EM84 Tuning Indicator (Magic Eye) Ei Pair (2 Tubes)
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.
Sensibly equivalent to: 6E3P, 6FG6, CV5434
Can be used with DIY Boards such as:
ebay.com/itm/Magic-Eye-6E2-EM87-6UH6-EM84-Tube-Audio-Indicator-Low-Level-Input-DIY-Board-/331876232557?hash=item4d455d6d6d:g:nDoAAOSw9eVXV~Cx
This valve is in a standard thin glass tube envelope with a phosphor strip on the inside of the glass. The electrode structure is based on a double triode with common cathode. The anode of the second triode is called the target and within the electron stream is a deflector electrode designed to alter the path of the electron beam, it would normally be connected to the anode. 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.
No Returns; Will exchange defective tubes free of charge for 60 Days
Factors which can shorten tube life include inadequate ventilation, overdriving loudspeakers at continuously high volume levels, severely fluctuating A.C. line conditions (e.g. sagging line voltage during summer peaks of air-conditioning demand), or severe interference pulses or electromagnetic interference.
U.S.A. $3.00 (USPS Air Mail)
International $15.00 (USPS Air Mail)