Ace Electronics only released a handful of tape delays while they were active, and the EC-10 and the EC-20 are the two most common ones. The EC-10 can be found in Ace Tone's 1972 catalog, but not the EC-20, which implies that it was probably released a bit later, in the mid-seventies, a few years before Ace Tone folded.
The EC-20 is the smaller of the two, but is very interesting in its own right, and is still packed with features. The EC-20, just like the EC-10, uses a short tension loop, but while the latter uses a standard "pinch roller/capstan" combination to drive the tape, the former doesn't have a capstan, the pinch roller being connected directly to the motor. It has four playback heads, a great amound of inputs and outputs, variable speed and a limited tone control in the form of a treble on/off switch. In doesn't have a VU meter, but an overload indicator light is on the front panel, allowing some visual feedback on input signal strength. There's also an input voltage selector at the back, which makes the unit perfectly suitable for any part of the globe.
The EC-20's unusual, capstan-less transport. Click to enlarge
The amount of tension on the tape can be varied by adjusting the tension roller from inside the unit; I had to adjust this to maximum tension on my unit in order to get steady echoes. This adjustment is closely related to the length of the tape loop, so it might need to be readjusted if you splice your own tape loop and the length isn't exactly the same as the previous loop.:
The tension spring, in 'low-tension' position before I adjusted it to the left-most notch
When I first turned on my EC-20 and played a few guitar chords through it, it output the most incredible, totally wild wobble I'd ever heard, like the machine was hopelessly drunk and was struggling to stay afoot... It was pretty interesting! I was curious to know what was happening, so I opened up the unit, and found the cause of the tape's wild behavior: an elastic band instead of a drive belt!
The elastic band I found in the unit, and the replacement I got for it. The rubber belt
is longer in order to compensate for the elastic's stretch.
It's the second time I've found an elastic band in a tape delay, which was probably put there in the vain hope to replace a broken drive belt (by the way, if you ever need a drive belt for a tape delay, look up 'turntable belts' on Google and you're on your way). Elastics do work, actually, because they have lots of grip and can really turn that flywheel... but they do so by constantly stretching and contracting, which give the 'drunk' effect. I've replaced the elastic band on my EC-20 with a proper rubber drive belt, but I kept the elastic, because I really liked the effect, it messes up the signal in a really organic way I can definitely use for sound morphing...
The other issue I had with the EC-20 was a very, very dirty tape path. When I removed the old tape loop, it was actually stuck to the heads, and the pinch roller was in a sorry state. I cleaned the heads with head cleaner a cotton swabs (with dense, hard cotton, not the 'Q-tips" fluffy type), and the pinch roller with 'rubber renue', a product from MG chemicals (hard to find outside North America, but I'm sure there are other similar products available), and that improved tape steadiness some more.
Before and after...
Once I had done a good cleaning of the tape path, replaced the drive belt and adjusted the tension roller, I had no further issues with the EC-20. It works fine now and it sounds great!
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