Wiring a M78S for mono on a stereo turntable

FAQ #1604 Updated February 23, 2018

Question:

OK, I understand the M78S is really a stereo cartridge, but how do you wire it for mono playback. My turntable has the standard stereo 4 wires (L, LG, R, RG). For now, I just have one channel wired and have the amp set up to play 2 channel mono.

Which channel plays the vertical in the groove and which channel is horizontal (for mono 78's). I'm looking for the least groove noise.

Answer:

Some 78 RPM records were modulated in the vertical plane; some in the horizontal plane. The M78S is very compliant in both planes and will play either type of record well.

There is no "correct " answer to your question. Which wiring scheme works best may be different from record to record. Try this order: 1) Left and Right channels in parallel; 2) Left channel only; 3) Right channel only. Use whichever provides the best sounding result.

The M78S works well for 78 RPM records for one main reason: the large radius of the diamond tip. The groove width of 78 RPM records require the stylus tip with a minimum radius of 2.0 mils. The M78S is 2.5 mils.

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