Tube Power amplifier using EL34 in Triode connection and CFB technique,paraphase inverter 12AX7

EL34 PP CFB

EL34 PP CFB

EL34 Triode connection Push Pull CFB Paraphrase Inverter Amplifer Schematic from Bartolomeo Aloia Project and Hammond Transformer

This is my first Tube Hi Fi amplifier, I choose to start from a  Bartolomeo Aloia project :
VTAF Volks Tube Amplifier The First by Bartolomeo Aloia
 you can find details on audiodesignguide page.

The project is based around a EL34 triode conection push pull.
The output transformer is a Hammond 1615 witch I would use in Chatode Feddbak connection.

Paraphrase imput stage and phase splitter is a  modified GY50 driver stage board .

Phase Splitter Prototipe Paraphrase inverter

EL34 triode push pull CFB amplifier schematic

My PCB GY50 Evolution Power Hybrid Amplifier

Here my new circuit boards about Aloia's amplifier GY50.

My new GY50 50W  Hybrid Power amplifier DIY Board 
IRFP240
2SC3281 - MJL3281
2SA1302- MJL1302

Audiograde output capacitor

"ready to run" GY50 Boards

My Personal GY50 Hardware Project Development PCB

My GY50
Made in August 2004 on Aloia's Project

Current Amplifier Output Power Stage:

VAS stage 12AX7 - ECC83:

Project About Aloia's TriodoSolido Style Hybrid Amplifier 100W

Clone of Aloia's Amplifier called Triodosolido.
Semplified versione whitout Protection and Limiters circuits

Tubes are 2 x 6SN7 double triode.
Output BJT 2SC3281 2SA1302
Tube VAS Supply300Vdc
Catode Follower Rail Supply: 50Vdc, -50Vdc
No Negative Feedback (0 Negative Feedback)

My Personal GY50 Hybrid Amplifier 50W 8 ohm

My Personal Copy of Famous Aloia Hibrid Amplifier GY50. Amplificatore GY50 .

Amplifier using Vacuum Tube, ECC83/12AX7, for VAS Stage and Triple Stage of Emitter Follower in the Output Power Stage.
Power Output Devices; Toshiba 2SC3281 2SA1302.
All Regulated Power Supply.
No Overall Negative Feedback.
50W/8ohm, THD<1%
Made by Altium Design / Protel  CAD Database


Schematics:

Regulated Power Supply of  Power Stage

Output Power Stage Triple Emitter Follower

Vacuum Tube VAS Stage

Vacuum Tube Power Supply 

Amplifier and Power Supply  PCB , Printed Circuit Boards:

Power Output Stage, Output devices 2SC3281-2SA1302

Signal VAS Prited Circuit Board 12AX7/ECC83

Signal Stage Power Supply

Current Buffer Regulated Power Supply