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Valve Gallery -
Tuning Indicators (3)
Valves: EM80,
EM81,EM84, DM70.
 
| Shown above is a EM80 tuning indicator from
Mullard. This was developed in the 1950s, two "curtains"
would form in the semi-circular topped area seen above as as signal was
tuned in. Approx 75mm height with 6.3v heater and B9A base. |
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Shown above is a Mullard EM81. Not wildly
different from the EM80 left, but including it gives the opportunity to
include a side view. Approx 75mm height with 6.3v heater and B9A
base. |
 
| Shown above is a Mullard EM84, uses during the
latter half of the 1950s. Here a phosphorescent strip glows along
the white area clearly seen above depending on signal strength.
Height of 82mm with B9A base. |
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Shown above is a Mullard DM70. Extremely
small tuning indicator, where signal strength is indicated by the length
of green line in the exclamation mark. Used from the late 1950s
onwards, approx height of 47mm with .. base. |
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Tetrodes and Pentodes gallery page
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