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Aragon 47k Phono Preamp! Modding a 47k with Audio Note & Z-foil resistors and capacitor upgrades!
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- čas přidán 4. 01. 2023
- ~ Help me stay caffeinated! www.buymeacoff...
The venerable Aragon 47k w/IPS & or Acurus P10 Phono Preamp. Details and easy mods to bring out the most from your vinyl collection. I add new resistors and capacitors by Vishay, Audio Note, and Auri XO Caps!
Mods:
IPS Power Supply
Recap with 2x CDM381LX 4700UF/63V & 6x Panasonic FM 1000uf 35V
Main unit:
Recap with 2x 3300uf/63V caps with CDM381LX 3300uf/63V
Replace 2x 10uf output caps with 10uf/160V Auri cap XO capacitors (really best option)
Optional: add under-board 2 x Solen Film Foil 0.01 bypass caps to Auri XOs
Replace 2x 16v 470 uf NP cap with Nichicon ES Muse NP same value.
Replace 6x 1000uf/25V caps on main board with Audio Note Standard Foil 2000uf/25V
Replace 2x Dale input resistor with Vishay Zfoils
Replace final output resistor with 2x Audio Note 47R 0.5watt Non-magnetic Tantalum. (AMRG or TAKMAN carbon film might work very well also).
Results= Incredible sound!
Excellent Circuit
Awesome, thanks for posting! Exciting stuff. I have a full Aragon stack here, including a 47K, as well as a P10. It might be fun to mod the P10 and compare it to a stock 47K.
Interesting circuit diagram. There is a wire between the gates of Q7 and Q8.
So glad I stumbled on this. Literally just bought a 47K and about to upgrade it.
Do you have a link to where you bought all of those resistors and caps you bought?
Also, what made you go with the AN .5W non-magnetic copper tantalum resistor instead of their silver version?
Thanks!
Yes! I will post links and details in the next 48 hours. Stay tuned!
Are you sure its tantalum? thats usually a material for caps, I think more worthwhile improvements would be made by modifing the circuit, especially power supply-I assume its built to the typically low spec most modern audio companies do with LM317 regulators.
@@hificonspiracy You would also better the circuit quality by cooling the input differential stage transistors using a Peltier element, this lowers thermal noise, trick is how to thermally couple all 4 input transistors to a plate you can attach to the Peltier element, this may take it to a different level as the 3.5mV or so from the cartridge needs to be as cleanly amplified as possible.
@@engjds Yep. Tantalum metal film.
@@engjds Most of the in-series resistors are only 25 or so ohms so I don't think thermal noise is going to be big issue. IMHO. It's super quiet.
Amazing upgrade, congratulations. What’s the total cost for this mood?
Hey we have the same LED lamp.. I think that you never addressed the most important degrading components and sources of noise THE TRANSISTORS!
The ubiquitous IKEA desk lamp! Sounds better then other brands 😉
I'd be surprised if changing low value resistors makes an audible difference.
Yes you would be surprised.............
Never heard of a tantalum resistor before. They're typically made of carbon, carbon film or metal film.
Yep Tantalum, and Niobium too
@@hificonspiracy Do they tend to fail prematurely like tantalum caps do? I find bad tantalum caps very often in guitar tube amps I've worked on.
@@ianaintsaying1625 I don't believe so. The AN non- magnetic Tantalums have been around since 2012 or so and have been used in some very demanding designs. Good stuff.
Shinkoh tantalum resistors are highly regarded. However, low value resistors probably don't make much difference.
@@acoustic61 Night and day diff. Clearly audible. I have two units one OEM the other modded. OEM sounds rather congested and less dynamic by comparison.
Having seen a few preamp circuits and a decent knowledge of electronics, I can tell you that Phono stage is pretty basic though neat PCB, )
A better circuit would use current mirrors in top and bottom legs of input differential amplifier stage (in place of R15 and R16), personnally I would be using a NE5x op amp after the differential amplifier stage in a sallen key configuration to get a well formed RIAA response, though this is debatable, some engineers would argue discrete better here.
I am interested what the power supply is, quite often they use LM317 regulators wired improperly for audio use, using 120/240R resisters instead of zener diodes on the adjustment terminal, you need to fudge those devices to make them regulate at audio frequencies properly.
It is a pretty basic circuit. I think that's the beauty of it though. Only what necessary. You should pick one up your be impressed with the sound. Sure, lots of thing could be added to make it measure better I would argue it would be inconsequential to the sound. I would fall into the camp against NE5x op amps. Honestly, I tare those out whenever I find them and do prefer discrete designs like the 47k. Persoally, I feel cheated when I see manufactures asking $2-4k for designs full of nothing NE5x opamps. You might be right about the power supply but as long as it provides a low impedance high ripple source which it seem to do I'll take it any day over a wallwart.Thanks for the feedback!
