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This is a Tube / Valve Preamplifier that I designed for both Guitar, Microphone and Line Audio applications.Using a Miniature Raytheon Military Pentode and operating on 9 volts. I have these kits listed on Ebay for a few dollars each. These work by using a novel bias technique. Being Battery powered there is no Hum or Earth loops to worry about, battery life is over 200 hours! Can be wired for Pentode or Triode operation. More info can be found at http://hvtubes.com
Visit my Ebay store for cheap prices.
http://stores.ebay.com.au/VK3KCG
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Click image to see a larger version
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The Kits are now Miniaturised so they can fit inside most Guitars. | 
