Tag: diy_audio

16 November 2013 » Tubelab DIY Amps

Simple Push-Pull (SPP) Board

Simple Push-Pull (SPP) Board

Why have I done “yet another version of this common design?” I have breadboarded countless variations of small P-P amps. Some used the 6AQ5 tube, and some used the 6BQ5 / EL84 tube. Every amp was evaluated for performance, simplicity, and most important, the ability to be assembled by builders of varying skill levels and work the first time. One of the main requirements was for a stable design that didn’t require any component tweaking to make it work. This design worked out to be the best. I chose the 6BQ5 / EL84 tube mostly because that is what was requested in the email that I received. The 6AQ5 is cheaper but produces slightly less power, and a slightly different sound. I may produce a 6AQ5 version of this board if there are enough requests for it.

As usual the board can be wired for triode, UL and pentode mode. Provision for global negative feedback is available. It can be used if needed, and it is needed in pentode mode.

30 December 2013 » Random Audio Parts

Random Audio Parts

C&K Brand Silver contact toggle switches

Switch types for home brew Cinemag SUT?

RE: Switch types for home brew Cinemag SUT?

Posted by steal2B (A) on December 22, 2013 at 12:29:12

In Reply to: RE: Switch types for home brew Cinemag SUT? posted by John Elison on December 22, 2013 at 11:42:24:

C&K Brand Silver contact toggle switches

RE: “C&K Brand Silver contact toggle switches”

Posted by 1973shovel (A) on December 23, 2013 at 01:48:49

In Reply to: RE: Switch types for home brew Cinemag SUT? posted by steal2B on December 22, 2013 at 12:29:12:

Yep, that’s what I used when I built my CineMags. They’re a quality switch, relatively inexpensive, and readily available at Mouser, etc.

06 January 2014 » Classic Valve Designs

Classic Valve Audio Designs

25 January 2014 » 12b4 Tube

Tube Stores

12B4 pre-amp recommendation

Audio Asylum - Tube DIY

Two Terminal Constant Current Source

K and K Audio

Low Voltage Power Supply

power supply kit After cobbling together untold numbers of small power supplies for "auxiliary" functions in tube preamps and power amps, I decided to design something with a regulator that is better than the ubiquitous 7800 series three terminal regulator and try it in places where it powers something more than relay coils. In locations like low voltage negative supplies and as power for a USB to SPDIF digital audio converter I found this supply sonically superior to my previous slapdash efforts. This power supply uses the LT3080 regulator, which is adjustable by changing one resistor for output voltages between 1 and 24 volts DC in this implementation. A charging slope lowering resistor and Schottky rectifier diodes are provided to be kind to the power transformer and reduce both supply noise and radiated magnetic field noise. Along with plenty of output bypass capacitance, this compact package does a thorough job of supplying up to 4 watts of power at low voltages. Resistors are provided for 5, 6.3, 8, and 12VDC. You can obtain other 0.25w resistors for other voltages. The supply can accommodate both 115V and 230V mains voltage and has an on-board fuse holder for safety. With the standard supplied 8+8 volt secondary power transformer, the maximum possible DC current draws are approximately:

  • 5VDC 870mA
  • 6.3VDC 700mA
  • 8VDC 550mA
  • 12VDC 470mA

The PC board is 2.75" (7cm) x 3.3" (8.4cm) and the height is 1.6" (4cm).

Low Voltage Power Supply Kit:

$36

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