Frank Forman here. You know me either personally or from my ARSC Journal 
discographies, one with Kenzo Amoh on Eygeny Mravinsky and the other, a 
three-part article on acoustic chamber music sets.

I inherited a Technics SL-1500MK2 workhorse turntable from the late 
Allen Mackler after he got such an overdose of music working at WETA-FM, 
in the DC area, where both of us lived, that he abandoned music 
altogether, despite having a splendid collection of classical 78s and LPs.

It worked splendidly for a long time, but now one or the other channels 
goes out randomly. The problem can't be frayed wires, for I need merely 
unplug and replug the extension cable to the cable that comes out of the 
unit, and the sound comes back in correctly, but only for a while, a 
decreasing while over the years.

I downloaded a manual (not a step-by-step instruction guide but rather a 
set of exploded diagrams and a parts list) off the Web, and it seems to 
me that all the fancy electronics in the turntable is given over 
entirely to speed control, not to the matter of the sound from the 
needle to the shell down the tone arm, and out of the unit with a pair 
of RCA-type male plugs, which plug into my integrated amplifier.

Best would be to get the turntable fixed (and not buy a used one on 
eBay, which goes for $600-$800), but barring that I'd like 
recommendations on a turntable that is "good enough" for me to make 
transfers to my computer, using a little box called INport, into which I 
use RCA-type plugs from the tape output of the amp on one end and a USB 
port to go into my computer on the other end. What is vital is that I be 
able to use two needles, one a 1 mil conical needle and the other a 0.7 
mil elliptical one.

Ion's USB turntables seem all to come with a cartridge that is a fixed 
part of the tone arm, so it seems I'll need a different brand of 
turntable. Since I have the INport box, I don't need a turntable that is 
USB-ready. I'll have no further use for a turntable after I have made 
computer files of my remaining LPs, so please don't recommend anything 
expensive, like over $200.