- Item: Portable headphone amp
- Type: retro-thermionic - "retro-K465"
- Posted: 17 September 2020
- Builder: mwhouston
- Country: Australia
- Comments: 0
retro-K465
A larger ABS enclosure was used than the last two HP amps to accommodate the cct. brd and two 9V lithium batteries. The batteries are converted to differential supply on board - +/- 9V. The enclosure is lined with Al foil top and bottom and is earthed.
Once more my "safe on" wiring using the changeover switch on the input socket ensures the amp cannot accidentally be left on and drain batteries. The sound is good with excellent clarity, good volume and drive. The kit should be simple to assemble. The kit is complete with 9V battery clips and the ability to also use AA battery holders. You can see I am now spoiled for choice with three HP amps, one with the PT2308 chip and the others with OPA2134 chip.
