The Clarity and Sparkle Show
3 July 2007
Last time I blogged, I noted that my guitar sounded strangely muffled compared to the stock Telecaster with which I tested my modded EVJ (Epiphone Valve Junior) combo. At the time, I put it down to the fact that Telecasters are often wired with a 'bleed' capacitor, which leaks treble frequencies when the guitar volume is turned down in order to keep that Telecaster edge.
But when Alnicomagnet (for it was he) pointed out that his Telecaster was so 'stock' that it didn't even include a bleed capacitor, I decided that it was time to INVESTIGATE.
As previously described, I had replaced my Kent Armstrong pickups with GFS pickups. Would it make any difference?
This is a simple exercise: record several different guitars, compare them and broadcast the results.
"Cue music. FX. Whisky for the Director! Action..."
As if anything was that simple
I'm writing these Progress updates using a "web log" tool called Wordpress, which automatically generates an RSS feed (don't ask). Every time I post an update on the progress section of the site, Wordpress automagically generates an RSS version of the story. Using the right software, you can 'subscribe' to this RSS feed and you'll get notified every time there's a new story. Now, a 'Podcast' is really just the combination of an RSS feed with an attached audio file. You subscribe to the blog, and every time an audio file is attached to an RSS feed, your podcast software checks it, downloads it and slaps it on your iPod.
So, if I attempt to demonstrate the nature of modern electric guitar wiring by attaching an audio file to this post, I am by default, podcasting.
Which means that I really ought to include some sort of explanation on the audio file explaining what I'm doing, or the poor bugger who has subscribed to the James Bisset Fiftieth Anniversary Edition Podcasts, will download and be baffled by something that sounds suspiciously like me tuning up several guitars.
Clarity and Sparkle
OK - back to the purpose of this post. I'd spent altogether too much time and stress (did I say that I've stopped smoking again?) rewiring my custom built strat with 'vintage' style pickups to try and clean up the sound, which was muddy when the guitar volume was turned down low. How do the new pickups compare with my other guitars?
So I've recorded four different guitars playing through the EVJ amp. I've included all four recordings on one podcast. And I've even made the podcast self-explanatory for anyone who downloads the podcasts and doesn't bother with the blog.
And for those of you in too much of a hurry even to listen to the podcasts: the muddiness is apparent using the Kent Armstrong pickups AND the GFS pickups. Conclusion: there's nothing wrong with the pickups, but there's something freaky about the star-grounding wiring technique.
Clarity and Sparkle Show
Comments
Stefan Pich
2007.07.03 15:48
#1
never mind doing silly guitar tests... do more podcasts like this... you may become an internet star!!
James
2007.11.21 23:48
#2
Thanks for the input Nikola.
See this post: Guitar tone episode 83 where I attempt to compare the differences between my custom wiring and the Fender Strat stock wiring.
I have since rewired the guitar with the same components, but using the Fender stock schematic and the difference is striking.
My guess is that my custom wiring blocks the treble frequencies at low volume or allows them to leak out somewhere, but I just haven't had the time recently to analyse the situation properly.
Any suggestions would be appreciated. :)
Nikola Tesla
2007.11.21 19:19
#3
Guitar wiring isn't a subjective thing just physics. Star grounding is used to avoid earth loops. I've yet to hear any reduction in noise, which is what it is meant to do, but a link to ground is just a link to ground. It will never affect the frequency range of a guitar unless it isn't actually going to ground. The "bleed" capacitor is used to retain treble frequencies at lower volumes due to the woeful inadequacies of passive electronics in guitars. So it lets treble frequencies past, it doesn't cut them. Telecasters used to have a "boom" capacitor to allow more bass frequencies through at a time when electric basses were few and far between which may be the cause of confusion.
What you need to look at is the set of potentiometers and the tone capacitor in the guitar. Cheap guitars have 500k pots and an .033uf capacitor to give a brighter sound but interact badly when you turn the tone/volume down. 250k pots and a .022uf capacitor make things better and are fitted as standard on real Strats but the "bleed" capacitor is still a good idea to retain top frequencies. I don't know why a couple of solder joints and a few pence worth of electronics are beyond Fender when they charge £600+ but there you go.
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