The LA2A Compressor is a tube levelling amplifier with an optical gain control unit.
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This optical gain control unit was built in a salvaged relay enclosure that plugs into a octal socket. The illumination is a EL panel, like the originals, with light dependent resistors (LDR) to attenuate the signal. The LDR simply operates in a vol
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This build uses Jensen line level (1:1) input transformers, to operate as a line level device, instead of the 10:1 transformers found in the originals.
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The circuit board is from [silent-arts] (on groupdiy). The output transformers are EDCOR WSM 15k:600
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RCA 6AQ5 power tubes drive the EL panel.
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This beautiful front panel came from don-audio. I put a switch for a sidechain HPF on the front panel, with a frequency select knob on the back panel.
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The LA2A Compressor is a tube levelling amplifier with an optical gain control unit.
? ? ? ?
? ? ?
+

The LA2A Compressor is a tube levelling amplifier with an optical gain control unit.

This optical gain control unit was built in a salvaged relay enclosure that plugs into a octal socket. The illumination is a EL panel, like the originals, with light dependent resistors (LDR) to attenuate the signal. The LDR simply operates in a vol
? ? ? ?
? ? ?
+

This optical gain control unit was built in a salvaged relay enclosure that plugs into a octal socket. The illumination is a EL panel, like the originals, with light dependent resistors (LDR) to attenuate the signal. The LDR simply operates in a voltage divider, followed by make-up gain.

This build uses Jensen line level (1:1) input transformers, to operate as a line level device, instead of the 10:1 transformers found in the originals.
? ? ? ?
? ? ?
+

This build uses Jensen line level (1:1) input transformers, to operate as a line level device, instead of the 10:1 transformers found in the originals.

The circuit board is from [silent-arts] (on groupdiy). The output transformers are EDCOR WSM 15k:600
? ? ? ?
? ? ?
+

The circuit board is from [silent-arts] (on groupdiy). The output transformers are EDCOR WSM 15k:600

RCA 6AQ5 power tubes drive the EL panel.
? ? ? ?
? ? ?
+

RCA 6AQ5 power tubes drive the EL panel.

This beautiful front panel came from don-audio. I put a switch for a sidechain HPF on the front panel, with a frequency select knob on the back panel.
? ? ? ?
? ? ?
+

This beautiful front panel came from don-audio. I put a switch for a sidechain HPF on the front panel, with a frequency select knob on the back panel.