E-Mu Ring Mod

No title link. Just the two shots and details pulled via this auction.

Details:
"Up for bid, a 2430 Ring Modulator vintage analog synthesizer module by E-mu. PCBs are date coded 1974. Info on the E-mu modular can be found at emulatorarchive.com - also the following info is copied from the official E-mu literature from the 1970's:

The Eµ 2430 Ring Modulator is a balanced modulator for electronic music. It contains an Eµ 1430 ring modulator submodule. The module has two inputs, modulation and carrier, which are identical for high signal levels. The output is the algebraic product of the input voltages:

Vout = Vmod x Vcar ÷ 5

when the input attenuators are fully clockwise and the coupling switches are in the DC position. AC coupling will level-shift the corresponding input so it effectively centers around zero volts. This can have a striking effect on the output signal, due to the inherent non-linearity of balanced modulation. The Eµ 2430 was designed for high carrier rejection in the absence of a modulation signal, typically in excess of 80dB. The reverse rejection, that of modulation feedthrough with no carrier, is only 40dB.
Power Requirements: ±15 V @ 10 mA typical
Firm-wire Patch Connections:
Inputs - Modulation, Carrier
Outputs One (3 pins)
Power Bus Connected Inputs: None
Adjustments: Gain
Modulation Rej'n - Mod positive
Modulation Rej'n - Mod negative"


Update: Not directly synth related, but you might want to check out the seller's "KORG Univox EC-100 Stage Tape Echo Delay by Unicord" as well. That was a mouth full. linky

Roland Juno 106

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Alesis ION Filters and Oscillators

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Alesis Ion - oscillators shaping

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Alesis Ion - organ sounds

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Fletch Theme - Alesis Ion and Juno 106

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Amdek Drum Synth

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Oberheim OB-Xa

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MOOG Minimoog

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KORG Polysix

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DC-13 Dual Bus Converter

Title link takes you to shots pulled via this auction.

Some Details:
"Combines Roland BC-13 and US-20 Technology in One Compact Enclosure
Works with Roland G-202, 303, 505, 707, 808, Ibanez IMG2010 and Roland GI-10, GI-20, GR-1, GR-9, GR-30, GR-33, VG-88 and More!

For about ten years, Roland Corporation and other manufacturers produced a range of unique, very high quality 24-pin guitar synthesizer controllers. With the advent of the contemporary Roland 13-pin standard, vintage guitar synth owners could only access the latest in guitar synthesizer technologies with the incredibly rare, hard-to-find Roland BC-13 Bus Converter.

The DC-13 V2 expands on the features of the BC-13 by adding Roland US-20 style switching features so that not only one, but two synthesizers can be played at the same time. The DC-13 V2 also has features not found on the US-20, like the ability to independently control the volume levels of each guitar synthesizer.

In addition to the footswitch controls on the DC-13 V2, there is completely independent control over both synthesizers’ volume. The DC-13 V2 does this by using the Filter knob (or CV#1) on a vintage GR-Controller to control the volume of guitar synthesizer A, and by using the Resonance knob (or CV#2) on a vintage GR-Controller to control the volume of guitar synthesizer B. The Master Volume knob is still used to control the volume of the normal guitar output from the 1/4” jack on the guitar .

The DC-13 V2 expands on the original Roland BC-13 by adding a standard Roland EV-5 input jack to control the volume of the direct guitar sound. This gives the player three ways to control the volume of the direct guitar sound: by using a Roland EV-5 pedal to control the volume, or by running a 1/4” cable directly from the guitar to the DC-13 V2 guitar input and using the master volume control on the guitar, or by using the guitar output feature on the attached guitar synthesizer module.

Inputs and Outputs
Like a Roland BC-13, the DC-13 V2 has a 24-pin Guitar Synth and 1/4” Guitar input jack, and a 13-pin Guitar Synth output connector. With only the 24-pin cable plugged in, the level of the direct (humbucker) guitar sound can be controlled by an optional pedal. If you want to vary the level of the direct (humbucker) sound using the volume knob on the guitar, then a second cable is connected from the 1/4” Guitar output jack on the Guitar Controller to the 1/4” Guitar input jack on the DC-13 V2. This is the same design used by the Roland BC-13.

Features of the DC-13 V2:
* Use One Vintage Roland 24-Pin Guitar Controller to play Two 13-Pin Modern Guitar Synthesizers
* Independent Volume Control Over Each Synthesizer
* Powered by 13-Pin Guitar Cable! No External Power Supply or Batteries Required
* Rugged Stomp-Box Enclosure Design
* Backed by One-Year Parts and Labor Warranty
* Elegant Design