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Note that OS/010, the diagram for the add-on Top Boost unit, references OA/026, not OS/065. The owner of this sheet will provide a description in due course. The other is dated 14th June 1963, which may mean either that it has additional entries up to this point, or that it is dated 14th June 1963 in the information panel and that all 'modifications' have been silently incorporated in the diagram. There are apparently two versions of this sheet. It is not known at present who printed sheets for JMI.Ĭlick on the images below for larger downloadable versions (3600 pixels wide). The company that printed the engineering drawings for 'Vox Sound Limited' in its original incorporation (1970-1973), was 'A.

Engineering drawings of various elements - transformers and so on - will also have been made. Note that no JMI sheet has come to light so far for the AC30/6 with integrated top boost (controls in panel).Ĭircuit diagrams of course are only part of the picture. Surely somewhere there must be earlier versions/issues? Westrex and Burndept, the two principal contractors that assembled chassis for JMI, are likely to have had multiple copies along with their own wiring diagrams.

The notes 'ISS.' suggest that at certain points other sheets - ISSUES - were produced for use outside the factory.Ĭlearly in 1962, OA/026 and OS/065 would not have changes relating to 1963. Leaving aside their quirks, OA/026 and OS/065 have all the appearance of being master sheets, corrected and brought up to date by erasure and redrawing. OS/065 was circulated in the UK too though.

OA/026 was the sheet included in the Thomas Organ Service Manual of 1966, and seems also to have been the one more frequently sent out to service engineers in the United Kingdom. The circuit for the AC30/4 will be provided on a separate page.Īs for the sheets below, OA/025 and OS/065 are to all intents and purposes one and the same - 'Works Use Only' first drawn out on 29th April 1960 same list of additions and dates down the right-hand side the final date 11th September 1964. It seemed rather redundant to gather together copies of things that are currently in circulation in publications and on the web. The circuit diagrams on this page all come from hard copies - sometimes copies of copies - made numbers of decades ago.

Vox ac30cc2 schematic