|
 Vacuum tube products, once the domain of vintage
equipment collectors and restorers (like moi), are
increasingly becoming part of the mainstream retro electronics movement. Usually
the tube portion of a circuit is limited to the output amplifier or maybe a preamplifier
in an audio frequency application, where amplitude stability is not a major performance
factor. RF tuning and detector circuits use, thankfully, modern microelectronic
components in order to benefit from precision digital tuning and even computer interfaces.
Audiophiles have long held that the microphonic action of physical elements within
the vacuum tube adds a warm quality to sound that cannot be replicated with solid
state devices.
Raspberry Pi 3 Complete Starter Kit - 32 GB Edition
This
503HTA Hybrid Tube Amplifier is yet another highly successful Kickstarter project
that is built around the Raspberry Pi single board computer (SBC).
The project has far exceeded its support goal of $20,000 with $78,744 already pledged
and 25 days still to go. Per the website:
"Pi 2 Design is excited
to introduce the first Tube Amp specifically designed for any of the 40-pin versions
of the Raspberry Pi SBC Family. The 503HTA Hybrid Tube Amp HAT, designed and manufactured
by Pi2Media (a division of PI 2 Design), is a High
Quality I/O Shield designed to bring 'Sweet Tube Sound' to the Raspberry PI ® family
of Single Board Computers. This HAT allows the Raspberry Pi ® SBC to drive Headphones
from 32 - 300 ohm with ease and fidelity.
Featured Product Archive
The inventions and products featured on these pages were chosen either for their
uniqueness in the RF engineering realm, or are simply awesome (or ridiculous) enough
to warrant an appearance.
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Based on the popular Bravo V2 design with all recommended Mods, the On-Board PCM5102A
DAC drives the single stage
12AU7 (or 6922) tube. The Class-A Output Stage
is comprised of the IRL510 and LM317A. The dedicated heater supply insures zero
crosstalk."
There is now a $100K "Stretch Goal # 2" to upgrade capacitors, the power switch,
and a volume control option.
Posted on May 12, 2016
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