and order many capacitors at the same time.
Also, I think the preamp should be made switchable. One way or the other.
Instability may be curable with zener diodes in the power supply.
Never heard of Grundig Satellit 2000?
150 kHz to 30MHz in 20 bands, except for 400-500 kHz. That’s AM with selectable bandwidth (2.5 or 5.5 kHz). 8 of the bands are bandspread BC bands, two of which also includes ham bands (40 and 15 meter). Also 87-108 MHz FM.
Optional SSB 2000 unit containing BFO and a product detector I actually understand (unlike this one). Also has a switchable audio filter that is useful for SSB and good for CW. A switch to disable AVC and an MVC potmeter which we would usually call RF gain.