I've seen at least one comment here and another at an online website that claim the SP-2A was the mono version of the SP-2. However; that conflicts with what I've seen in the Heathkit catalogs. All the catalogs show the SP-1 was the mono version that could be converted to SP-2 with a C-SP-1 conversion kit. The SP-2A doesn't show up in magazine ads until early 1960, but nowhere can I find what the heck made it an "A". Anybody know what the difference is and if there were any circuit changes?
June 1959 catalog
I know Heathkit made other cosmetic only changes like when they went from tan to blue test equipment and like when they went from gold chassis amps to black chassis amps like the difference between an AA-40 vs AA-121. Is there some cosmetic difference between the SP-2 and SP-2A?
Thanks, Matt
June 1959 catalog
I know Heathkit made other cosmetic only changes like when they went from tan to blue test equipment and like when they went from gold chassis amps to black chassis amps like the difference between an AA-40 vs AA-121. Is there some cosmetic difference between the SP-2 and SP-2A?
Thanks, Matt
Last edited: