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A Low-Voltage Class-A Tube Headphone Amplifier - This OTL design features a
high-voltage power supply that is less than half of the one used in the author's first
amp and most other tube amps, but without compromising performance. Designed by
Helmut Ahammer (Circuit design added 04/05/06) |
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A Single-Ended OTL Amplifier for Dynamic Headphones - A simple OTL design
that uses just two tubes (dual triodes) for stereo. It has a common cathode input
stage direct-coupled to a cathode follower output stage. Designed by Aren van
Waarde (Circuit design added 04/05/06) |
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A SRPP-Input Tube Amplifier For Headphones & Loudspeakers - This
transformer-coupled design uses a series regulated push-pull input stage and a
parallel-triode cathode bias output stage. The audio output transformer is hand-wound
from a kit. The amp will drive both headphones and speakers. Designed by Tony
Frazer (Circuit design added 04/05/06) |
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A Tube Headphone Amplifier/Preamp with Relay-Based Input & Power Switching -
A tube headphone amplifier inspired by the "Top-Level" and "No-Compromise" amps of
Andrea Ciuffoli, except that the output stage uses a triode-connected pentode. Because
this amp also serves as a preamp, the author has put in a sophisticated relay-based
switching system (both input source selection and power supply). The power supplies
also feature slow-on....Designed by Helmut Ahammer (Circuit design added
04/05/06) |
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A Vacuum Tube Microphone Preamp/ Direct Box Project - From January 1997 EQ
Column, includes phantom power supply....(Circuit design added 10/06) |
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A Zero-Feedback SRPP-Input Headphone Amplifier - Features a series regulated
push-pull input stage and transformer-coupled output stage with an output impedance of
about 2.5 ohms. It has zero global feedback for open, natural sound without any
harshness. Designed by Simon Busbridge (Circuit design added 04/05/06)
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All-Triode Direct-Drive Tube Amps for Electrostatic & Electret Headphones -
Two electrostatic headphone driver designs: the second is DC-coupled and uses high
voltage Apex op-amps as DC regulators. They will drive Stax and Sennheiser
electrostatic phones, and the author includes directions for adapting the designs to
other models. These are "the best electrostatic headphone amplifiers currently
available, anywhere in the world." Will also drive electret headphones. Recommended
only....Designed by Kevin Gilmore (Circuit design added 04/05/06) |
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Altec 1566A:Vacuum Tube Preamp & Direct Box Project - There are all sorts of
tube circuits, some of which actually deliver The Sound people associate with Vacuum
Tubes. Did you know, for example, that asymmetrical distortion generates
even-order harmonics while symmetrical distortion produces odd-order harmonics?
Neither vacuum tubes nor transistors are exclusively responsible for either type of
distortion,....(added 4/02) |
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Baby of Camel: All-directly-Heated Pushpull Amp-Spy Photos - Project a Camel
is a take-no-prisoners DHT PP based on Lynn Olson Aurora topology. Unfortunately, I'm
stuck waiting for Lundahl transformers (three months....that famous Nordic attention
to detail....one turn a day....).Well, before Camel is born, there was his baby
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Battery heaters in a tube Amplifier - This simple circuit controls 6.3V SLA
heater batteries (two batteries are shown, but it is stackable to practically
unlimited number of batteries). Batteries are floating in 'on' state, paralleled in
'off' (external charger) state. If any battery voltage falls below threshold for more
than 1 second, the circuit latches up in 'off' state, disconnects the batteriesr....(electronic
design added 07/07/07) |
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Brute Force In A Line Stage (100% Tube!) - An OTL mu follower design. "One,
often forgotten, purpose of the preamp is to drive headphones. I listen with a pair of
AKG K240s, which is a relatively easy load to drive. This all-tube line stage
and driver can power them, without resorting to output transformers." Designed
by Eric Barbour (Circuit design added 08/08/08) |
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Capacitive Sensor - Special design for shop-windows animation. Useful
for many types of touch controls. (electronic circuit added 06/07/08)
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Designing A Pocket Equalizer for Headphone Listening (Solid State & Tubes) -
Design principles and circuits for building opamp-based headphone amplifiers.
This article reviews selection criteria, feedback configurations, capacitor coupling,
RF shielding, output stage topology, short circuit protection, equalization, acoustic
simulation, headphone distribution amplifiers and power supply options.
Also....Designed by HeadWize (Circuit design added 04/05/06) |
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Direct Coupled 15 Watt Amp - ….... |
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Dynakit Mark E 40 Watt Power Amplifier - (circuit / schematic added 09/08)
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Get more power with a boosted triode - 12-Jun-03 Issue of EDN This Design
Idea is a reprint of an earlier one that contained errors in graphics (Reference 1].
Even though 6L6 beam-power tubes have been around for 66 years, they are still quite
popular for use in electric-guitar amplifiers, and its cousin, the 6CA7 (EL34] power
pentode, is a favorite among audiophiles.... [Design Idea by Dave Cuthbert, Boise, ID] |
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