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Topics - Major Bloodnok

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A comment by AndyP, in a separate thread ('Embrace my 79 Stage timbre, or start ripping things apart?') about bringing his Mark II up to scratch, prompts me to think again about soundproofing my Mark I Stage. Tinkling from the innards is not a problem when the amp is fairly cranked up; but when family life obliges me to practise with (closed circumaural) headphones, my activity is still not 100% silent.

AndyP reports some success in this regard with some spare Dynamat, applied to the inside of the harp cover. This is marketed as an automotive sound-attenuating product. My guess would be that such a material applied to my Mark I would work primarily by reducing resonance within the enclosed space, rather than damping vibrations in the cover itself. Possibly the Mark II cover behaves differently, but the Mark I harp cover is a fairly loose fit, especially at the ends. There is also an unnecessarily deep cut-out at the front to accommodate the output jack and controls, such that there is actually a tiny gap between the edge of the cover and the top of the namerail here.

I thought, therefore, that I might first try out ways of effecting a better closure around the harp cover, with a view to reducing direct acoustic leakage, if I can do so without making it unduly troublesome to remove and replace the cover for the purpose of occasional essential tweaks. Judicious use of adhesive-backed foam draughtproofing strip might be a good place to begin. I will report in due course.

In the meantime, has anybody here experimented with soundproofing the Rhodes?

I suppose also that, if I make a really efficient seal and thereby reduce ventilation, I must consider condensation. What will happen if, after I replace the harp cover on a warm, muggy day, room temperature drops on a winter’s night? Perhaps it would be a good idea to place one or two silica gel dessicant sachets in some accessible location within the piano?

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Until fairly recently (earlier this year), it was possible to find downloadable service information for Fender amps on the official Fender site. This seems to have been withdrawn, ostensibly because of Fender concerns as to liability if home techs should come to grief after taking a screwdriver to their equipment.

I had already downloaded from Fender the service manual for my '65 Twin Reverb Reissue, and copies are anyway still to be found on several other sites, either of the whole manual or of its included schematic. However, the '65 TRRI is a current production model, and the innards of mine, dating from c2017, differ in several significant respects from the FMIC drawing 037627rev.E (notably the power supply wiring, and an ancillary pcb which has replaced the neon optocoupler in the tremolo (so-called 'vibrato') control circuit). Despite Revision E dating from October '96, it is the only schematic version I have so far encountered in the wild.

Continuous product development is fine - it's still an authentic Fender with the basic design essentially as per original 763 circuit - but it is frustrating to find information on the official Fender site with no update in 24 years. Presumably, this problem is not confined to the TRRI model.

It seems also to be impossible now to contact Fender direct on this matter (consistent with their withdrawal of the downloadable manuals).

Does anybody please know of any source(s) for more up-to-date schematics of current production Fender amps?

I am hoping that this amp will outlive me; and I do not imagine it will be any easier to track down a schematic for it a quarter-century hence. Better, therefore, that I should find one now and squirrel it away for posterity.

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