Building Valve Amplifiers (2nd Edition) by Morgan Jones

By Morgan Jones

Construction Valve Amplifiers is a special hands-on consultant for someone operating with tube audio equipment--as an electronics hobbyist, audiophile or audio engineer. This 2nd variation builds at the luck of the 1st with expertise and approach revisions all through and, considerably, a big new self-build venture, labored via step by step, which places into perform the rules and methods brought during the book.

Particular consciousness has been paid to answering questions frequently asked by way of beginners to the area of the valve, no matter if audio fanatics tackling their first construct or more matured amplifier designers trying to know about the layout ideas and trade-offs of "glass audio." protection issues are constantly to the fore, and the sensible facet of this booklet is bolstered by way of a variety of transparent illustrations throughout.
• the one hands-on method of development valve and tube amps--classic and modern--with at the least theory
• layout, development, fault-finding, and trying out are all illustrated by way of step by step examples, permitting readers to obviously comprehend the content material and achieve their very own projects
• incorporates a whole self-build amplifier undertaking, placing into perform the main strategies brought during the book

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Additional resources for Building Valve Amplifiers (2nd Edition)

Sample text

An extremely useful facility on a power amplifier is to add a muting switch that applies a short circuit to the input of the power amplifier. 20. 20 This muting switch at the input of the amplifier enables audio leads to be swapped without the necessity of switching the amplifier off. 34 Chassis layout Not only does the muting switch enable the amplifier to be plugged to different sources without having to switch it off and then on again, but it is very handy when the amplifier is being tested.

Grid bias inevitably requires some means of monitoring cathode current. If you are in a “retro” mood, you will fit a handsome round black moving coil meter and a rotary switch having a black bakelite knob allowing each individual cathode current to be monitored, and if you are feeling really keen, you will add positions on the switch to allow key voltages to be monitored. The monitoring is important, so you will want to fit the meter and associated switch towards the front of the amplifier. The meter’s permanent magnet creates a stray field, so you won’t want it to be close to beam valves such as KT66, 6L6, KT88, or 6550 because it might affect DC screen grid current.

21. When planning the positions of the major parts, it is important that one part should not obscure electrical connections or securing screws of another unless it can be easily moved aside to gain access. Think carefully about accessibility of fasteners. It’s time to reconsider if you can’t easily apply a spanner or nutdriver to a nut, or a screwdriver to a screw head. If there’s really no choice about nuts being inaccessible, consider securing the part with a single 3 mm plate having tapped holes in lieu of individual nuts.

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