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 NEW    Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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12au7 preamp

In this build I employed a single stage tube preamp to provide gain and volume control to my 3W 6AS7 SET amp. This preamp uses a 24VAC wall wart and by configuring a 24/240V step down tranni to work backwards I can gain 280VDC across the 12AU7. No hook-up wire is used in the amp cct. only component-2-component wiring. The preamp produces no hum or buzz. It extends to a deep rich bass and very natural mids and highs. The frequency response is flat from 10hz to 130KHz and square way performance is exceptional. There is more information in the Super simple single stage tube preamp thread on the forum.

http://www.retro-thermionic.blogspot.com/

Push-Pull_6L6_Tube_Amplifier_Bottom.jpg Push-Pull__Amplifier_6L6_Tube_Glow.jpg 12au7_4S_preamp.jpg Copper_Steampunk_K-12GTube_Amplifier_Kit.jpg Copper_Steampunk_K-12GTube_Amplifier_Kit_2.jpg
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Filename:12au7_4S_preamp.jpg
Album name:Vacuum Tube (Valve) Audio Projects
Filesize:56 KiB
Date added:Jun 28, 2011
Dimensions:1035 x 776 pixels
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