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Several years ago I purchased a Model 7C preamp at a local estate sale. It was in excellent condition with the exception of the two upper shock mounts missing. Not just a case of the rubber cushions missing or deteriorated, but the studs and acorn nuts were also gone. They had been replaced by two long screws and rubber grommets. I searched the web for “off the shelf” replacements and soon gave up after not finding any that were suitable in terms of both size, function, and cosmetics. Fast forward to October 1. The “Marantz tube preamps” post by member unclestu reignited my search.
Here is the link:
http://www.audioasylum.com/forums/vintage/messages/21/218471.html
Within this thread, member Steve O stated that he purchased a set of mounts from McMaster Carr. The two issues that I have with these: 1) The rubber cushions are round, not square. 2) The studs need to be trimmed down.
I started a new search on the web and found a company named Stock Drive Products. Under their product listing of Vibration Mounts, there is a sub-category called Square Mounts. I found a set of mounts where the cushion size, stud length, and stud size (#8-32) matched the original Marantz mounts exactly. This comparison is based on examining and taking measurements of a friend’s Model 7 that he purchased new. The serial number is 19xxx. Plus I had the original single lower mount from my M7 for comparison. Anyway, I purchased two different sets from Stock Drive. One set had a slightly more compliant rubber cushion than the other. The part numbers are A10Z 1-322A (blue cushions) and A10Z 1-322B (brown cushions). I am including pictures of each in this post.
By the way, if I had the original hardware for my upper mounts (studs), I would probably rebuild them with new rubber or the frequently used cut-outs from a mouse pad.
The link for the Stock Drive Products mounts is: https://sdp-si.com/eStore/Catalog/Group/521
My Marantz Model 7C with 1 inch screw and rubber grommet
Picture of an original bottom shock mount from my friend's unmolested 7C (SN 19xxx)
Picture of an original top shock mount from my friend's 7C
Shock mounts from Stock Drive Products. Piece of a mouse pad on far right
Original studs next to new top mount before installation
Original studs next to new bottom mount before installation
New top mount after installation
New top mount 2nd view
New bottom mount after installation
New bottom mount 2nd view
Follow Ups:
Nice detective work.
I have not seen green original shock mounts before on Model 7's so that shot of your friend's unit was interesting.
Not having the hardware to rebuild solved!
I introduced the rebuild thing here:
AJ,
My friend purchased his Model 7 new while he was a technician, servicing Marantz, beginning in the 50's . When I asked if the shock mounts had ever been replaced, he said no. However, he is an older gentleman and he may have forgotten. I will begin to pay attention to late serial number Model 7's and see if I spot anymore blue-green ones.
David
Great! ... all the ones I have seen have been black . Enjoy the pre!
Very cool! I hope to be able to use this information. I have yet to find a 7C in a thrift store, but I'm still looking!
Dave
Very nice, great pics too.
ET
Really appreciate your sharing of this very specific detail on the revered Marantz 7C. I found your pictures and post very informative.
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