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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: High gain appears to be a problem with this preamp posted by Frihed89 on October 29, 2014 at 04:09:49:
People with sensitive speakers hear a lot of noise.>>
The mu of the 4P1L is only 10. That's pretty low for a small tube, though higher than most DHTs. So more likely to be the ratio of signal to noise, which is stated at 88db and that's respectable, so may be anecdotal.
The circuit has 150v (0D3) on the top of the plate resistor of the 4P1L and LEDs in the cathode. The filaments use an L200C regulator. Capacitor output. That's what I see from the specs.
I don't know if people with sensitive speakers are having problems with microphonics rather than noise. The tube is microphonic, so needs special treatment to dampen the potential for vibration (like a massive chassis or some rubber-ish decoupling) and starving the filaments helps too.
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- It's not a high gain tube - andy evans 07:57:00 10/29/14 (0)
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