Hybrid Amplifier Single Ended.

By Salihin Untar – Cinere - Depok - Indonesia

First time I created an electronic audio blog on the website. Hopefully I can be useful to listen to the sounds from what I made. I have tried audio circuits on the market both Power amplifiers using Ic's, Transistors, Mosfet. This time I tried hybrid amplifiers using tubes , transistors and Mosfet.

On the other hand, I think also that constant current souce is very important in amplifier stability and also the sound produced is really pure an amplifier class.

For the current souce, I use each current source with 2 bipilar transistors or a combination with mosfet at the output stage.

I only test with a device that I have a cheap multimeter and also with the touch of a finger to find out the ac output voltage that comes out of an amplifier without or oscillator, wave generator and so on and I just hear the sound produced. make. Pure Class-A single-ended Hybrid Amplifier

Strengthening the preamp tube is approximately 20x (40db) and also for the 10k / 1k + 1 = 11x (20db) power amplifier stage.

Strengthening the preamp tube is approximately 23x (30db) and also for the 10k / 1k + 1 = 11x (20db) power amplifier stage.

The choice of class A

From the above it should be obvious that the choice of class A not is taken just to be eccentric. In contrary it is not difficult to find good arguments to let the amplifier work in class A.

The advantages can be summarized as:

• No cross over distortion
• No switching distortion
• Lower harmonic distortion in the voltage amplifier
• Lower harmonic distortion in the current amplifier
• No signal dependent distortion from the power supply
• Constant and low output impedance

• Simpler design
• Lower distortion
• Higher suppression of ripple and noise from the power supply
• Lower output impedance
• Better DC stability
• Suppression of interference from the loudspeaker connection

Note:

The function of Rload and Cload is very important to prevent high frequency that we don't want from the preamplifier output tube. In other words, if there is a problem with something from the Power Amplifier input signal, Rload will heat up and burn, so this is to prevent (meaning there is a problem with the Tube Preamplifier Series.)

Referensi and thank you :

-The Cathode Follower and Feesback author : N.H.Crowhurt

-Current Sources, Sinks and Mirrors in Audio author Elliott Sound Products

-IRF150 Hybrid Amp , Schematic by Bernard Duval (LED magazine, Winter 1996).

-Headphone amplifier - ETI June 1984

-Electronics and wireless world January 1985

-All Arcticle by Elliott Sound Products

-All Article F5-Amplifer,Pass Zen