ReadmeGM.txt All this material and accompanying files are (c) Copyright, 1997-1998 Steve Bench. All rights reserved. Permission is extended to build and use this equipment for your own use. You may not build-for-sale-or- other-personal-gain without royalty arrangement with the author. You may freely post this information on your web site; give the author credits, though. WARNING: This equipment, like most vacuum tube (valve) equipment, utilizes potentially lethal high voltages in its operation. The author is NOT RESPONSIBLE for any accidents using this equipment. Build AT YOUR OWN RISK. The Files contained in this folder are.. 1. GMMU.GIF - Schematic of Main RAT Tube Tester. Page 1 2. GMMU2.GIF- Schematic of second page option to RAT Tube tester. This page is optional, as described in GMMU1.TXT. 3. GMMU1.TXT- Description, theory of operation and parts list for the RAT gm/mu Tube Tester. Also describes the option later added for varying the filament voltage and adding a 4 pin socket to test older tubes. 4. GMMU2.TXT- Standard setups on the tube tester for many tubes. 5. GMMU3.TXT- AP Note 1. Describes how to characterize the linearity of a tube using the RAT tube tester. 6. GMMU4.TXT- AP Note 2. Describes how to find the bias point settings for a tube design using the RAT tube tester.