The Tube CAD Journal: Simple Hybrid headphone amplifier

From: "Saved by Internet Explorer 11" Subject: The Tube CAD Journal: Simple Hybrid headphone amplifier Date: Mon, 21 Apr 2014 15:59:01 -0700 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_002D_01CF5D7A.9C9C0E60" X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.17609 This is a multi-part message in MIME format. ------=_NextPart_000_002D_01CF5D7A.9C9C0E60 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.tubecad.com/april_may2001/page13.html =EF=BB=BF =20 =20 =20 =20 =20 The Tube CAD Journal: Simple Hybrid headphone amplifier = =20 =20

=20

The Tube=20 CAD Journal=20 signature noise canceling technique of using a partially = bypassed=20 cathode resistor for the first stage is implemented. The=20 potentiometer allows for idle current adjustment, which can = be read=20 from the voltage drop across the .22 ohm resistors. The = LF411 Op-Amp=20 works to reduce the DC offset at the output. All in all, we = have=20 moved quite a bit from the world's simplest hybrid = amplifier. =20

Simple=20 Hybrid
Headphone Amplifier
The following circuits do not = really follow=20 the previous thread other than illustrate simple designs. = The first=20 circuit was born out of a desire to come up with a portable = tube=20 headphone amplifier.
=

Here is where the tube fans have it = all over=20 their solid-state brethren. Tube fanciers are happy to live = with the=20 3 watts that a miserly 2A3 gives us in a single-ended=20 amplifier...but what a nice 3 watts.
= This=20 headphone amplifier does not use the 12AU7 to its best = advantage, as=20 it current starves the 12AU7. The second version uses a FET = current=20 source to both reduce the noise at the output and to = increase the=20 idle current. The cathode follower is eliminated and, like = the=20 previous circuit, it uses the 12AU7's heater element as the = load for=20 the output MOSFET. The potentiometer sets the idle current. = If an=20 auto-bias is desired, the last circuit should prove helpful. = The=20 base-to-emitter voltage drop is used as a voltage reference, = which=20 the transistor uses to compare against the voltage across = 4.6=20 resistor.
=

The MOSFET chosen for this = application is a=20 true sleeper. The 2SK2013 is a very linear power MOSFET with = a truly=20 useable negative temperature coefficient. However, it is not = destined to become popular because of its paltry 25 watt = dissipation=20 limit. Remember the food choice. Well, when choosing = solid-state=20 devices, twice the food of half the quality always wins. The = 2SK1530=20 with its 150 watt dissipation limit, will find a = thousandfold=20 greater use. Yet it is a much poorer choice in terms of = audio=20 purity.

Improved = simple hybrid=20 headphone amplifier

Auto-bias hybrid=20 headphone amplifier


	<=20 PREVIOUS


	www.tubecad.com Copyright =C2=A9 2001 = GlassWare All Rights Reserved =


	NEXT=20 >

Pg.

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