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How to Improve Your Amp's Tone with Preamp Tube Swaps
Good tube amps can cost thousands of dollars but the little Nobsound gives you a nice taste for a couple hundred bucks It’s a really nice little amp 5stars for value 4stars for performance (edit I went back and gave the performance 5 starsit’s just too good for the money to leave it at 4 starsit’s not world class but is the among the best sound you can get from an amp in this.
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The tone control preamp uses the wellknown IC 4558 The symmetrical power supply module also included in the PCB 120W Power Amplifier + Power Supply This is 120W power amplifier schematic using TO3 package complementary transistors NPN and PNP polarity The wellknown power transistor pair of 2N3055 and MJ2955 used in this circuit +/ 50V symmetrical.
Electronic Circuit Diagram Schematic & PCB Design
The Bass Tone Control circuit is a small value cap with a variable bypass More bypass gives you more bass fully bypassed (full clockwise rotation) gives you a normal full frequency signal The mica cap should be rated for 100v or higher Download the pdf here and the DIYLC file here Bass Cut Control This control is the opposite of the above Bass Tone Control As you turn the pot.
Valve Tone Control Circuit Build Electrical Engineering Stack Exchange
6.8W x 2 Amazon.com: Nobsound 6P1 Vacuum Tube Power
Online Schematics Pacific T.V. Online Tube Catalog
Amp Mods Rob Robinette’s Car and Tube Amp Website
The following discussion of preamp tube swaps therefore will focus on the effect of changing out the tube in that position but be aware that you will want to refer to your amp manufacturer’s user’s manual schematic or other technical information for the amp in question to ensure you are correctly locating the first preamp tube in the channel to which you want to.