It's always good for an Englishman to hear all those names together David. Jim had Burns and he and Bob Pearson designed Haymans and Jack Golder who was an ex Burns employee along with Norman Houlder did the Hayman woodwork but also the Shergolds so one big happy family really. Jack's old works is only about 15 miles from me and we did meet several times. Sad when he died back in 92 and I went back up to buy some fingerboard stock being sold off. God knows what happened to all the Flight bodies that were sitting in the racks there. Probably the same as all the old Vox bodies in my old place. Kept the place warm in the winter.
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Stacked humbucker bobbins / les paul recording pickups
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Originally posted by jonson View PostKept the place warm in the winter.It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure. — Albert Einstein
http://coneyislandguitars.com
www.soundcloud.com/davidravenmoon
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Using my cheap caliper I got these measurements in inches.
Width .9895
Height .5055
Length 3.6290
Inner Width .2870
Inner Length 2.7995
Wall thickness .035
and they have 70 714 PHI printed on the inside.
One of my favorite ebay sellers has a small stock of these they were used on the LPR and LPR bass pickups. PM me if you want there name.Last edited by JasonG; 12-04-2009, 09:20 PM.
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Les Paul Recording pickups - how low is "low-impedance"
I recently acquired a 1970's Les Paul Recording guitar with the low-impedance pickups and I want to take advantage of the low-impedance output without using the transformer that is built into the guitar.
There are several low-to-high impedance transformers that I can put at the amp end of my cable but I wondering how low the "low-impedance" output from the guitar is. For example, Shure has their A95U which can accept low-impedance input in the 75-300 ohm range or 19-75 ohm (if you re-solder a lead), while Electro-Voice has their E-V 502CP at 150 ohms. Radio Shack has one at 900 ohms (I think).
Reading this and other threads I see people say the Les Paul Recording pickups have values of 10 to 150 to several hundred ohms.
Which impedance matching transformer is most appropriate, and does it matter?
(Note that my electrical knowledge is from one physics class that I took in 1975 - about the same time that my guitar was being marketed by Gibson - AND my electrical knowledge has not been updated since, so it's pretty rusty!)
Thanks for your collective knowledge!
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Originally posted by clementc3 View PostI recently acquired a 1970's Les Paul Recording guitar with the low-impedance pickups and I want to take advantage of the low-impedance output without using the transformer that is built into the guitar.
There are several low-to-high impedance transformers that I can put at the amp end of my cable but I wondering how low the "low-impedance" output from the guitar is. For example, Shure has their A95U which can accept low-impedance input in the 75-300 ohm range or 19-75 ohm (if you re-solder a lead), while Electro-Voice has their E-V 502CP at 150 ohms. Radio Shack has one at 900 ohms (I think).
Reading this and other threads I see people say the Les Paul Recording pickups have values of 10 to 150 to several hundred ohms.
Which impedance matching transformer is most appropriate, and does it matter?
(Note that my electrical knowledge is from one physics class that I took in 1975 - about the same time that my guitar was being marketed by Gibson - AND my electrical knowledge has not been updated since, so it's pretty rusty!)
Thanks for your collective knowledge!
You can use the Shure A95U series wired at the 150 ohm (impedance range is for microphones rated between 75 and 300 ohms) setting located at the amp end of the guitar cable. This way the cable capacitance does not affect the sound. Alternately, you can use a powered microphone preamp like the ART MP which uses a 12ax7 tube in the front end. Feed the output of this preamp into the guitar amp input and adjust the guiter volume, preamp level and amp level for a clean sound first. As an alternative, the Guitar Center has an Audix T50K matching transformer that will also work for about $20.00. The T50K has a rated impedance of 600 ohms to 50K.
The discussions about the LPR pickup being rated as low as 10 ohms is the DC resistance of the pickup coil windings. You want the matching transformer load impedance to be about 5 to 10 times higher than the pickup source impedance to have the most optimum voltage transfer. Impedance is measured and specified at 1000Hz and is typically higher then the DC resistance depending on how much metal is in the core or is around/near the pickup coils. The matching transformer will boost the low impedance pickup voltage by about the same as it's turns ratio, typically about 10 times. Use the low impedance output if you want to hear the full effect of the decade selector switch.
Joseph Rogowski
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Joseph -
Thanks for clarifying DC resistance vs. transformer load impedance!
I'm going to get the Shure A95U transformer instead of going the powered preamp route. I am looking forward to hearing at least some effect from the Decade switch - it is pretty undetectable when I use the high impedance output setting on the LPR. The LPR does sound very clean already when I use the high impedance output but I get the impression from websites about the LPR that there is more to be explored if I use the low impedance output correctly.
Clement Chen
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Les Paul Guitar Users Forum
I have already seen, read and re-read the Les Paul Guitar Users Forum which is a terrific source of information - now I am trying to get the most out of the low-impedance pickups! I'm going to get the Shure A95U to see if my Decade switch does even the three basic modes described on that page. I am also interested in hearing how the tone is affected by using the low impedance output with the Shure transformer at the amp end, instead of the built-in transformer inside my LPR.
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The decade switch has an effect when the caps are good. I can't help but think that the tantum caps they put in those things have not aged well. If your guitar is not in collectable shape recap it with some poly's.
Having the transformer is the way to go, the next best thing is having some low capacitance cables.
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"poly" caps?
I am not up to speed on electronic components so I don't know what a "poly" cap is. (I don't know what "tantum" is either, although I would guess that it is a material inside certain capacitors). I do have a schematic which should show me the values, but what do I look for or request if I am shopping for "poly" caps? Sorry to be a newb!
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