Valve Amplifiers, Fourth Edition

By Morgan Jones

Valve Amplifiers has been famous because the such a lot finished advisor to valve amplifier layout, research, amendment and upkeep. It presents a close presentation of the rudiments of electronics and valve layout for engineers and non-experts. The resource additionally covers layout rules and building innovations to aid finish clients construct their very own software from scratch designs that paintings. The author's strategy walks the reader via every one step of designing and developing, beginning with an outline of the fundamental operating ideas of valve amplifiers, the straightforward and intricate levels, the method of linking the levels, and finishing the layout.
The ebook is constituted of seven chapters all of which come with a DIY consultant dialogue of sensible features. The textual content begins with familiarization of the basics of electronics, that are crucial for designing and development valve amplifiers. specific realization has been paid to supplying ideas for questions which are frequently asked and confronted via newbies in valve designing and building.

Valve Amplifiers is a masterful hands-on advisor for either specialists and newbies who paintings with tube audio apparatus, and for digital hobbyists, audio engineers, and audiophiles.

* the sensible consultant to research, amendment, layout, building and upkeep of valve amplifiers
* The absolutely up to date method of valve electronics
* crucial studying for audio designers and tune and electronics fans alike

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This is often excellent news since it signifies that we don’t need to use the pricy 6. three V heater valves, yet can use the more cost-effective and extra ample 12. 6 V heater valves and luxuriate in the aid in electromagnetic hum brought on by their decreased heater present, even though the better heater voltage factors commensurately extra electrostatic hum. the importance of buying and selling electromagnetic hum for electrostatic hum is that even if either kinds may be shielded, earthed aluminium cooking foil is an efficient electrostatic guard, while powerful electromagnetic defensive calls for a much higher thickness of iron or pricey mu-metal. evidently, either difficulties disappear if we use regulated DC warmers. a practice the writer has followed a practice that may be utilized all through this e-book. Having verified that the 6J5GT, 6SN7GT, 12SN7GT, 7N7 and 14N7 are electrically nearly exact, and that the 8SN7GT and 25SN7GT might be anticipated to be related, economic system of nomenclature is important. to any extent further, this relations might be known as the *SN7/*N7 relatives (to distinguish among the bases and capacitances). Please notice that the 6N7 is a very diversified beast, and bears no relation to a 7N7. substitute Medium- μ Valves desk three. 12 indicates attainable possible choices to the *SN7/*N7 relations. desk three. 12 electric possible choices to the *SN7/*N7 kinfolk for every valve, μ used to be learn from the manufacturer’s anode curves on the eight mA working element. TypeμSamplesH21 σH31 σH41 σH51 σH61 σ 7AF7 sixteen four −38 zero. three −62 1. five −74 zero. 6 −89 four. 2 −91 five. 7 ECC82/12AU7/B329 18 28 −37 −56 1. four −73 three. nine −86 6. 6 −96 three. 1 E182CC/7199 18 30 −45 1. 7 −70 1. five −92 three. 7 E288CC 20 14 −49 1. three −69 zero. nine −89 five. four −95 7. 2 −96 four. nine 37 nine nine −45 zero. 6 −69 four. nine −87 five. 7 −88 10. 1 −86 14. 2 5687 (various) sixteen 22 −49 1. 1 −72 1. 7 −91 three. nine Philips 5687WB sixteen 14 −42 2. five −68 2. eight −92 2. four 6350 20 26 −44 1. four −65 2. four −84 2. four −98 6. 2 desk three. thirteen permits fast comparability of those choices through normalising their distortion to the 6SN7GT/12SN7GT. desk three. thirteen Distortion (normalised to 6SN7GT/12SN7GT) of electric choices to the *SN7/*N7 relatives TypeSamplesH2H3H4 dBRatiodBRatiodBRatio 6SN7GT/12SN7GT forty four zero 1 zero 1 zero 1 7AF7 four +12 four +23 14 +23 14 ECC82/12AU7/B329 28 +13 four. five +29 28 +23 14 E182CC/7199 30 +5 1. seventy eight +15 five. 6 +4 1. fifty eight E288CC 14 +1 1. 12 +16 6. three +7 2. 2 37 nine +5 1. seventy eight +16 6. three +9 2. eighty two 5687 (various) 22 +1 1. 12 +13 four. five +5 1. seventy eight Philips 5687WB 14 +8 2. five +17 7. 1 +4 1. fifty eight 6350 26 +6 2 +20 10 +12 four the implications in desk three. thirteen converse for themselves. all the possible choices are not so good as the 6SN7GT/12SN7GT and convey considerably extra H3. The Loctal 7AF7 twin triode and B9A ECC82 twin triode are rather ghastly. probably considerably, those valves have an electrode constitution that considerably diminished Cag in comparison to the *SN7/*N7 relatives (2. three pF and 1. 6 pF as opposed to four. zero pF). those checks recommend that the measures essential to decrease Cag in the electrode constitution may well adversely have an effect on distortion. there has been an important distinction among the Philips 5687WB and different brands’ samples, so this sort was once remoted.

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