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Post by bluegrassdan on Jan 7, 2024 13:58:21 GMT -6
Howdy, friends.
i’ve been busy and scarce from the forum for a while. My apologies. But I wanted to share a sample of something I’ve been cooking up.
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Post by kcatthedog on Jan 7, 2024 14:56:06 GMT -6
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Post by klangfarben on Jan 10, 2024 14:06:44 GMT -6
This looks fantastic!
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Post by Quint on Jan 10, 2024 14:46:54 GMT -6
Howdy, friends. i’ve been busy and scarce from the forum for a while. My apologies. But I wanted to share a sample of something I’ve been cooking up. Interesting. I look forward to hearing more. Also, sometime back in the late 60s/early 70s, my dad found himself in a men's room, standing at a urinal, when Little Jimmy Dickens, who was shithouse drunk, walked in and up to the adjacent urinal, and proceeded to piss all over my dad's boots. My dad used to always tell that story with such anger. |
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Post by drumsound on Jan 11, 2024 0:06:26 GMT -6
Nice work, Professor.
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Post by drsax on Jan 12, 2024 21:15:22 GMT -6
Very nice!!!!
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Post by audiospecific on Jan 15, 2024 5:56:16 GMT -6
Howdy, friends. i’ve been busy and scarce from the forum for a while. My apologies. But I wanted to share a sample of something I’ve been cooking up.
Nice. I like your resistor choices. Never been a big fan of wima caps in tube builds, but ok.
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Post by bluegrassdan on Jan 17, 2024 23:20:48 GMT -6
Nice. I like your resistor choices. Never been a big fan of wima caps in tube builds, but ok.
Any particular reason for not preferring Wima caps? |
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Post by audiospecific on Jan 18, 2024 8:03:00 GMT -6
Nice. I like your resistor choices. Never been a big fan of wima caps in tube builds, but ok.
Any particular reason for not preferring Wima caps?
I haven't found any that don't suffer from the effects of mono stacked construction. There are two ways to construct these box style capacitors. The mono stacked construction way layers with parallel connected plates that corona discharges happen internally that lends a hazy sound to it. The series wrapped construction distributes the voltage potential across layers so it never suffers from this corona effect. This is what you have to look out for when you use box style film packages with high voltage. The ones I tried failed miserably. So I only use theirs in low voltage circuits.
CMF vishay/dale resistors are my general resistors I use. Except for the cathode and grid stops, screen bias and power supply dropping resistors which I like to use Vishay/mills MRA resistors.
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Post by spacecowboy on Jan 18, 2024 8:44:17 GMT -6
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Post by nick8801 on Jan 18, 2024 9:04:07 GMT -6
Love this Dan....The eq sounds really perfect in that demo!
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Post by audiospecific on Jan 18, 2024 10:38:53 GMT -6
The real test is a 1 month burn in with signal.
For the people that are serious about what I said earlier, I found a capacitor company that wrote a white paper about that subject that I known for years.
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Post by spacecowboy on Jan 18, 2024 13:25:14 GMT -6
if the caps were being used for mains AC filtering you might have a point but you'd still be talking gibberish when you say "hazy". reduction in capacitance described in that paper wouldn't cause "haze" it would cause the EQ values to drift. meanwhile back in here reality where everyone else lives these caps are being used at extremely low AC voltages so this is irrelevant. quit cluttering up the forum criticizing things you have absolutely zero knowledge about.
dan i'm sorry for derailing your thread. your design looks and sounds great.
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Post by drbill on Jan 18, 2024 13:37:04 GMT -6
Where's the popcorn at?  |
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Post by okcrecording on Jan 18, 2024 14:52:19 GMT -6
Fantastic Dan, love the stepped inputs as well.
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Post by bluegrassdan on Jan 18, 2024 19:35:55 GMT -6
That paper, which is far from a scientific peer-reviewed article, seems to be talking about high AC voltage in power inverters, which can cause premature deterioration of the capacitor.
All I know is these Wima caps don't sound "hazy" to me. And I've swapped out many types in this circuit ranging from NOS paper-in-oil to film and foil, ceramics, and mica.
Nevertheless, I'm always willing to learn something new, which is why I was curious about your reasoning. Thanks.
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Post by audiospecific on Jan 18, 2024 19:54:40 GMT -6
That paper, which is far from a scientific peer-reviewed article, seems to be talking about high AC voltage in power inverters, which can cause premature deterioration of the capacitor. All I know is these Wima caps don't sound "hazy" to me. And I've swapped out many types in this circuit ranging from NOS paper-in-oil to film and foil, ceramics, and mica. Nevertheless, I'm always willing to learn something new, which is why I was curious about your reasoning. Thanks.
Its nice you haven't had the issues integrating them as I have in tube gear. For me, the sound great at first, then after a while they deteriorate after burning them in. Maybe I got a bad or counterfeit capacitor kit. I'll buy a sample kit of them from a parts distributor instead of Amazon and try them out again. Because it doesn't make sense others don't have issues like this.
Btw, I discount peer reviewed articles first. Especially about electronics where a lot of things are not scientific law.
Looking at the specification page, it looks like they do that for the 400 and 600 V and the ones that came in my kit are the 250V. So I will try out the higher voltage versions.
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