Unique Raspberry Pi Hybrid Tube Amplifier Add On - Raspberry Pi Forums

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the 502hta complete redesign of highly popular 503hta. have increased size standard shield size , reduced noise floor. have added ability power pi it's own supply eliminate noise coupling pi. main features are:

  • form factor – raspberry pi ® shield w/40-pin connector
  • 24-bit dac – regarded -112db snr pcm5102 used convert i2s stream drive single
    triode tube stage @ 24-bit 192khz frame rate
  • tube rolling – 502hta supports both 6dj8 (default jj 6dj8) , 12au7 type tubes. individual
    anode bias adjustment pots plus selectable series/parallel heater configuration insure perfect setup for
    virtually tube!
  • headphone out – rugged 3.5mm jack plus selectable output resistance between 1.5, 47 , 100 ohms.
  • volume pot , gain select – high quality alps potentiometer , dual gain settings allow user
    adjust output voltage optimal level each headphone.
  • single power input option – single 24v @ 2a input powers 502hta , delivers 5v@3a pi
    via low pass noise filter. power can isolated between 502hta , raspberry pi lowest
    possible noise.
  • stand-alone option – 502hta can operated in stand-alone mode using 3.5mm line in
    jack. dedicated stand-alone version, ceres, available.
  • beautiful, clear acrylic case solid machined aluminum knob included
running kickstarter campaign significant discounts both 502hta , ceres. see here:

https://www.kickstarter.com/projects/18 ... d-tube-amp


502hta shown pi , case
image


ceres shown case
image



full disclosure - designer of 502hta , ceres , work @ pi 2 design



raspberrypi



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