i've heard both tunas, but not in direct a-b comparison. that said, i tink i'd choose the tandberg for sound. these can be wery spendy to keep maintained, tho - assume the presets will get stuck & need a few hundred-dollard-worth to make right, if not done recently - these tings are gettin' old, now... ;~)
re: differences between 3001 & 3001a, heinz preiss, who works on these, & other off-beat euro-stuff (telefunken, grundig, electrocompaniet, among others), sez the only difference is the 3001 is silver, the 3001a is black...
dunno about websites for this tuna, mebbe tandberg? the owner should be able to brief ya on the features; look for an old oct isue of audio for the specs...