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Post by mitchfit on Oct 11, 2018 23:35:40 GMT
thought it better to continue this disgustion in the correcterest category.
[copied/pasted from oct 2 2018 in the "what are you listening to" heading due to abject laziness]
"did some followup listens to a few of Doug Beaumir's vids on Ubertube. in this one the neck he starts out on seems to have 4 push activated contacts to select between necks.
any guesses about why there is no audible "click" from the amp when he switches? more than meets the eye tech used for switch manufacture trickery? amp out put set very low? both?
seems like there would be some kinda artifact to itself"
END QUOTE
on oct 7 2018 at same place "pete1951" posted:
"Something that’s often done on amps is putting a large value resistor across the switch, I’ve never done this with the onboard electrics of a guitar but might be what he is using.
Might try a 1meg on the next guitar I wire up.
Pt"
END QUOTE
the 4 headed monster ~looks~ like it has a Fender name plate beside neck #4. not sure on that. can anyone ID this guitar(s) for sure?
viewing video again, MAYBE a delay between fully engaging neck switch 1 to neck 2 button release? not sure on this either.
if a model/make determination emerges perhaps further research will be possible.
mitchfit
PS--- "OLDNAT" PM sent.
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Post by mitchfit on Oct 18, 2018 2:33:05 GMT
"oldnat" was kind enough to send me this link three days ago. he even went to the trouble to find postings by Doug Beaumier himself. about the very same "stringmaster" in the video. knew from seeing jpgs "oldnat" posted about his guitars/amps that he would have good info on the Fender Quad Stringmaster and the video maker report is icing on the cake. some beautiful color close-ups of a beautiful instrument: bb.steelguitarforum.com/viewtopic.php?t=261574turns out he feels the noiseless source selector mentioned above is mostly a function of meticulous selector switching contact hygiene. even states he feels the instrument got an undeserved bad reputation due to the very well built, albeit complicated selector. live and learn. my thanks again to oldnat, mitchfit |
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Post by Stevie on Oct 18, 2018 8:26:05 GMT
Oh what a video! Lovely.
On the steel guitar forum thread, there is reference to copper contacts. Mayhaps they should have been silver plated? My morse keys' contacts are all silver plated, if they weren't (and with the microscopic switch open gaps needed) they'd rapidly generate unwanted dots.
Also in that thread, there is mention of the wiping action being used to clean the contacts? I suspect that the switches may be MBB rather than BBM, and this alone may explain the lack of pops and clicks.
e&oe...
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Post by mitchfit on Oct 18, 2018 17:54:07 GMT
Stevie said:
..."the switches may be MBB rather than BBM"...
thanks Stevie, i wasn't aware of the two different above mentioned abbreviated switch engagement designations until i google searched your terms.
onliest ways i foresee to move forward would be to luckily find a "gut shot" jpg of a stringmaster switch post dis-assembly [while being cleaned?]. or even less likely find an OEM Fender stringmaster schematic. top notch video playing programs with extreme slow-mo functions could prove/disprove my speculation about disengagement lag time of contacts in posting #1.
maybe easiest to just join steelguitforum to ask Mr. Beaumier himself. perhaps in the future. seasonal summer-to-winter transition chores await.
impatiently.
mitchfit
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Post by mitchfit on Oct 19, 2018 18:26:12 GMT
 thumbnail_quad switch 1.jpg (34.45 KB) Mr. Beaumier was kind enough to send these two "thumbnails" of the switch from a different stringmaster quad. he feels it would be make before break design. i agree. the conical shaped machining that is retained on the spring guide rod catches on the step at the bottom as it is forced beyond the contact plate which acts as a pawl to maintain the circuit. when another button gets pushed, the previous contact remains engaged until the second choice is pushed up to the cone ending, releasing pawl, which will then remain captured on the pawl contact. have found many very unique electronic design features from the the man who became his name sake company in fullerton, CA while researching this guit
1 both PUPs signals are being used with a blender pot as a "tone" control. more bridge signal = treble. more neck signal = bass. this controls frequency preference without dropping signal voltage, important in the early 1950's when low watt amps prevailed.
2 when both signals ~are~ used they create the first [what i read, but didn't validate] "humbucker" topography in a production guit.
3 this neck selector switch mechanism seems to be specifically designed to be noiseless, at great profit loss compared to "good enough" alternatives.
4 found a link showing a "quad" control pots body cavity that was lined with copper shim stock surround and grounded to circuit to prevent "radio" noise. didn't save page because the guy said he couldn't say for sure it was OEM. i should have asked Mr. Beaumier, but was preoccupied with switching circuit.
interesting instrument.
mitchfit
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Post by mitchfit on Oct 19, 2018 18:31:21 GMT
the ace computer jockey strikes again!!! dunno how i managed the line through letters, but it is still good enough to read. as slide496 would quote, "DO-OH".  same-oh for missing thumbnail!? the above posting sponsored by yet another day of rain. DO-OH! mitchfit |
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Post by Deleted on Oct 19, 2018 21:39:51 GMT
Oh--is that the time.
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Post by mitchfit on Oct 19, 2018 23:08:04 GMT
?
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Post by Stevie on Oct 22, 2018 11:38:43 GMT
The use of blend pot. architecture is no surprise MF because the early Broadcasters had just such a "tone control". The Esquire not having a second pick up to enable such trickery probably persuaded Leo along the different tack. As a radio serviceman first and foremost, it wouldn't have stretched his mind in any way.
e&oe...
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