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The 6N1P OTL Headphone Amplifier - This version of the optimized
Morgan Jones headphone amplifier uses 6N1P dual triode tubes and a standard
power supply. The author provides extensive construction details. Includes
simulation files for use with OrCAD Lite software. Designed by Bruce
Bender (Circuit design added 01/08) |
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The Morgan Jones Mini Tube Headphone Amplifier - This
reverse-engineered version of the famous EarMax headphone amplifier has just
3 tubes, uses no global feedback, and is powered from an 19VAC wall-wart.
Includes two additional versions of this amplifier optimized for
driving...[Designed by Chu Moy] |
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The SESS Tube Headphone Amplifier - The author describes the
construction of a very simple single-ended, single-stage, single-tube (SESS)
tube headphone amplifier with a reference power supply that uses a tube
rectifier in a hybrid Graetz bridge configuration. Designed by Andrea
Ciuffoli (Circuit design added 01/08) |
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The T-Files: Real Tube Curves from the Tracer - ….(Circuit design
added 07/07) |
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Top-Level OTL Tube Headphone Amplifier - This article shows my tube
headphone amplifier designs for driving headphones with an impedance of 200 to 600
ohms (I am using these amplifiers with the Sennheiser 580, which has a 300-ohm
impedance). The problem with many tube headphone amplifiers....(Circuit design added
07/06) |
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Tube 829 RF power Amplifier - ….(electronic schematic added 08/08) [Site is
under construction right now] |
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Tube active crossover - (diagram added 2/07) |
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Tube Amplifier Kit - The amplifier kit uses two 11MS8 tubes per channel. The
two DC blocking capacitors and the four coupling capacitors are metallized polyester,
while Samsung aluminum electrolytic capacitors are used to filter the solid-state
power supply. ….(design added 11/08) |
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Tube Amplifiers - (electronic schematic / circuit added 4/02) |
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Tube circuit provides linear tuning - 11/05/98 EDN-Design Ideas....Parallel
LC circuits that you tune by changing capacitance have a nonlinear
frequency-versus-voltage or frequency-versus-shaft-position characteristic. The
frequency of an analog-tuned circuit is proportional to the reciprocal of the square
root of the tuning capacitance. When you tune a bandwidth….contains several circuits,
scoll to find this one…. [Design Idea by Lyle Williams, Electronic Technical Services,
New Orleans, LA] |
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Tube curve tracer - ….(electronic schematic added 07/07) |
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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). T....Designed by
Helmut Ahammer (Circuit design added 08/08/08 |
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Tube Microphone Preamp - (circuit / schematic design added 6/06)
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Tube Microphone Preamp Generic Input Stage - AS020 Jenson Transformer
Application Note (app note 6/07) |
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Tube Opamps - Photos of an antique analogue computer unit (Soviet,
naturally!) ….(electronic schematic added 07/07) |
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TurboVision Turbo Express TV Tuner - ….(electronic schematic added 03/08)
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Two Valve 40m CW Transmitter - amateur radio construction projects….circuit
only, no description given…. [from Peter Parker's website] |
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Vacuum Tube Microphone Preamp/Direct Box Project - from January1997 EQ
Column, includes phantom power supply (added 5/02) |
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Vacuum Tube Opamp Circuit - Published In Glass Audio #3/1995 (Circuit
design added 08/08/08) |
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Variable Amplifier Impedance - Figure 1 shows two amplifiers (shown as
opamps), with (a) being conventional voltage drive, and (b) is current drive. The
output impedances are in the order of zero ohms and infinite ohms in each case (this
IS a theoretical discussion at the moment!). The gain will appear to be exactly the
same for each into an 8 ohm resistive load,.... |
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Yaesu Band decoder schematic - (electronic circuit added 4/05) |
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Yaesu FT 736R Doppler Compensation - (electronic design / schematic added
2/05) |
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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 01/08)
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