The Tube CAD Journal, Electrostatic Headphones Amps -Part = 2-

From: "Saved by Internet Explorer 11" Subject: The Tube CAD Journal, Electrostatic Headphones Amps -Part 2- Date: Wed, 8 Apr 2015 11:53:47 -0700 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0072_01D071F2.ABE1F140" X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.17609 This is a multi-part message in MIME format. ------=_NextPart_000_0072_01D071F2.ABE1F140 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.tubecad.com/december99/page2.html =20 =20 =20 =20 =20 The Tube CAD Journal, Electrostatic Headphones Amps -Part = 2-=20 =20 =20

= =20 =20


	Circulation: =20


	Since=20 3/23/99

25448 =20

Tube=20 Amplifiers for
Electrostatic Headphones
-part 2-
=

This=20 Issue


	Last month's OTL electrostatic = headphone=20 amplifier receives a thorough rethink this month. = Undoubtedly, many=20 of readers have preamps and amplifiers that will never be = finished:=20 they may be fully functional and sound wonderful, but next = month=20 they will be altered, modified, or rebuilt altogether, not = because=20 they were wanting in any real way, but because a new idea or = the=20 recent availability of some part or even boredom compels us = to not=20 leave well enough alone. Our friends and spouses will shake = their=20 heads and wonder if we wouldn't be better off buying some = cheap=20 table radio instead. My power amplifiers have gone through = at least=20 10 rebuilds, if not 20. It is said that you cannot hear my=20 amplifiers twice. One reader asked if the = ES OTL=20 outlined in last month's issue could be used to drive ES = speakers.=20 The answer is that the circuits in this month's article are = better=20 suited if scaled up. This month's design = idea=20 reveals how an expensive audio accessory can be = inexpensively=20 incorporated into existing components. Remember, = if you=20 have a request or suggestion of your own for either an = article topic=20 or circuit, please e-mail: = =20 = =20 Editor =


	First=20 electrostatic headphone amplifier (click image to=20 see enlargement)


	Second=20 electrostatic headphone amplifier (click image to=20 see enlargement)


	In last month's issue, we ended with = what=20 had = been done to last = month's final=20 circuit; in this month's issue we will continue with what=20 could=20 be done improve the design. Worthy goals for a better design = might=20 be better balance, more gain, greater voltage swings, lower = output=20 impedance, and less noise and distortion. = The=20 first stage can be used in two ways and consequently viewed = in two=20 ways. If an unbalanced input signal is used, then the second = triode's grid goes to ground and the circuit is a Long Tail = phase=20 splitter. On the other hand, if a balanced input signal is = used,=20 then the second triode's grid finds its own input signal and = the=20 circuit is a Differential amplifier.

In This=20 Issue


	1 13 15 =


	Electrostatic Headphone Tube = Amplifiers -part=20 2- Design=20 Idea: Polarized Wires E-mail Publishing=20 Information Glossary=20 of Audio Terms Glass-Ware.com=20 Articles


	www.tubecad.com Copyright =A9 1999 = GlassWare. All=20 Rights Reserved


	NEXT = >=

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