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Super Mark 1 Modification

If you have a Mark 1 and would like to take it to the next level the modifications I have will do just that. Modifications for discrimination, ground balance, phase control, sensitivity increase etc. These modifications are not hard to do and if you have a little background in electronics and can solder then you can do it yourself. I have spent several years going over every last little bit of performance gain that the Mark 1 has with George Payne and its in here. All of the Mark 1 modifications are listed and what each modification does and all for $10. I can mail a printed copy or send a full copy by email. Thanks

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