Schematic Directory

IMPORTANT STUFF: The schematics shown below are the sole property of The Vacuum Tube Collective. Any attempt to duplicate these circuits may result in fantastic sounding amplifiers, or the need to rebuild one's workshop after the fire has been put out. The Collective assumes no responsibility for the misuse of the schematics, and makes no claims of warranty.

Click Here to See the Dowless 18

Dowless 18 - Based on the Nielsen 18 with the addition of a single 6AV6 gain stage up front. Inductor L1 value unknown. Resistance is 597 ohms Black Blue wires. Red wire not used. Original circuit from a 1960's era Gulbransen organ.

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Click Here to See the Hitman Jr.

Hitman Jr. - Based on Matchless Spitfire. V1 both sections connected in parallel. All signal caps 630v Polyester. All resistors 1/2 watt unless noted.

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Click Here to See the Nielsen Kill-O-Watt Amplifier Schematic.

Nielsen "Kill-O-Watt" - conversion of Roberts/Akai Tape Recorder Amp Models 990 or 997.

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Bradshaw 18 TMB

The Brother-in-law schematic. It's mostly and Matchless spitfire with some changes, and based on our "ebay" PTs. By Lorne Bradshaw.

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Victor #1

The Nielsen Victor #1 schematic.

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Copyright 2009 Vacuum Tube Collective | Updated: 10 Jun 2010