HA-5 Headphone Amp, Play Bus

HA-5 Headphone Amp, Play Bus

This small amp has a rather ambigous name. Is it Headphone Amp or is it Play Bus? Well, it's both. It was on the market from 1983-1988 (unconfirmed). The HA-5 is the same size and shape as a Sony Walkman (R) which happened to be the most popular portable music player at the time. It doesn't have a speaker but instead you play through the optional RH-11M stereo headphones.

The HA-5 has built-in overdrive, stereo chorus and stereo short delay functions. There is a microphone jack with a separate volume control. This makes the RH-11M headphones ideal as it has a muilt-in microphone. The Play Bus part of the HA-5 comes from the ability to connect several HA-5 units together. Using a Multiple Jack J-5 as many as 4 people can jam together over the play bus.

HA-5 Specifications
  • Power: 9V DC (UM-3 x 6), PSA AC Adaptor

  • Input Impedance: Input 470kOhm, Mic 2.2kOhm, Cassette (Line in) 47kOhm, Phones 8Ohm-300Ohm

  • Play Bus input impedance: 10kOhm

  • Dimensions: 90mm (W) x 120mm (H) x 42mm (D) (3.5" x 4.7" x 1.7")

  • Weight: 350g (0.77 lbs.)


    • RH-11M Specifications
  • Type: Dynamic Open Air Speaker, Dynamic 12µ polyester film

  • Impedance: 50Ohm

  • Sensitivity:101dB/mW

  • Power Handling Capacity: 100mW (one unit)

  • Frequency Response: 18Hz-22kHz

  • Microphone: Dynamic, differential, bi-directional

  • Frequency Response: 50Hz-20kHz

  • Impednace: 160Ohm

  • Weight:2.4oz without cord, 3.2oz with cord and 2 plugs

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