12AU7 PreamplifierBuilt By Blair Chapmanused12AU7 Preamplifier Built By Blair ChapmanI am the first owner of this hand built preamp, and have enjoyed it immensely with my SET amplifier and OB speakers. I am only selling to fund a preamp build of my own (it will be my first). The on...400.00

12AU7 Preamplifier Built By Blair Chapman [Expired]


no longer for sale

I am the first owner of this hand built preamp, and have enjoyed it immensely with my SET amplifier and OB speakers. I am only selling to fund a preamp build of my own (it will be my first). The only change to the original design is that I replaced the coupling capacitors with Jantzen Superior Z caps, which was Blair's recommendation (and a significant performance upgrade). The amp is in terrific condition and has no issues. I have shipped many pieces successfully, and have perfect feedback on US Audio Mart, the Klipsch forum and on Ebay (softrideguylg). Shipping is a $25 flat rate in the CONUS.  I will answer any questions to the best of my ability, just ask!

From the builder (Blair Chapman) in his original sale ad on Audiogon (I am the first owner). A link to the original ad is shown below (scope images are referenced in the original Audiogon ad):

https://www.audiogon.com/listings/tube-12au7-preamplifier-blair-chapman-2017-08-20-preamplifiers?show_listing=true

This preamplifier is a 12AU7 tube based preamp in SRPP configuration. Features a layered plywood chassis, 2mm thick 6061 aluminum top plate.

- Gold plated RCA connectors

- Low noise toroidal power transformer

- Power supply is all point to point, but mounted to a piece of 1/8" fiberglass

- Audio circuit is full point to point

- High quality new tube sockets

- Alps (Real and NOT eBay replica crap)

- RCA tubes

If you look at the images, this unit is dead flat from 20Hz-20kHz! Look at the sine waves at 20Hz (Sorry, it is hard to snap a picture at 20Hz), 1kHz and 20kHz.

I have been doing this for many years and maintain my reputation as one of the most honest and reasonably sellers. Please let me know if you have any questions.

I rate my gear 8/10 due to the DIY nature of my gear. All components, minus tubes because I prefer older tubes are brand new and high quality. The smudge looks on the top plate are simply finger prints. It is a swirl sanded look that I will clean with alcohol before shipping.

tlarwa member since December 2007

 
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