HL 42 DD
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BrandMazda / Ediswan
ClassDouble Diode Triode
BaseMazda Octal
Filament4V @ 650mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsDouble Diode Triode
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage250 V
Audio Performance
Key Features
- Indirectly heated
- Variable gain characteristics
- Common cathode sleeve
- Screened diode section
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Rating Condition | 100V | 2900 | 8000 | 23 | - |
| Typical Operation (50k Load) | 250V | - | - | 17.5 | 2.8mA |
| Typical Operation (100k Load) | 250V | - | - | 18.5 | 1.75mA |
| Variable Gain (approx. -20V bias) | - | - | - | 2.7 | - |
Application Notes
Particularly suitable for use in all-wave receivers where it is desired to improve inadequate A.V.C. characteristics with low delay voltages. May also be employed as a variable gain L.F. valve for manual volume control.
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