DIY Tube Stereo 35 Board - TubeZone Assembled -Instructions - Page 1 TubeZone Assembled Version Board and portions of manual, (c) 2006 Shannon Parks & DIYtube.com. Version specific instructions (c) 2006 Ned Carlson and Tubezone.net Inc. Reproduction in whole or part without express written permission prohibited.
DIY Tube Stereo 35 Board - TubeZone Assembled -Instructions - Page 2 READ ME FIRST! This is a modified version of the usual disclaimer/warning that comes with most transmitting equipment and parts. Since similar conditions exist in all tube audio amplifiers we believe it be appropriate here.
DIY Tube Stereo 35 Board - TubeZone Assembled -Instructions - Page 3 I strongly suggest you completely read this manual before you turn on your iron or get out the cutting oil. Preparation Before assembly, some preparation needs to done. Parts must be purchased, a work area needs set up and chassis decisions should be made. The axiom haste makes waste has never been more true. Make sure your chosen transformers and the board will fit comfortably using the chassis of your choice.
DIY Tube Stereo 35 Board - TubeZone Assembled -Instructions - Page 4 Installation Of Assembled Boards, Continued J2 PRIMARY: One plate lead from left channel output transformer (Blue-white lead from Z565) UL TAP: One screen lead from left channel output transformer (Green-white lead from Z565) GND: Ground secondary lead from left channel output transformer (Black lead from Z565) IMPORTANT NOTES: 1.
DIY Tube Stereo 35 Board - TubeZone Assembled -Instructions - Page 5 Initial Settings: Feedback and Bias WARNING: Do these adjustments with the unit off and unplugged, as well as having had one hour to bleed voltage from the filter caps. Note: Most amps will just use a fixed resistor here, but the diytube circuit uses a pot for experimentations sake thus this extra step. ➔ 1) Don't have your negative feedback connected yet, that is your output secondary or else it will be a real low impedance.
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DIY Tube Stereo 35 Board - TubeZone Assembled -Instructions - Page 7 Modifications And Notes Adding a volume control If volume controls are desired, use a 100k or better audio taper pot. A linear pot will not work correctly. You can salvage the 250k pot off of a Dynaco SCA35. Radio Shack has a 100k Alps stereo pot that many people use. Each channel must have its own control, so either a stereo pot or two single pots must be used.
DIY Tube Stereo 35 Board - TubeZone Assembled -Instructions - Page 8 Parts List- diytube/Tubezone Stereo 35 Rev D Revised: Sept 28, 2006 Board Parts QTY Reference Part _________________________________________________________________________ 2 R1,R2 47K, 1/4W 2 R3,R4 470K, 1/4W 4 R13,R14,R15,R16 220K 1/4W 2 R5,R6 1.
DIY Tube Stereo 35 Board - TubeZone Assembled -Instructions - Page 9 Parts List- diytube/Tubezone Stereo 35 Rev D Revised: Sept 28, 2006 Off Board Parts: Suitable equivalents or better parts may be used. The Mouser part numbers are just for easy reference, in case that's where you like to get your parts from. Due to the small quantities of nuts & bolts, you might want to buy these at your local hardware store rather than mail order.
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DIY Tube Stereo 35 Board - TubeZone Assembled -Instructions - Page 15 Original ST35 Dynaco schematic
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