Starved plate tube means that the plate voltage is below typical datasheet values.
Here are couple of examples:
https://www.diyaudio.com/community/threads/semi-starved-plate-tube-dilemma.343527/post-5934447
Here are couple of examples:
https://www.diyaudio.com/community/threads/semi-starved-plate-tube-dilemma.343527/post-5934447
I have seen the terms "starved tube" or "starved plate" applied to both lower than typical voltage operation and / or lower than typical current operation. These are often used when high voltage is not available, or a specific type of distortion is desired.
Many guitar amps feature a "cold clipper" stage which is a typical 12AX7 triode with its cathode resistor increased by a factor of 10X or more. Zero or minimal bypassing is used across the resistor. Many popular guitar amps use a 39K cathode resistor with no bypass cap. I have found some neat sounding distortion by running a pentode in the same manner and messing with both the cathode and screen grid resistors.
Many guitar amps feature a "cold clipper" stage which is a typical 12AX7 triode with its cathode resistor increased by a factor of 10X or more. Zero or minimal bypassing is used across the resistor. Many popular guitar amps use a 39K cathode resistor with no bypass cap. I have found some neat sounding distortion by running a pentode in the same manner and messing with both the cathode and screen grid resistors.
There is also "starved filament" use on some tubes where the heater voltage is quite a bit lower than spec. I think Steve Bench posted data for some tubes with starved filaments.
More "starved" than zero Va isn't possible, and yet can be useful:
https://www.radiomuseum.org/forum/tubes_operating_without_anode_supply.html
Long ago the major use was the starved pentode. It worked on the fact that the product S*(Ri par Rload) had a maximum at very low Ia so the voltage gain of a single pentode could be over 70 dB. This was more than high enough to compensate for the decreased Bw, via NFB IOW it could result in a simpler and cheaper design without sacrificing performance.
https://www.radiomuseum.org/forum/tubes_operating_without_anode_supply.html
Long ago the major use was the starved pentode. It worked on the fact that the product S*(Ri par Rload) had a maximum at very low Ia so the voltage gain of a single pentode could be over 70 dB. This was more than high enough to compensate for the decreased Bw, via NFB IOW it could result in a simpler and cheaper design without sacrificing performance.
Seems that people have experimented with that on the 4P1L to reduce microphonics among other things. It also reduces the tube lifespan significantly.
Be a interesting thread only seen it with musical instrument products.
Tube Works or BK Butler did Tube Driver distortion 12 volts I believe Heater and plate.
Been others in 30 to 60 volt range for typical 12Axx family
Tube Works or BK Butler did Tube Driver distortion 12 volts I believe Heater and plate.
Been others in 30 to 60 volt range for typical 12Axx family
The classic example is the Mullard 3W SE amp using starvation operating conditions. It appears https://www.diyaudio.com/community/threads/mullard-three-watt-amplifier-future-build.387802/
Due it´s simplicity this amp saw enormous use in UK record players of the early 1960´s and was very reliable.
Bench BAron
Due it´s simplicity this amp saw enormous use in UK record players of the early 1960´s and was very reliable.
Bench BAron