I don’t really know why, but the great sound of Gretsch
pickups seems to have passed me by. I remember sitting and listening to the
electronics expert Ron Fairweather at the music shop where I worked in the
seventies. He had some big Gretsch semi acoustic and it sounded wonderful. But
then I went out and bought a Telecaster and the die was cast!
Well, till now that is. A customer asked me if I could come
up with a classic Gretsch FilterTron sort of sound, in a standard humbucker
package. Well could I?
The FilterTron sound comes from firstly it’s very low power,
for a humbucker at least. With a fifties Gibson PAF humbucker the DC resistance
was anywhere between 7k and 9k. With a fifties Filtertron the resistance barely
crept up to 5k … less than the majority of single coil pickups!
The FilterTron was a design cooperation between Ray
Butts and Chet Atkins, largely because Atkins didn’t like Gretsch’s single coil pickups at the time. In fact
Butts may well have been the inventor of the humbucker rather than Seth Lover
of Gibson … it’s just that Lover got to the patent office first! Anyhow, tiny, low
wound coils with a huge alnico 5 magnets give the FilterTron its trademark open
twangy growl.
My first step was to measure up a FilterTron and see how I
was going to fit the essentials of a tall narrow pickup into a case designed
for a PAF … a wide, squat one! The Gretsch pickup is around ¾ of an inch tall …
whereas a vintage nickel PAF cover is
only 7/8! One bit of good news was that though much narrower, the
Gretsch bobbins were around the same length as standard F spaced Gibson style
bobbin, and near enough the same height. This coupled with the fact that though
the Gretsch pickup was much narrower than the Gibson, the bobbins were no more
than 1.6mm closer together. This would mean that I could use standard Gibbo
style bobbins without cutting them down and not really change the sound to an appreciable
degree.
My next problem was the magnet. The fifties magnets were
huge tombstones ¼ of an inch thick … compared with the 1/8th inch
thick PAF magnets! Their power helped to compensate for the coils low output …
and the alnico 5 helped to add snap and bite. Recent re-issues have used
ceramic magnets, but I’m not a fan of the grainy top you can get with that, so
I devised a special ‘Siamese’ magnet assembly that utilises two alnico 5
magnets to take the place of the one in the original. These pickups will (shortly)
go into full production … so I have persuaded my magnet suppliers to make
vintage sized magnet for future editions of this pickup!
With two low output bobbins wound (both screw coils like the
original Gretsch) and a magnet assembly sorted I then found I didn’t have long
enough baseplate screws to hold it all together! Oh well, masking tape, double
sided tape and cardboard packing got a rough prototype sitting in the guts of
the ‘pink terror’ Strat.
Here are a couple of rough and ready MP3s to show what we have (direct into Reaper with just a little slap back echo on the second one
MP3
MP3 2
Result! The sound was pretty close to what I’d expected: bright, woody with brilliant string definition and an almost single coil character. Twangy and thinner than a conventional humbucker it has lots of attack and a particular ‘stringy’ quality that with overdrive (my trusty TS808 clone) turned into quite a roar.
MP3 2
Result! The sound was pretty close to what I’d expected: bright, woody with brilliant string definition and an almost single coil character. Twangy and thinner than a conventional humbucker it has lots of attack and a particular ‘stringy’ quality that with overdrive (my trusty TS808 clone) turned into quite a roar.
What’s to do now? Well the pole pieces need changed for some
nice nickel plated ones instead of the trashy gold plated ones I have in there
as place holders. Some longer screws
need to be sourced to hold the whole shooting match together … oh and some
chunky maple spacers will need to be made, pretty much double the size of normal
humbucker ones.
I’ve trial fitted a nickel cover and luckily the ‘lip’ of
the baseplate gives just enough height for a cover to be fitted … phew! Not
sure if the pickup will be potted that’ll be up to the customer, but unspotted this
pickup has a lovely delicate tone … it almost seems a shame …
Oh I should point out that my products are in no way associated with Gretsch or the FilterTron trademarks.
Stay tuned for part two!
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