Author Topic: 4SALE- Response Audio/Purity Audio Custom 300B Vacuum Tube Buffer/Preamp  (Read 584 times)

Offline Response Audio

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What you are looking at is a scalled down, non production version of the Purity Audio Design Harmonia 300B vacuum tube source buffer but with the addition of a 4 input relay based source selector and volume control. By scaled down, this means it is a single ended unit only and built into one of our remaining Musica bella Spitit linestage chassis. This is not a prototype.
We are considering bringing this model to market this summer after having chassis' designed.

The Harmonia BP is designed as a 300B buffer output stage for any source component. Can also be used as a preamp to be used into a power amplifier but may cause noise in higher effeciency speakers. See details below.

DETAILS: Price does NOT include 300B tubes or power cord. Shipping included to lower 48.
2 years parts and labor warranty

1 300B per channel
Solid state power supply with high current toroidal transformer.
Power supply is choke filtered
Plate choke on each 300B tubes
Pete Millett regulators for each 300B's filament (one per tube)
Each 300B has a high end Raven Audio Teflon capacitor across the filament pins
Clarity Cap acrylic encapsulated coupling capacitors bypass with film capacitor and Raven Audio Teflon capacitor.
Alps Blue volume control
Preamp/Buffer switch (bypasses volume control)
4 single ended inputs
2 single ended outputs
Output Impedance: 90 ohms

Asking $1,600 OBO

Please contact us with any questions comments or concerns you may have prior to purchase.

Offline Response Audio

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Please feel free to make an offer. In most systems, using this piece as a preamp provides a smooth yet detailed presentation as the signal goes through only 300B tubes. There are no other tubes in this piece to degrade the amazing 300B sound.
Used as a straight buffer. It makes for a great sounding output stage for most any source components. The selector is always active allowing up to 4 inputs with front panel LED indicators.
« Last Edit: March 06, 2019, 09:04:29 AM by Response Audio »

Offline Response Audio

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Price drop - $1, 250 shipped. Ready to ship.

Offline Response Audio

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    • Response Audio/Musica Bella Audio
SOLD..Response Audio/Purity Audio Custom 300B Vacuum Tube Buffer/Preamp
« Reply #3 on: March 22, 2019, 07:22:23 PM »
This piece has been sold. Now we can focus on the new, advanced  mk2 verion. Only need to design the chassis. Dont be surprised if it doesnt come out under the Purity name.😉