Buzzaudio Elexir

 

The elixir preamplifier module is an excellent compliment to the "fatter" sound of many modules now available in the API* 500VPR Series format and has been designed to provide exceptionally low noise wide bandwidth amplification of microphone and instrument signals. The elixir will suit those who desire a recording preamplifier where just a slight amount of bass colour is added to the original signal whilst retaining full treble extension and a smooth midrange - warm, sweet, liquid - the perfect blend.

 

elixirdescription

 

The elixir circuit design uses two BE40 True Class A amplifiers in a transformeless input arrangement followed by two newly designed BE50 True Class A high current audio buffers that drive a Lundahl* LL1517 output transformer. The topology is balanced throughout with the transformer providing the balanced to balanced output conversion and common mode rejection. This set up is quite different to most single amplifier 500 series preamps and ensures excellent transient response, extended bandwidth and very good induced noise rejection.

 

As with all our mic preamplifier designs, we like to think of them as an extension to the connected microphone - not a separate entity.

 

Looking at the distortion specifications, the presence of the Lundahl* output transformer adds a subtle amount of harmonic at low frequencies thereby enhancing the bottom end but without sacrificing the wide bandwith needed for good clarity and transient response in the top end.

 

The output configuration of the elixir results in a maximum output level of +34dBu before clipping, which means it can comfortably deliver clean audio into all analogue or digital recorders without overload.

 

Gain range of the microphone input is 22dB to 70dB or -2dB to 50dB with the -20dB pad selected. More than enough for ribbon microphones. The input impedance (selected with the IN Z switch) is 4000 ohms in the H position or 1200 ohms in the L position.

 

The instrument input on the elixir features a "bootstrapped FET" high to low impedance convertor that then feeds the elixir amplifier stages. Selection of the instrument input is automatic when a jack is inserted on the front panel input.

 

Gain range of the instrument input is 10db less than the mic input at 12dB to 60dB. The input impedance is switchable 1,000,000 ohms or 20,000 ohms with the IN Z switch.

 

Rack Compatibility

The elixir power consumption is higher than most other 500 series modules and this may stress some rack power supplies depending on what other modules are fitted. Please check the following list to see if it will work OK in your rack.

 

API Lunchbox 6B - recommend only two elixir modules are fitted along with other modules.

API 500VPR with L200PS - no problems.

Atlas Pro Audio Revolver - no problems.

OSA Power Rack & Track Pack - no problems if you have the 3 amp external power supply.

B.A.E. 6 & 11 Slot Racks - not tested, check with B.A.E. for power capacity.

Purple Audio Sweet 10 - recommend up to 6 elixirs in this rack along with other modules. Mount elixirs at the left side of the rack to avoid power supply noise.

Radial Engineering racks - not tested, but reported to be OK with up to 6 elixirs in rack.

A Designs 500HR - not recommended due to power supply noise issues.

 

features

 

API* 500VPR Series rack module format - plug in and play!

Advanced analogue technology - not a clone or copy of products from the past.

Fully discrete hi-bias wide bandwidth differential Class A amplifiers.

Matched and selected semiconductors.

Transformerless input, straightline single path.

High performance Lundahl* output transformer.

41 position max trimmed GAIN control.

Optimized "grunty" Class A amplifiers for the input/output functions.

Output Mute and Hi/Lo input impedance switches.

Accurate four LED peak level meter.

 

specifications

 

Min Gain Mic = +22dB (-2dB with pad in)

Max Gain Mic = +70dB

Min Gain Instrument = +12dB (-3dB with pad in)

Max Gain Instrument = +60dB

Maximum Output Level = +34dBu into 3k ohm load.

Frequency Response Mic = 10Hz to 300kHz @ 20dB gain (-3dB).

Frequency Response Instrument = 10Hz to 120kHz @ 20dB gain (-3dB).

Slew Rate = 30V/uS @ +20dBu output level

Harmonic Distortion measured at -20dBu input level, gain adjusted for +10dBu output level

Mic = 0.15% @ 100Hz, 0.01% @ 1kHz, 0.005% @ 10kHz

Instrument = 0.15% @ 100Hz, 0.015% @ 1kHz, 0.015% @10kHz

EIN Mic = -132.5dB A wtg, 150ohm source Z.

Signal to Noise Ratio Mic = -73dB A wtg, input shorted.

Signal to Noise Ratio Instrument = -76dB A wtg, input shorted.

CMNR Mic = -78dB @ 100Hz, -100dB @ 1kHz, -100dB @ 10kHz.

Input Impedance Mic = 4k ohms/1k2 ohms switchable.

Input Impedance Instrument = 1MEG ohms/20k ohms switchable.

Controls = Gain, Mute, Phase Reverse, 20dB input Pad, Input impedance, Phantom pwr.

Indicators = 4 LED peak reading meter.

Size = (37Wx132H). Fits 1 space in API(TM) 500 series rack format

Power requirements = 150mA +/- 15-18 volts DC, as supplied by frame power supply.