The Tube CAD Journal,SRPP Decoded

From: "Saved by Internet Explorer 11" Subject: The Tube CAD Journal,SRPP Decoded Date: Wed, 8 Apr 2015 11:38:09 -0700 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0057_01D071F0.7D12FAF0" X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.17609 This is a multi-part message in MIME format. ------=_NextPart_000_0057_01D071F0.7D12FAF0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.tubecad.com/may2000/ =20 =20 =20 =20 =20 The Tube CAD Journal,SRPP Decoded =20 =20

= =20 =20


	Circulation: =20


	Since=20 3/23/99

118915 =20

SRPP=20 Decoded

This=20 Issue

SRPP at=20 last

Editor,
Congratulations for your web-journal. = It is=20 unique and a joy to "receive", every month (if the May issue = is on=20 time, we'll forgive the April joke). ...I have not read = anything=20 about SRPP and mu-follower (with the possible exceptions of = hybrid=20 versions) operations. Are you planning to write something = about=20 them? or is there some kind of aversion for these = topologies, which=20 would be a real contradiction with the extraordinary = creativity and=20 openness displayed throughout the = Journal....
Olivier
=
=20 We have been meaning to expose the inner workings of the = SRPP=20 circuit for some time now, but we just have not got around = to it.=20 Why? Because this circuit topology is so popular, but so = little=20 understood, we knew that the SRPP would require a lengthy=20 explanation, which damped our ardor somewhat. Second, we had = hoped=20 to get a copy of the 1943 patent for the article, but we = never did.=20 In spite of which, here is what will surely prove to be the = first of=20 many articles on the SRPP circuit.
= 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 =
=20


	Symmetrical SRPP=20 and Fixed Bias SRPP =20


	This circuit has many names: SRPP, = SEPP, Totem=20 Pole, Mu Follower, Mu amplifier, Cascoded Cathode Follower, = and its=20 original name, the Series-Balanced amplifier (Feb. 1943, US = patent=20 2,310,342. Just what "SRPP" means is uncertain; maybe it = stands for=20 Series Regulated Push-Pull amplifier or Single-Ended=20 Reflexive Push-Pull amplifier. Wildly = popular, this circuit was the defining vacuum tube circuit = of the=20 90's. It appeared in high-end SE amplifiers, line stages, = phono=20 stages. Why all the fuss? This circuit promises the = advantages of=20 both the Grounded Cathode amplifier and the Cathode = Follower: high=20 gain and low output impedance. Yet, in spite of = its=20 popularity, few realize that it is not a single-ended = circuit. In=20 fact, most tube fanciers are shocked when told that this = circuit is=20 fundamentally a push-pull amplifier and not that radically = different=20 than the output stage of the a push-pull power amplifier = like the=20 Dynaco ST-70. "It must be single-ended=85look there's no = output=20 transformer!" (A quick re-read of the June=20 1999 article on push-pull amplifiers is encouraged.) = =20

In This=20 Issue


	1 17 19 =


	SRPP Decoded Design=20 Idea: A Safe Loftin-White E-mail Publishing=20 Information Glossary=20 of Audio Terms Glass-Ware.com=20 Articles Classic=20 Magazine articles


	NEXT = >


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

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