[NJARC] Tube amp for smartphones

Tue May 3 12:15:24 EDT 2016

Sounds promising. . .
http://www.thetubestore.com/Parts-Accessories/Amps-and-Amp-Kits/Hybrid-Valve-Headphone-Amp
.

Alex
~~~
Alexander B. Magoun, Ph.D., Outreach Historian
IEEE History Center
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USA

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