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Building a DIY battery phono stage

Posted by Michael Amster on December 7, 2001 at 16:19:52:
Hi:
I am a DIY beginner, though I have an EE background. I have looked at a couple of the battery powered Phono stages out there like Thorsten Loesch's Analog Addict stage and Klaus Boening's Dr. Groove II stage. Both look like they can be done by beginners and have good results. If anyone has built these, I would love to correspond.
Anyway, here are some questions:
1. For the Analog Addict 'El Cheapo' phono stage, where does one find a 10H 30ohm DCR inductor? If I could source this, I think I would start with this one first.
2. Which battery chargers are people using - I found a source for Yuasa NP 2-12 batteries, but would like reqs on chargers for parallel charging.
3. What's the difference between the OPA637AP and OPA637BP? I looked at the TI/BB site and there is little mentioned. Are these different grades of the same chip?
4. For the Dr. Groove, what 9V batteries/charger do people recommend?
5. What are the maximum MM input voltages for clipping? My Goldring 1042 is rated for a high 6.5mv. The El Cheapo was tested with this, but I am not sure about the Dr. Groove (looks like I could always lower the gain to make it work).
Thanks a ton. Reading the archives has made me eager to start a DIY project.
-MA