what is this "speed" knob on my ashly sc-68?

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shmuu102

Guest
ok, i purchaced a couple of eq's on ebay. one was an ashly sc-66a, which i like. ( if anyone knows anything about the balanced xlr mods to this unit please drop me a line). the other, getting to the point, was a 7 band notch filter ( model sc-68). it seems like a straight forward cut-only eq, except one knob that is labled "speed" (slow to fast of course). two other sets of switches labled setup and operation are almost as baffling.
i would have plugged it in to play with it, but it is in need of a new power cord. any insight would be helpfull ( and possibly entertaining) thanks.
 
Kurt Foster

Kurt Foster

Well-Known Member
Joined
Jul 2, 2002
Location
77 Sunset Lane.
It sounds like this is dynamic filter. Which means it is a filter that kicks in as a certian threshold is reached. It's sort of a compressor that works on a specific frequency. Kurt
 
R

Roly

Guest
Perhaps the "setup" switch is for listening to the filters only as in what's been cut and "operate" switch is everything minus filters. That's how my BSS DPR 901 works.
Roly
 
R

realdynamix

Well-Known Member
Joined
Feb 23, 2001
Originally posted by shmuu102:
...a 7 band notch filter ( model sc-68). it seems like a straight forward cut-only eq, except one knob that is labled "speed" (slow to fast of course). two other sets of switches labled setup and operation are almost as baffling.
Click to expand...
:) Tag!

SC-68
Parametric Notch Filter
circa 1982

The SC-68 Parametric Notch Filter is a cut-only equalizer which is used to insert
relatively sharp dips in the frequency spectrum. As such, it is useful for removing
spot frequencies which cause problems such as feedback, cabinet resonances, hum or
TV sync signals, and single "hot" notes on musical instruments.

Specifications:
Amplitude: 0 to -30dB
Frequency: (low) 16Hz - 800Hz
(3/low-mid) 48Hz - 2.4KHz
(3/hi-mid) 160Hz - 8KHz
(high) 480Hz - 24KHz
Bandwidth: 0.3 octave - 0.03 octave
Input Z: 10K ohm active balanced bridging
Max Input-Output Level: +20dB (+5dB at max cut, full sharp)
Frequency Response: +/-0.5dB, 20 - 20KHz
Output Z: 50 ohm, term with 600 ohm or more
Hum and Noise: -87dBV (eq in), -95dB (eq out)
THD: <0.05%, +10dBV, 20 - 20KHz
Power: 120VAC, 50 - 60HZ, 5W
Shipping Weight: 12 lbs.

:) I bet the thing fades in and out of operation at speed set by the control. There is an insertion loss involved here too, of about 8 to 10db.

Love this old gear,

--Rick
 
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