TF6 Storage or Dry Batteries

Thermiodyne Radio Corp., Plattsburgh NY. (ex Capital Phonolier, Potter-Shepard) later Algonquin Electric Co.

Daten
Forum
Bilder
Sammlungen

  • Jahr
  • 1925
  • Kategorie
  • Rundfunkempfänger (Radio - oder Tuner nach WW2)
  • Radiomuseum.org ID
  • 63321

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 Technische Daten

  • Anzahl Röhren
  • 6
  • Hauptprinzip
  • Geradeaus ohne Rückkopplung
  • Wellenbereiche
  • Mittelwelle, keine anderen.
  • Betriebsart / Volt
  • Akku und/oder Batterie / A: 6 V & B det: 22.5 V & B+: 45 V or 90 Volt
  • Lautsprecher
  • - Dieses Modell benötigt externe(n) Lautsprecher.
  • Material
  • Gerät mit Holzgehäuse
  • von Radiomuseum.org
  • Modell: TF6 [Storage or Dry Batteries] - Thermiodyne Radio Corp.,
  • Form
  • Tischgerät-gross, - Querformat (breiter als hoch oder quadratisch).
  • Abmessungen (BHT)
  • 29.5 x 11.5 x 13 inch / 749 x 292 x 330 mm
  • Bemerkung

  • One dial (primary tuning control knob)

    Radio Collector's Guide 1921-1932 lists two TF6 models: one uses storage or dry batteries, TF6 [Storage or Dry Batteries] and the other uses storage batteries only, TF6 [Storage Batteries only].

    See Professor Serioja Tatu's Test Bench Measurements of this radio here. 

  • Nettogewicht
  • 40 lb 0 oz (40 lb) / 18.160 kg
  • Originalpreis
  • 140.00 USD
  • Datenherkunft extern
  • Ernst Erb

 Sammlungen | Museen | Literatur

Sammlungen

Das Modell befindet sich in den Sammlungen folgender Mitglieder.

 Forum

Forumsbeiträge zum Modell: Thermiodyne Radio: TF6

Threads: 1 | Posts: 1

Test bench measurements:

  1. Measured frequency band: 540 kHz – 1114 kHz, perfectly aligned with the dial indications. This covers the 550 kHz -1100 kHz declared by the manufacturer, 100 years after its tuning in the factory. Tuning from a station to another is very easy using only the central main tuning. Minimum adjustments are required from the 4 capacitors in parallel with the main tuning.
  2. Receiver sensitivity is around - 60 dBm with a good signal to noise ratio, measured with Rohde & Schwarz SM300 signal generator connected at long antenna connector with a proper impedance adapter; signals at -70 dBm still detectable. Noise level is -75 dBm, compared to the best Atwater Kent model 20 receivers. The same sensitivity is observed over the entire BC band. At the minimum volume, the sensitivity is – 15 dBm, at the max around – 60 dBm.
  3. The AF signal has been captured at the speaker output (1 kHz tone demodulated, as measured). Litle distortions are observed, as seen in the test bench measurements picture. Detector rheostat is around 15 degrees right to the middle (1 o’clock) for the best detection (signal close as much as possible to a sinusoidal one).
  4. If the radio starts oscillating in AF (hundreds of Hz) a good idea is to move the external speaker away or to reduce the B+ voltage (for example from 90 V to 45V), to reduce the overall gain. This audio oscillations or humm can occur because of the high gain of the radio and of the mechanical vibrations of the tubes due to speaker.
  5. The measured DC current in A battery is between 1.1 A - 1.66 A (6 x 0.25A = 1.5 A) with both rheostats (volume and detector) at minimum and maximum values respectively. The measured voltage at the heater (cathode) is between 3.8 V and 6 V in the same conditions. Therefore, the radio must be tuned to operate at the minimum DC current, as close as possible to minimum volume to economise the A battery. Both rheostats can be turned OFF.

Alan Larsen, 02.Oct.24

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