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- Pentode or Triode mode? - The Gear Page
Triode mode typically has less output tube distortion, and the output tube distortion that remains has a different quality There are fewer upper, odd harmonics contributed by the output tubes, and that can make Triode mode sound either "smoother" or "darker" than Pentode mode Your DSL40C has master volume, multiple channels gain controls
- Pentode vs. Triode - The Gear Page
Looking for a good explanation explaining the difference between these two modes I understand the wattage reduction, but what else happens to the signal (eq, overdrive, etc ) when an amp is flipped between the two? Thanks for any info
- 6V6 Cathode Follower as linestage buffer - The Gear Page
Triode mode will give a lower output impedance from the 6V6 due to lower internal plate resistance (even though it's being used as a cathode follower; performance will be better than relying on feedback to make everything work) But triode mode also yields less power output compared to pentode mode, whatever tube you use
- Cathode follower - The Gear Page
The cathode follower triode will pass some amount of idle current, and this has to be pulled through the large-value resistor between the cathode ground A 12AX7 might pass 1-2mA at idle in typical applications, and if the cathode resistor is 100kΩ then the cathode voltage must be:
- Preamp tubes and gain stages -- how does it work? - The Gear Page
2 tubes - 4 triodes - can produce a huge amount of gain Some amps have more stages for various reasons, like multiple cathode followers (which, by definition, can’t increase the gain) or because they dump signal - for example, in a lossy tone stack or to send to FX loop - and then need another triode to make it back up, or because they have multiple channels (ie, not all preamp tubes are
- Triode vs Pentode mode? - The Gear Page
Triode mode on a pentode sounds thicker, mushier, less articulate Some people think it sounds more bluesy; I think it just sounds sloppy, like the difference between sober and drunk Click to expand That was a very good explanation Also, the pentode tube is not really a triode connected this way, we just call it that
- whos got parallel triode amps - matchless etc? - The Gear Page
what are thoughts around parallel triodes in the input stages a la Matchless etc? obviously sacrificing voltage gain for an immediate current bump, but what about tone effects? like it, hate it? I'm plotting options for a 2 channel amp with very different tones for a friend and thinking about
- SRPP pentode wiring for 12AX7? - The Gear Page
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 The resistor Rk2 'senses' the load impedance of the following stage If the load impedance suddenly falls (a very loud transient note
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