Further developments and variants

Several other designs have sprung from the original Whamodyne development.

S.E.X. speakers

The first variant was created from cardboard and tape by Doc and Paul Joppa at a VALVE Christmas party. It was a dirt simple 'full range' open baffle speaker which later came to be suggested as an inexpensive companion to the original S.E.X. amp kit. Known as the S.E.X. speaker, it was simply two of the 5" aluminum cone drivers mounted on an open baffle and wired in series to give the S.E.X. amps a favorable 16 ohm load.  The most sophisticated variant we saw of this concept was built by Ray Kuehlthau of Indiana, shown at right. Small strips of plastic tape have been applied to the cone to help smooth some treble peaks.
Response of the open baffle setup is surprising 115 or so Hz to about 10 kHz. While the frequency extremes are naturally soft, the imaging and vocal presentation from this arrangement are quite striking.
Here's a compilation of articles

69

An attempt to refine the TQWT concept, the 69 consisted of two 8" aluminum cone drivers (PN 55-1295) and the Whamo tweeter in a 69" tall, 12" wide 3/4" MDF tapered pipe with a depth of 20" at the base. Very punchy, a really fun, lively sound, great with Afterglow. The woofers were wired in parallel for 4 ohms, and the pipe was stuffed with fiberfill. The design only gets down to about 65 Hz, but with a subwoofer it could be superb, offering a bit better imaging than the Whamos because of the fewer drivers in the array. This project was set aside, but some work near the end suggested a crossover on the woofers composed of (I think, it's been a while!) a .36mH choke and 2 mfd cap, and a 2 mfd cap on the tweeter as a good starting point to tame peaks in the 6 and 8 kHz range. Next Page