You'll stay out because I dislike your attitude - so the Ignore button gets used once again.
I have to break my promiss to stay out of this thread...but for a good reason.
A link to an amplifier of which wiseoldtech wrote that he designed and built it himself:
Amplifier wiseoldtech
Note the two 0.1 uF capacitors parallel to the two 100 uF capacitors in the power supply. Those 0.1 uF capacitors are not present in the original Magnavox 93-series so they must have been designed in by wiseoldtech.
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PFL200. Have you learned anything new the past 19 years? Yes? Just maybe he did too? That build was from 2003.
Yes, I did.
wiseoldtech presented his amplifier here on diyAudio last year August, so in his own words (!) he was at least spreading nonsense dreamed up by compulsive non-techs across the internet less than a year ago.
wiseoldtech writes about himself as being a certified professional repairman for 45 years.
wiseoldtech presented his amplifier here on diyAudio last year August, so in his own words (!) he was at least spreading nonsense dreamed up by compulsive non-techs across the internet less than a year ago.
wiseoldtech writes about himself as being a certified professional repairman for 45 years.
Logic dictates that he himself in 2021, in his own words (!), spread "nonsense dreamed up by compulsive non-techs" on the internet. Probably not intentional, but he did nonetheless. He suggested his design to a forum member who was looking for recommendations for PP EL84 circuits.
Logic also dictates that wiseoldtech in 2003, in his own words (!), was following "nonsense dreamed up by compulsive non-techs", while claiming to be a certified professional repairman for 26 years at the time.
It is not my intention to get into an argument with you at all so I'll leave it at this. If there's something wiseoldtech is good at, it's provoking. Probably I get provoked too easy.
Logic also dictates that wiseoldtech in 2003, in his own words (!), was following "nonsense dreamed up by compulsive non-techs", while claiming to be a certified professional repairman for 26 years at the time.
It is not my intention to get into an argument with you at all so I'll leave it at this. If there's something wiseoldtech is good at, it's provoking. Probably I get provoked too easy.
Yes, it's a VACUUM TUBE amp.
It uses TUBES, and as I previously mentioned, tube equipment, having higher impedances in their designs are prone to instability.
Thus to stem any indesirable effcts in operation, the small-value parallel caps are sometimes needed.
HOWEVER......
Since THIS thread was started and is about SOLID STATE equipment, which is low-impedence equipment, why is the subject of my TUBE amp even relevant or even mentioned at all here?
Because these two TYPES of amps are way different from each other, with different requirements.
The big caps in the power supply are there for supplying surge currents, instantaneous (or near enough) power delivery to the load. Smaller caps next to the output transistors are decoupling capacitors - to stop local supply noise causing upsets.
The ESR of the big caps is low by their very nature anyway. Some claim paralleling helps reduce that, but when you're talking crazy values like 10,000uF there's really little to be gained... and you're more risking rectifier failure.
The ESR of the big caps is low by their very nature anyway. Some claim paralleling helps reduce that, but when you're talking crazy values like 10,000uF there's really little to be gained... and you're more risking rectifier failure.
Wow.. fairly combative? A believer in multiple paralleled caps then ..Ok.
Everybody has their own world views.
So build Your stuff that way.. a simple inoffensive solution.
Combative, and fairly annoying.
He's trying to compare solid state and its known issues with vacuum tube equipment.
Two totally different designs, with different requirements.
And still no explanation whatsoever. Only things like: "Those two caps are not for filtering, they're plate isolation / coupling, not power supply.", "...having higher impedances in their designs..." and "...and its known issues with vacuum tube equipment.".
Just look at the position of the first 0.1 uF capacitor in the amplifier of wiseoldtech. So that one is there for 'plate isolation' and 'stability reasons'? Yeah right.
Combative? Yes, when provoked by somebody like wiseoldtech. But at least I use valid arguments in my battles, while wiseoldtech leaves a trail of fallacies, ad hominems, etc..
Adcom GFA 555 amplifier testing
An ODD tonearm design
Just look at the position of the first 0.1 uF capacitor in the amplifier of wiseoldtech. So that one is there for 'plate isolation' and 'stability reasons'? Yeah right.
Combative? Yes, when provoked by somebody like wiseoldtech. But at least I use valid arguments in my battles, while wiseoldtech leaves a trail of fallacies, ad hominems, etc..
Adcom GFA 555 amplifier testing
An ODD tonearm design
Where did I write that than? I just don't know. Untill recently I thought that paralleling caps couldn't harm either so I did, but since posts #10 and #15 by Elvee I'm not so sure about that anymore.
