• Country
• United States of America (USA)

• Manufacturer / Brand
• McMurdo Silver Co., Inc.(post WW2); Hartford

• Year
• 1946 ?

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 189630

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 4

• Valves / Tubes
• 6AL5 6SN7GT 6SN7GT 5Y3GT

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 105-125 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: VTVM Vomax - McMurdo Silver Co., Inc.post

• Shape
• Tablemodel, with any shape - general.

• Notes
• Vacuum Tube Voltmeter.
  
  DC volts 3, 12, 30, 120, 300 and 1200 volts at 51 Megohms constant input resistance (at Vx2.5 and COM/GND jacks. Same ranges in reverse polarity (shift FUNCTION knob).
  
  DC volts 7.5, 30, 75, 300, 750 and 3000 volts at 126 Megohms constant input resistance. Same ranges in reverse polarity (shift FUNCTION knob).
  
  AC volts 3, 12, 30, 120, 300 and 1200 volts at 6.6 Megohms shunted by 50 pF. Diode probe must be plugged into panel socket.
  
  RF volts same as for AC, but 6.6 Megohms shunted by 8 pF. Diode probe withdrawn from socket to access test point.
  
  Decibels: 3 ranges (for 0 dB = 1 mW in 600 Ohms):
  -10 to +10 dB;
  +10 to +30 dB;
  +30 to +50 dB
  
  Current: 6 ranges of 1.2, 30, 120, 300, 1200 mA and 12 A.
  
  Ohms: 6 DC Ohm ranges (all zero left) of 2, 20, 200 kOhms and 2, 20, 2000 Megohms.

• Mentioned in
• Funk-Technik (FT) (8/48 Seite 183)

• Literature/Schematics (1)
• Beitman Radio Diagrams, Vol. 07, 1947 (p.76)

• Author
• Model page created by Egon Strampe. See "Data change" for further contributors.

• Other Models

• Here you find 15 models, 8 with images and 6 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from McMurdo Silver Co., Inc.(post WW2); Hartford