The Teletronix La-2a is one of the most revered compressors of all time. Its musical perfection has be found in studios all over the world since the 1960s and it is still made today by Universal Audio. This unit is an early "Grayface" version from when they were built in South Pasadena in the early 1960s using the highly desirable UTC HA-100X transformer. Last serviced by Fredo of Pinebox Pro Audio. We can see from the tag on the rear it was previously serviced by Retro Instruments Inc. Serial No. #425.

Revision 1

The Original Version, a.k.a. "Grayface"

Serial Numbers 001-572 (approx.)

1962-1965

• Note: First revision of LA-2 limiting amplifier, thus "LA-2A"
• Faceplate: Painted battleship gray, with red "Teletronix Engineering Co." logo
• Company Nameplate: A metal plate on the rear panel; says "Produced by Teletronix in Pasadena, CA (sometimes labeled Los Angeles, somemes labeled Sunnyvale)
• Type / Serial No. Plate: On the rear panel; a metal plate with engraved numbers
• Rear Panel Graphics: Hand stenciled or ink stamped
• Octal Jumper Socket: Located before the input transformer for pad/pre-emphasis modules
• Input Transformer: UTC HA-100X
• Electro-Optical attenuator cell: T4A
• Variable Pre-emphasis Filter,
  R37:Installed on later units (after #361 minimum)
• 230 volt operation: None
• Slightly smaller VU meter than all later versions.