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Tube Database (7,341 tube types · 1,270 archive entries)

Other (3,257 tube types), Pre (2,314 tube types), Power (1,030 tube types), Rectifier (740 tube types)
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Tube-number record

INDICATOR TUBE

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ClassIndicator Tube
BaseCRT / special base

Construction

Primary TypeOther / special
EnvelopeGlass

Filament / Heater

Absolute Maximum Ratings

Audio Performance

Key Features
  • No filter coating
  • Blue absorbing filter recommended
  • Circular polarized amber filter recommended

Application Notes

The type ZM1023 is electrically identical with type ZM1021 but has no filter coating. The use of a separate blue absorbing e.g. circular polarized amber filter is recommended.

Filters

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Manufacturers

Brands

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