PL-15: The oldest model in the PL-x15x-series. The anti-skating was provided by a hanging weight, which was a bit more fiddly than later models, as the thread holding the weight had to be adjusted to the correct one of several different grooves to suit the cartridge’s tracking force. The standard cartridge supplied in some markets had a tracking force of 3g.
- Signal to noise ratio (S/N or SNR): greater than 47dB – this is how quiet the turntable is, and larger numbers are better, as the noise will be further from the signal.
- Wow and flutter: less than 0.1% WRMS – this is how much the speed varies for both wow (slow speed variations) and flutter (fast speed variations). Smaller numbers are better.
- Weight: 7.3kg
PL-15D: Slightly newer model, with a different tonearm of the same length, which was probably lighter than the one on the PL-15. It also had anti-skating provided by a spring, which could be adjusted to suit the tracking force of the cartridge by turning a knob to the appropriate setting, so it was slightly easier to set up. Turntable specifications were identical to the PL-15, except for it weighing slightly heavier, which may have made it marginally more resistant to acoustic feedback (howling). It also had a slightly improved standard cartridge (where fitted) with a lower tracking force of 2.5g, and a finer conical stylus (0.5mil versus 0.6).
- S/N ratio: >47dB
- Wow and flutter: <0.1% WRMS
- Weight: 7.5kg
PL-15D MkII: Slightly improved PL-15D, with marginally improved wow and flutter and noise specifications, although it would probably be very hard to hear the difference. It was available for sale in 1975, according to the turntable ‘directory’ in Audio magazine, October 1975. The earlier models weren't shown in previous directories, so may not have been available for sale in the USA, although the lower-priced PL-12x was.
- S/N ratio: >48dB
- Wow and flutter: <0.08% WRMS
- Weight: 7.5kg
- Cost $129.95 (USA)
PL-15R: Very similar to P-15D MkII, and identical specs.
- S/N ratio: >48dB
- Wow and flutter: <0.08% WRMS
- Weight: 7.5kg
There was also a later model, the PL-115D, which replaced the PL-15x-series and superseded them.
PL-115D: Very similar to the PL-15x, but improved slightly in wow and flutter and signal to noise ratio. The tonearm had also changed slightly, and now included a lateral weight. Whether that was an improvement was debatable. Most later-model tonearms didn’t use a lateral weight, so I suppose that Pioneer and other manufacturers decided that any improvement was so marginal that it wasn’t worth the cost of manufacturing it. The PL-115D weighed less than the PL-15/15D/15R, and was for sale in the USA in 1976-77, for a slightly lower price than the PL-15D/II had sold for.
- S/N ratio: >50dB
- Wow and flutter: <0.07% WRMS
- Weight: 6kg
- Cost $125 (USA, 1976-77)
The PL-115D was replaced by the superior PL-514 in 1978, at the same price – the PL-514 was much quieter, and had much lower wow and flutter (65dB & 0.055%).