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  Easily working with guitar circuits' tone

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Author Topic:   Easily working with guitar circuits' tone
Denny Turner
Member

From: Northshore Oahu, Hawaii USA

posted 22 March 2005 04:06 PM     profile     
Since there are now and often ongoing discussions about guitar circuits on the several SGF sections; Here's some info and ideas for folks who might need simple / basic ideas for experimenting with electric guitar componants and circuits.

A couple of folks in a BR9 message chain mentioned that their BR9 sounded bad. I think it important that before someone accounts a bad sound to a particular model at-large that they're not familiar with at-large, that they test all of the Guitar's componants to see if their values measure to the specifications they're supposed to. Another BR9 discussion chain has good information and resource links about guitar componants and wiring ...as well as a number of other SGF discussion chains.

A case in point is that I purchased a Fender Champ several months ago and did not like the harsh / glassy / low-sustain sound of the pickup even though it's output volume seemed within normal range; ...but other folks have had very good opinions of Champs' sound. So I will eventually open up that Champ and test all the componants as the most likely culprit of it's sound I don't like.

Another case in point is Roy Thomson's recent posting of 2 super-good sound files he played on a BR9 he had just recently acquired ...which demonstrates quite well that there ain't anything wrong with that particular BR9! BUT, ...which of the 2 pickups (or more?) in BR9 productions does Roy's have, ...and have any componants been changed out as is rather common, ...and is that sound a "standard" to expect from a factory-original BR9? No-one would know unless they opened it up to see and know the componants that made it's sound ...and what effects and EQ'ing Roy used. A matter of having at least a basic understanding of guitars' relatively simple electronics.

Point being that there are MANY factors that effect the sound that exits a guitar and is further effected by it's amplification / effects process. And even though the variables are quite complex, they're all quite simple and can be generally learned rather well in several months of casual research and studying, ...and the internet makes that quite easy to do, especially with the archives here on the SGF. Even the downstream resources links of this posting alone will go a LONG way in learning about guitar circuits.

I have seen a number of comments that equate "cheap guitars" with bad sound. I have not found that to be true in the vast majority of cases. An inexpensive-market Steel Guitar will obviously not have the same sound that a more costly high-tech Steel will; And pointedly, more costly high-tech Steels will usually not provide the sound characters that an inexpensive one will; Their sounds are simply different; Although either can be made to sound more like the other. Having a good mental familiarity with the mechanics of what makes an electric guitar's sound, will go a long way in knowing what sound characters to expect from a particular guitar and how a person might make it sound more like they desire within the capabilities of it's componants and amplification processing; ......particularly after researching the componants and Player reports for a particulr model ...and better-yet playing it, the longer the better.

Many years ago I purchased a cheap basic electronic projects kit from Radio Shack. It had a booklet with simple basic electronic theory. It also had a masonite pegboard about a foot square upon which small springs were bolted into each peg-hole to use to connect componants and wires to make a circuit (simply by putting a wire-end into a spring between it's pinching coils). I used that board to easily install, wire and experiment with guitar componants and circuits connected to the pickup in a guitar via a 3' long shielded signal cord with alligator clips on the ends. Componants could quickly and easily be changed out on the board for experimenting with pots and caps and wiring schemes. A board like that can be made very easily. Aslo very useful is a collection of 6 to 10 wires with alligator clips on the ends of each wire ...about 2 to 3' long and each wire a different color (although several additional red and black ones make it easier to visualize / mark hot and ground routes of a circuit; Easy to make or available at Radio Shack; Which can be used to wire up circuits and/or componants outside a guitar. Similar jumpers of short length are also quite handy.

Aloha,
DT~

[This message was edited by Denny Turner on 22 March 2005 at 04:14 PM.]

Bryan Bradfield
Member

From: Lethbridge, Alberta, Canada.

posted 22 March 2005 06:40 PM     profile     
It is refreshing to see a neutral position with respect to the tone that is emitted from various electric instruments. I perform with dobro (main instrument) and lap steel (secondary instrument). I like to put everything into one channel in the P.A. and then change from one instrument to the other with an A/B switching device. Because my typical audience (bluegrass) is particular about dobro tone, that is what I focus on during set-up. Then I plug in the lap steel and adjust its on-board volume to match the volume of the dobro, and that's it. I've found that there is not a preconceived bias with respect to the lap steel sound, while there is a definite bias concerning dobro tone. I believe that this is because there typically exists such a wide variation in tones from various electric instruments, that while people may have preferences concerning electric tone, there is not a violent outburst against the "wrong" tone, as would be in case if I dialed in a a weird dobro tone.

Or, on the other hand, because my audience is a bluegrass (acoustic) group of people, is it possible that they are simply not connoisseurs of "good" lap steel tone?

Jerry Erickson
Member

From: Atlanta,IL 61723

posted 23 March 2005 08:33 PM     profile     
You are so right about checking component values in a guitar Denny. I have an Epi Electar Zephyr D8 that didn't sound good when plugged into a vol pedal and amp. I measured the impedance of each pickup at the jack and my meter read 160K ohms. This was telling me that the pickups were open. I took one of the pickups out to send it off to be rewound and measured it and it read around 6K ohms. I replaced the pots and switch and the guitar sounds wonderful.
Denny Turner
Member

From: Northshore Oahu, Hawaii USA

posted 23 March 2005 10:49 PM     profile     
Yes Bryan; Personal rigs and covering for such things as multiple instruments is a most interesting matter.

I started another discussion topic "Personal Rig Setups; And Multiple Instruments"; ...so as not to get this discussion of guitar electronics "too far" afield.

Aloha,
DT~

[This message was edited by Denny Turner on 23 March 2005 at 10:53 PM.]

Denny Turner
Member

From: Northshore Oahu, Hawaii USA

posted 23 March 2005 11:06 PM     profile     
You bet Jerry.

Folks who wind pickups for a living / business usually have long lists of the impedence values of different pickups ...that they've either acquired or personally measured and archived. They are also usually expert in pots, caps and switching as well. Telephoning or emailing them is a good way to find out what the value of a certain pickup or componant should be. And if that's their bread-and-butter, it is nice to offer to send them a stipend for their valuable real-time, ...and you will have that resource happy for future inquiries; ...Although first posting the question on the SGF here often gets the results free and the provider usually happy to do so at their liesure (IMHO) demonstrated by their doing so.

Aloha,
DT~

Donny Hinson
Member

From: Balto., Md. U.S.A.

posted 26 March 2005 06:03 PM     profile     
Denny, there's a book out called "Projects for Guitarists", by Craig Anderton. It has a lot of different guitar-wiring circuits, and I think you'd enjoy it. It's available various places on the web, and from Antique Electronics Supply, too.
Denny Turner
Member

From: Northshore Oahu, Hawaii USA

posted 28 March 2005 07:09 AM     profile     
Hey ...Thanks a mil Donny. I don't have that one. Sounds interesting. I'll go look for it.

Aloha,
DT~

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