Cheap 😉 Avalon VT-737SP Tube Channel Strip ✔️

The Avalon VT-737SP is a channel strip featuring a combination of tube pre-amplifiers, opto compressor, sweep equalizer, output level and VU metering in a 2U space.

PREAMPLIFIER

The VT-737SP has three input selections:

1. The VT-737SP features a higher-performance microphone input transformer with +48V phantom selection
2. Instrument DI high source input with jack located on front panel
3. Balanced line input, discrete high-level Class A

The Class A preamplifier utilizes two cascaded, dual vacuum tube triodes configured with minimum negative feedback.  A high gain switch boosts the overall gain of the preamplifier.  The four high quality tubes are configured as singled ended anode coupled followers.  A passive-variable high pass filter and hard-wire relay bypass completes the input signal conditioning. The phase reverse relay is available on all three inputs.

OPTO COMPRESSOR

The opto compressor features a minimum signal path design with twin Class A vacuum tube triodes for gain matching.  The optical attenuator acts as a simple passive level controller.  Full dynamic control from soft compression to hard- knee limiting can be achieved with threshold, ratio-compression, attack and release controls plus gain reduction selection on the large VU meter. Special spectral control including de-ess is available with the dual sweep mid EQ to side-chain switch. The EQ section can be flipped pre or post the opto compressor via a front panel switch for alternate effects and tone shaping.  Two VT-737SPs can be linked via a rear panel link cable for stereo tracking. The compressor bypass is a sealed silver relay for the most direct signal path.

SWEEP-EQUALIZER AND OUTPUT LEVEL

FEATURES:

• Vacuum tube triode signal path
• Transformer balanced microphone input
• High-voltage circuits for maximum headroom to +30 dB
• Low noise -92 dB
• Internal discrete power supply with toroidal transformer
• Soft-start tube life extender
• Stereo link for compressors
• All discrete Class A equalizer with musical passive filter design
• Sealed silver relays for signal routing
• Large control knobs with professional conductive plastic potentiometers
• VU meter for output level monitoring and compressor gain reduction