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Old 7th April 2008, 06:19 PM   #11
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Thanks. Do you know of a comprehensive source for 78 eq cap & resistor values for opamp preamps? I found Rod Elliot's site, and what I didn't like about his Project 91 http://sound.westhost.com/project91.htm was that it was too generic. I also found Roger Wilmut's site http://www.rfwilmut.clara.net/repro78/cct2.html which does have a comprehensive list of eq cap and resistor values, but it is for his discrete preamp and I am unsure about applying it to an opamp.

The Dual 1214 will be my 78 TT. It has a Dual DS630 cartridge with flipover style LP/78 stylus. I am thinking I will make a dedicated 2 channel 78 preamp just so it will integrate much easier with everything else. I believe the Dual cartridge just outputs the identical signal on both L & R.
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Old 7th April 2008, 07:31 PM   #12
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With split equalisation, it's quite easy to work out capacitor values.

A cartridge with a turnover stylus is almost certainly ceramic. Why not fit a Shure M78 (magnetic specifically designed for 78s)?
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Old 7th April 2008, 10:02 PM   #13
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Quote:
Originally posted by EC8010
A cartridge with a turnover stylus is almost certainly ceramic. Why not fit a Shure M78 (magnetic specifically designed for 78s)?
Hmm, that's goes beyond what I was hoping for in my project budget, but I'll think about it. The 1214 TT is actually higher quality than my JVC LP TT, but it has no strobe, so I think I'll dedicate it to 78 service.
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