AmpDiVa VT-138 Vumetron Loves Instructions
- June 1, 2024
- AmpDiVa
Table of Contents
AmpDiVa VT-138 Vumetron Loves
Product Information
Specifications:
- Product Name: AmpDiVa VuMETRON-VOLI
- Manufacturer: Raites Engineering s.r.l.s.
- Power Supply: 5Vdc, 700mA, PTC self-recovery fuse
- Language: Friulano (Italian region Friuli)
- High Voltage: 200-300V for Magic Eye electron tube
- Country of Origin: Italy
- Contact Email: raites@studio-rts-ing-rampin.it
Product Usage Instructions
Power Supply:
The product requires a 5Vdc power supply drawing approximately 700mA. Ensure the power supply is not overloaded and is equipped with a PTC self-recovery fuse for short-circuit protection.
Safety Precautions:
Avoid using the product in humid environments or close to flammable substances. Do not operate in explosive atmospheres. Do not open, disassemble, or remove cabinet cover panels as high voltage electrodes may become accessible.
Do not use the product if the glass is broken. Properly dispose of the unit following local recycling laws at appropriate collection centers at the end of its life cycle.
Electromagnetic Compliance:
As a prototype for evaluation, this unit may not be approved by regulatory bodies for resale and could potentially interfere with radio communications. To mitigate interference, keep the unit away from radio systems.
FAQ
Q: Can I replace the power supply with a different voltage?
A: It is recommended to use the specified 5Vdc power supply to ensure safe operation and performance.
Q: What should I do if the unit malfunctions?
A: In case of malfunction, contact the manufacturer’s support team at raites @studio-rts-ing-rampin.it for assistance.
Raites Engineering s.r.l.s. v.le Rimembranza S.Giovanni 34 33072 Casarsa della
Delizia – PN ITALY
All Rights Reserved – © 2023
raites@studio-rts-ing-rampin.it
Magic Eye Envinronmental Vu-Meter.
The Magic Eye is an electron tube developed during the thirties of the ‘900.
Thanks to a small fluorescent screen, it allows the viewing of an electrical
quantity replacing the moving needle of an electromechanical instrument. It’s
a real electrostatic deflection Cathode Ray Tube similar to those used on the
oscilloscopes, even if in a minimal simplified version with one single
deflection plate and without the electrons beam focusing electrodes.
The tube used on the VuMETRON-VOLI(1) is a VT-138 (aka 1629) manufactured by
RCA and Silvanya; it comprises an amplifing triode with its anode directly
controlling the deflection electrode.
(1) “Voli” means “eye” in Friulano, the language spoken in the italian region Friuli
The circuit that turns on the unit is powered by 5Vdc from a common USB mobile
phone charger; a DC/DC switching converter steps up this voltage to 12V for
the tube heater and by a diodes doubler to approx. 200V for the triode anode
and the fluorescent screen.
The 12V voltage is used also to power a multiple feedback band-pass (100Hz to
10KHz) amplifier that apply a x1000 gain to the signal coming from the
environmental microphone.
The audio signal from the amp output is fed to a diodes voltage doubler that
clamps to GND the positive peaks of the signal and then filtered by a low-pass
integrator to obtain the audio signal envelope with negative values suitable
to control the triode grid.
The 5Vdc power supply requires approx. 700mA and is short-circuit protected by a PTC self-recovery fuse.
DISCLAIMER NOTICE
ELECTROMAGNETIC COMPLIANCE
This electronic unit is a prototype for evaluation purposes.
The user recognizes this evaluation prototype is not FCC or other Regulatory
Bodies approved for resale and in some circumstances can produce interference
to radio communications.
The user can avoid this interference moving away the unit from the involved
radio system.
DANGER – HIGH VOLTAGE
This electronic unit uses 200..300V to power the Magic Eye electron tube. Do
not open, dissasemble, remove the cabinet cover panels.
Do not use in humid envinronments, close to flammable soubstances or in
explosive atmosphere !
DO NOT USE IN CASE OF BROKEN GLASS.
Inner high voltage electrodes became accessible !
End of Life Disposal
Dispose the unit according the local laws about the recycling of electronic
equipments by taking it to the appropriate collection centers.
The VuMETRON-VOLI is designed, assembled and tested in Italy.
Raites Engineering s.r.l.s. v.le Rimembranza S.Giovanni 34 33072 Casarsa della
Delizia – PN ITALY
raites@studio-rts-ing-rampin.it
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