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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Updating & Refining the " DCR " Topic posted by drlowmu on March 7, 2007 at 12:10:47:
I would have to disagree with the rectifier not mattering. It is fairly easy to see that the dynamic impedance of the power supply is much higher with normal tube rectifiers, and even damper diodes. Mercury vapor and solid state rectifiers have much lower forward conduction impedances. In simulations with PSUD II, I have found it easy to get down to around 65 ohms with mercury vapor or solid state rectifiers. However, I can't seem to find a combination to get normal tube rectifiers below about 280 ohms of dynamic impedance. To get the dynamic impedance of the power supply I do a current step of +20% and divide the voltage change by the current step amount.Now, 280 ohms is not bad considering most choke input supplies have impedances around 400 ohms. Let's put everything into perspective with a typical 300B amplifier. The normal 300B will have a plate resistance of about 800 ohms. Now, which power supply do you think will allow the 300B to sing along with the music more freely, the 400 ohm choke input supply, the 280 ohm low DCR supply with normal tube rectifiers, or the 65 ohm low DCR mercury/solid state rectified power supply?
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Follow Ups
- "The rectifier doesn't matter at all" - JLH 03/8/0704:26:28 03/8/07 (1)
- Re: "The rectifier doesn't matter at all" - drlowmu 07:02:35 03/8/07 (0)
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