Andrew Pilling
"Ampli-Voltra-Phone" Tube Headphone Amplifier
The "Ampli-Voltra-Phone" Headphone Amplifier is not very typical in It's appearance.
I used a 1930's General Electric AC/DC voltmeter as It's chassis and portable case.
Once the voltmeter had been gutted, the stripped down, the "Bakelite" faceplate had all the right size openings that I needed for mounting controls and other components.
On the front left side of the faceplate; I easily mounted a pilot light, on/off switch and the fuse receptacle.
On the front right side I mounted the volume control knob and the headphone jack socket.
I used the metal plate that held the scale read gauge on the voltmeter to mount the four tubes and the amp circuit components that were all wired into place below the plate.
The IEC-C20 AC socket and the two RCA sockets were mounted to the sides of It's Mahogany wooden case.
The 8' IEC AC cable easily tucks away under the top lid.
This "Ampli-Voltra-Phone" Headphone Amplifier sounds absolutely "True" and makes for a wonderful conversation piece.
The "Ampli-Voltra-Phone" has a simple "OTL" circuit design that uses a pair of 6CG7 electron tubes that drive a pair of 12AU7 Electron tubes along with several resistors, capacitors, diodes and a power transformer that make up the heart & soul of the Amplfier.
"Ampli-Voltra-Phone" Tube Headphone Amplifier
The "Ampli-Voltra-Phone" Headphone Amplifier is not very typical in It's appearance.
I used a 1930's General Electric AC/DC voltmeter as It's chassis and portable case.
Once the voltmeter had been gutted, the stripped down, the "Bakelite" faceplate had all the right size openings that I needed for mounting controls and other components.
On the front left side of the faceplate; I easily mounted a pilot light, on/off switch and the fuse receptacle.
On the front right side I mounted the volume control knob and the headphone jack socket.
I used the metal plate that held the scale read gauge on the voltmeter to mount the four tubes and the amp circuit components that were all wired into place below the plate.
The IEC-C20 AC socket and the two RCA sockets were mounted to the sides of It's Mahogany wooden case.
The 8' IEC AC cable easily tucks away under the top lid.
This "Ampli-Voltra-Phone" Headphone Amplifier sounds absolutely "True" and makes for a wonderful conversation piece.
The "Ampli-Voltra-Phone" has a simple "OTL" circuit design that uses a pair of 6CG7 electron tubes that drive a pair of 12AU7 Electron tubes along with several resistors, capacitors, diodes and a power transformer that make up the heart & soul of the Amplfier.