Pickering's First Stereo Cartridges 

1958 - 1962. The first 3 stereo models from Pickering. Pickering had a problem producing a cartridge with a decent response in the high frequency range. The frequency curves show an emphasis in the lower frequencies and a thin output in the higher range; and it's heard in the video. It wasn't until the release of the V-15 series in 1964 that Pickering was able to produce a cartridge with a balanced sound across the audible frequency range.