New Equipment

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Olympic Studio One Germanium Mic EQ module

This 500 series compatible modules is a copy of the Original Mic EQ unit used in Studio One Olympic Studios Barnes 1966, until 1978 it contains Germanium transistors and has a dynamic overload that you will not find in Helios desks which it pre dates by around four years.

The original circuits have been replicated using new old stock transistors, the pcb boards have been reduced in size to a to the API 2520 footprint.

The module has four plug in Class A discrete amplifiers , Mic Amp, Post Eq amp, and out put Amps, the mic amp is the three transistor design designed by Dick Swettenham developed at Olympic where he was technical director it can also be found in the early Helios desks it was known as the MMC1 card, ( Mic Mix Card ) the next module is a two transistor germanium post EQ amp , the output stage is a balanced class A discreet balanced configuration with amplifiers capable of driving into 600 ohm’s there were no output transformers used in the main output stages of the desk, the signal path would see Dolby 301/360 transformers , Ampex or 3M tape machines in the signal path depending on the recording year in question.

There were five mid frequency’s on the original desk 1.4kHz, 2 kHz ,2.8kHz. 3.5kHz,4.5Khz.

When the desk was replaced around 1978 with an in house design ( by Jim McBride ) three more frequencies were added 5.6kHz,8.2kHz ,10kHz theses have been include in the module.

The module also contains a Lustraphone M10 clone, which is part of the Olympic sound these transformers are now manufactured in house using a custom built winder and software, for more information on its development please see Lustraphone section .

Because we decided to take a modular approach and have plug in electronics to it is possible to replace the post EQ and output stages amplifiers with a different types this would make it sound similar to the 1978 desk replacement or the first Helios desk built in 1969 and installed in Studio 2 this was the first and only Helios Desk that Olympic ever had, these desks contain Silicon transistors and could be run at a higher voltage rail and therefore have more headroom.

These modules were never design to be used outside of the console they perform better in a mixer channel were a channel fader with gain is available like the original.
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Post EQ amp using new old stock Germanium transistors gain of 21dB post EQ gain makeup used at Olympic Studios 1966 rich in harmonic distortion running on a -24volt supply available in limited numbers for DIY projects.
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A useful Balanced output PCBcard using class A TopAmps wide supply range : ±5V to ±24V +26dBu Maximun Signal Handling with ultra low distortion use anywhere to convert unbalanced to balanced signals
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TopAmp with optional 2520 foot print (shown )
Discrete Class-A
AUDIO OPERATIONAL AMPLIFIER

FEATURES

* ULTIMATE SONIC CLARITY
* DISCRETE BIPOLAR CLASS-A DESIGN
* +26dBu MAXIMUM SIGNAL HANDLING
* ULTRA LOW DISTORTION: 0.0003%
* ULTRA LOW NOISE: 1.8nV/ Hz AT 40dB GAIN
* COMMON MODE REJECTION >80dB
* OPEN-LOOP GAIN: >70dB
* SLEW RATE: 8V/us
* FULL POWER BANDWIDTH: 2MHz
* WIDE SUPPLY RANGE: ±5V to ±24V

APPLICATIONS

* PROFESSIONAL AUDIO OEM
* MIXING CONSOLES
* SUMMING AMPLIFIERS
* PREAMPLIFIERS
* EQUALISERS
* COMPRESSORS
* ACTIVE FILTERS
* CROSSOVERS
* LINE DRIVERS
* LINE RECEIVERS

DESCRIPTION

The TopAmp is a specialist audio operational amplifier that uses pure class-A circuitry from input to output, designed to re-capture the clarity and character of classic audio recordings from the 1960’s and 1970’s.

Derived from a long-held understanding that where sonic fidelity is concerned, “less is more”, the TopAmp uses the absolute minimum of components necessary to achieve the performance expected from a modern op-amp in terms of noise, distortion and power supply rejection. Only five transistors are in the signal path.

Bipolar pnp devices are used for low noise yet the TopAmp still has an input impedance of over 50 meg A matched pair of input transistors provides good common-mode rejection, while medium-power output transistors combine effortless load driving with effective heat dissipation.

When operated at ±24V, input and output signals of +26dBu are accommodated. Even at maximum signal level, distortion is still only 0.04% and is mostly second harmonic.

The TopAmp has a 6-pin in-line connector with a 0.1” (2.54mm) pitch and mounts horizontally to suit applications with limited height, such as 1U rack enclosures, 500 Modules and mixer channels. It can be soldered directly into a PCB or mounted in a turned-pin SIL socket.
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Evalution Board for the TopAmp useing 2520 footprint.
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