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pentode    
n. 五极真空管

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  • SRPP pentode wiring for 12AX7? - The Gear Page
    This design is a good way to get pentode characteristics from your 12AX7 preamp The circuit uses two the triodes of a 12AX7 for example Each triode is biased the same, so half the HT is dropped across each one The lower triode acts as a gain stage with an active load, and the upper triode acts as a cathode follower with an active load
  • Pentode vs. Triode - The Gear Page
    pentode = 5 active elements (cathode, control grid, screen grid, suppressor grid, plate) with LOW interelectrode capacitance (think: RF operation); high gain (mu) and high dynamic resistance (rp); operates as a voltage-controlled, constant current output device; almost always operates with 1 5-1 10th of rp loading Click to expand
  • Calculating pentode preamp tube bias - The Gear Page
    What's the voltage on the screen? This matters more than the voltage on the plate with a pentode Increasing the screen resistor from 1M will drop more volts there resulting in lower voltage on the screen and lower plate current Low plate voltage works in the input tube because you don't need to swing much
  • Pentode Triode switch - The Gear Page
    Does having a pentode triode switch on the power section of an amp really half the wattage? depends on the amp my juke warbler sounds great in triode mode other amps, not so much warmer looser spongier somehow, the juke doesn’t sound muddy or dull in triode like some amps really nice
  • Goodsell nixing pentode triode - The Gear Page
    I've been thinking about a higher end amp I mainly play at home and I've been back and forth between the Suhr Badger and the Super 17 (I haven't played either yet, that will take some road tripping from where I live ) The Mark IV has eliminated the 5 watt switch Those of you with Mark iii's
  • Divided by 13s 5879 preamps - The Gear Page
    I consider these completely defunct If you want a pentode first stage use something like a 6GH8A tube Its a pentode with a triode inside You can run the pentode with a 500k plate resistor and use the triode section as a cathode follower if you like That'll give you some gain with low output impedance
  • Triode vs Pentode mode? - The Gear Page
    The pentode setting sounds more like a miniature Blackface Twin and the triode setting sounds similar to a Tweed Deluxe that only goes up to "8" instead of up to "12" The tone controls work so well that you can get a wide variety of great sounds with either setting
  • Amp buzz in pentode mode but not triode mode? - The Gear Page
    My Hiwatt DC40 has a buzzing noise in pentode ("full volume") mode, but the noise is not present in triode ("half volume") mode What could be causing this?
  • 6V6 Cathode Follower as linestage buffer - The Gear Page
    To make a pentode cathode follower you need to make the screen to cathode voltage constant even in the presence of signal The simplest and most common way to do that is to use a larger resistor between B+ and screen and a capacitor between screen and cathode The RC time constant needs to be big enough to decouple at low frequencies
  • Triode Mode Hum - The Gear Page
    In Pentode mode, ripple at the screen is a significant place hum could be injected, because the screens are not common-mode: input at the screen becomes an output at the plate, so screen-ripple adds hum to the push-pull audio





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