Discrete components can be better than OpAmp if an engineer knows how to suppress a noise. JFETs must be preselected carefully, and there are less and less p-channel JFETS on a market, so possible schematics are limited with FET cascode with all advantages and disadvantages. But MM preamp on FETs can be better than OpAmp relatively easy. As for MC BJTs beat JFETs, but an engineer must know how to negate a current noise and how to minimize a voltage noise. Fortunately THD is not an issue in case of so small input voltage. Even no negative feedback is not a problem. But that noise!... Man, that’s a headache.
As for LM317 it depends on a PSRR, because 317 is pretty noisy. Any shunting regulator for 317 won’t be a wasting of components.
@@sc0or I agree discrete can be better-though there are little tricks you can do to up the performance from op-amps to give them similar performance, circuits I have examined a few schematics, that use MOSFETs, was you using Jfet as a blanket term there?
Noise is an issue, I thought about Peltier temp regulation to tweek thermal noise, i am a bit suspicious of the quality of the circuit in this video, more transistors with incremental gains keepng the signal within the linear region is preferable to just a few with higher gains-though naturally this is a tradeoff with device noise.
I am a design engineer, but RIAA amplification is a new topic for me, so trying to work out the best DIY circuit to base mine on if you have ideas?
@@sc0or I was just looking at the old pioneer A400 RIAA stage, which looks superior to this expensive stage, A400 has current mirrors on the differential stage, ifferential pairs are temperature matched pairs too(single package), just goes to show, just because you are buying an expensive box, doesnt mean to say the circuit quality will be.
@@engjds Because the higher g or h the less noise a transistor generates (and a resistive noise will be the only concern).
It gets a bit scary when people call equipment from the 90's vintage....... I still class Vintage as being 40's to early 60's.
What would you call it??
I know right! But its now 30+ years old. Neo-Vintage?
Pre-Vintage 😜😜
Amis können auch auf schön.
What are you talking about, a 'sweet sounding resistor'? Makes no sense.
I am Sam I am. Green Eggs and Ham!
He means the sound is more focused in the midrange with less emphasis on the treble. Classic tube sound.
@@JohnLee-db9zt But this preamp doesn't have tubes.
@@daemonicflame One Tube! Two Tube! Red Tube! Blue Tube!
He obviously cannot give a sensible answer !
1000 dollars for a few parts n case overpriced
Less is more.
@@hificonspiracyMore profit for the moneygrubbers
More money to the seller
ne mogu da verujem da ovako skromno izgradjen fono moze dati kvalitetnu reprodukciju zvuka sa vinila.
ovo je siromasan budzetni fono.
Zdravo! Stvarno zašto? U poređenju sa čim? Fešte su pristrasne u klasi A. Njegovo jednostavno kolo koje pušta signal da prođe bez izobličenja. Manje je viљe.
R10------R4 ???
czcams.com/video/okvuz0ZAfhU/video.html
As soon as I saw the decimal point values on the resistors, R10 and R27, I knew that this product is 100% BS.
I'm an electronics engineer / electrician by trade with over 35 years professional experience, BTW.
R27 has a value of 47.5 Ohms and is in series with a 10uF capacitor that has a 10% tolerance..........Like, 0.5 Ohms is going to make ANY difference whatsoever. 🤣😂🤣😂🤣😂🤣
I don't understand your point regarding the resistor and capacitance values. They probably got a bulk deal on 47.5 Ohm resistors rather then 47R or perhaps it looked better in a SPICE model who knows who cares. How does that make the product BS? 10% tolerance is totally reasonable for MKP capacitor of 10uf value and inconsequential in my book. You know, it was you EEs that brought consumers the pathetic RedBook/CD standards and the digital hell we've been in for the last 35 years. ~sigh. I wish these threads had a EE filter.
@@hificonspiracy If you don't understand my point about the resistor and capacitor values, that will be because you don't understand electronics and electronic circuits.
@@zedcarr6128 I think it's the just the opposite Zed. I don't think you're really an EE. I think you're just spewing a bunch of terms you don't understand.
@@hificonspiracy The capacitor has a tolerance of 10%, 0.5 Ohms is just over 1% of 47.5 Ohms. Explain to me how 0.5 Ohms makes a difference?
If you want to test my knowledge on electronics and electrical engineering, you are more than welcome to have a go.
The resistors and capacitors in that circuit will change the frequency response of that circuit depending on their values. I know that, in that circuit, 0.5 Ohms will make no difference whatsoever. I've also played guitar for over 30 years and service and build my own audio gear. Anyone who is an electronics hobbyist or engineer, laugh their asses off at ''audiophiles'' claims and beliefs about electronics.
@@hificonspiracy czcams.com/video/m7ERMu825m4/video.html
Amis können auch auf schön.