Tube EM 84 or Röhre EM84 ID413, Mag. bar tuning indicator, Noval, 9 pin miniature (USA pico-9) B9A and Indication shown. Radio tubes are valves.

The EM84 tuning indicator, or magic eye, was used to display the optimum tuning point of a receiver, or the recording level of a tape recorder. The main benefit in reception was for FM radio where the exact tuning point was harder to determine than for AM.

EM84 page sheet date 1 1 1959.04.04 2 1 1962.05.05 3 2 1959.04.04 4 2 1962.05.05 5 A 1958.07.07 6 FP 2005.05.06

2010年3月3日 · Looking at the data sheets it looks like the EM87 may be more sensitive since it's grid voltage is specified as -15max vs -22max for the EM84. The EM84 also has a lower Anode Current and dissipation but it is close.

EM-84 Tuning Indicator -magic eye- NOS mostly RFT (Eastern Germany), white boxed from industrial bulk pack (see pictures) (aka 6FG6 /…

In the EM84 the quiescent condition was two green bars, one at each end of the window. As the signal strength increased the bars would elongate and eventually overlap to form a bright green region. The optimum point for tuning was a minimum gap. The cathode is on the right.

Title: EM84 Author: La Radiotechnique Subject: SM-FP-2003-08 Created Date: 8/25/2003 1:02:01 AM

→ Informationen zum Sockel: Noval, 9pol. → Liste aller Röhren mit: Noval, 9pol. Hinweis: Beachten Sie bitte das bei der Benennung und Zählreihenfolge der Stifte, in der Literatur oder Datenblätter, je nach Hersteller teilweise unterschiedliche Angaben gemacht werden.

Title: EM84 Author: Tesla Subject: JHl-VC-FP-2012-05-12 Created Date: 5/12/2012 1:26:48 PM

The 6FG6, 6E3p¤, EM84, EM840, and CV5434 are exact substitutes. The 6HU6, EM87, and CV10407 are exact substitutes. The 6FG6 and 6HU6 along with their substitutes may be interchanged, however the 6FG6 has less sensitivity, and requires slightly less filament current. I've used the 84 and 84A interchangably in my consoles with no apparent problems.