The Tube CAD Journal, Electrostatic Headphones Amps -Part 2-pg = 3

From: "Saved by Internet Explorer 11" Subject: The Tube CAD Journal, Electrostatic Headphones Amps -Part 2-pg 3 Date: Wed, 8 Apr 2015 09:53:57 -0700 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_002D_01D071E1.EE698F20" X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.17609 This is a multi-part message in MIME format. ------=_NextPart_000_002D_01D071E1.EE698F20 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.tubecad.com/Classic_Articles/page4.html =20 =20 =20 =20 =20 The Tube CAD Journal, Electrostatic Headphones Amps -Part 2-pg = 3=20 =20 =20

=20


	= Fig. 2.=20 Comparison of Ultra-linear operation with triode and tetrode = operation using a push-pull stage without = feedback. =


	The situation is demonstrated = graphically in=20 Fig 2 where it can be seen that over a narrow band of = operation=20 where screen load impedance is about 18.5 per cent of plate = load=20 impedance, the new arrangement provides the high power = output of=20 tetrodes with low internal impedance such as is normally = obtained=20 from triodes, while distortion figures are equal or better = than the=20 extremes of operation. We have achieved a new tube type = without=20 designing a new tube. This tube is neither triode nor = tetrode, but=20 its improved linearity over either of those types justifies = the=20 designation "ultra linear." The Complete Amplifier=20 Circuit In=20 applying the ultra-linear output arrangement to complete = amplifier=20 circuits, it was found that the simple version of (B), Fig. = 1 could=20 be used to advantage. By feeding DC to the screens through a = properly placed tap on the primary of the output = transformer, the=20 operating conditions are preserved, and the close coupling = between=20 screen and plate is advantageous when feedback is carried = around the=20 stage. The disadvantage of this simpler arrangement is that = screen=20 and plate must operate at the same DC potential. In the = particular=20 arrangement used the screen and plate are operated at the = same=20


	potential (350 volts plate to cathode) without = exceeding=20 dissipation requirements, either quiescent or at maximum = output.=20 This new output coupling arrangement reduces screen = dissipation at=20 high levels and is a safe mode of operation with respect to = tube=20 life. A circuit arrangement has been designed to take = full=20 advantage of the ultra linear output stage. This circuit, = Fig. 3,=20 takes into account the necessity for complete stability = under=20 feedback conditions so as to eliminate tendencies toward = transient=20 instability under any type of load, including the varying = impedance=20 of loudspeaker systems. This complete circuit offers = linearity=20 of operation of a very high order. It is based around a = special=20 output transformer, the Acrosound TO-300, which is 6600 ohms = primary=20 impedance and has taps at the optimum point indicated in = Fig. 2. A=20 special seven-section symmetrical winding arrangement placed = on a=20 substantial grain-oriented lamination of unique shape = permits a=20 ratio of primary inductance to leakage reactance in excess = of 15,000=20 to 1. The response of the transformer alone is within =B1 1 = db from 10=20 to 100,000 cps with extremely low phase shift and no = resonances=20 within this band.


	pg.=20 3


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	www.tubecad.com Copyright =A9 2000 = GlassWare. All=20 Rights Reserved


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