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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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In Reply to: RE: Budget speakers to pair with SET amp posted by Whats-a-vacuum-toob? on September 17, 2021 at 05:11:46:
There are two resistances to consider - the source impedance and the intended load (speaker) impedance. Most amps are designed around 4, 8, and/or 16 ohm loads, but the source impedance depends on the actual design. The ratio of load impedance to source impedance is the damping factor, and most modern speakers assume it to be very large but it's usually around 3 with SETs. That's why you want a speaker whose impedance does not drop much below the nominal value.
Your tube seems to be a beam tetrode, not a true triode. If the second grid is tied to the plate (usually with a resistor around 100 ohms) then it's a simulated triode circuit. But sometime you'll see a pentode/tetrode design with feedback, or even a screen-driven output stage, especially with high-perveance tetrodes such as you have.
You can measure the output impedance by feeding the amp a sine wave signal and measuring the output voltage unloaded and loaded with a speaker-size resistor. (If you don't have an oscillator, you can download a signal-generator app for a smartphone)
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Follow Ups
- RE: Budget speakers to pair with SET amp - Paul Joppa 09/17/2108:24:30 09/17/21 (5)
- RE: Budget speakers to pair with SET amp - Whats-a-vacuum-toob? 11:48:16 09/17/21 (4)
- RE: Budget speakers to pair with SET amp - Whats-a-vacuum-toob? 08:08:50 09/25/21 (1)
- Thanks! - Paul Joppa 08:38:56 09/29/21 (0)
- RE: Budget speakers to pair with SET amp - Whats-a-vacuum-toob? 16:21:31 09/20/21 (0)
- RE: Budget speakers to pair with SET amp - Paul Joppa 17:44:29 09/17/21 (0)
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