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GB for Salas Folded Simplistic Phono PCB

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#861
So I was reading about this topic when I realised that there is a group buy going on right now. I want to buy whatever I can in the group buy for one full kit.
Looking at the options in the spreadsheet has left me more confused than ever about what I need to sign up for. Any pointers?
 
#862
kaan said:
So I was reading about this topic when I realised that there is a group buy going on right now. I want to buy whatever I can in the group buy for one full kit.
Looking at the options in the spreadsheet has left me more confused than ever about what I need to sign up for. Any pointers?
Click to expand...

After a bit of reading I realised that the spreadsheet has more than one project in it. I copied the others that ordered Salas Simplistic Phono PCB and I hope this will work to my advantage 🙂
 
#863
kaan said:
After a bit of reading I realised that the spreadsheet has more than one project in it. I copied the others that ordered Salas Simplistic Phono PCB and I hope this will work to my advantage 🙂
Click to expand...

I think it mostly depends on what sort of gain you would like, so what kind of cartridge you will be using. The gain is fixed, so knowing what you will be working with determines if a pair of 2sk369BL should be ordered or for LOMC, a quad should be ordered.
 
#867
After a couple of years of procrastination I finally got around to firing up the project. Rock solid 50vdc from the raw PSU but sadly that is also the reading in the folded rail. VR2 can only bring it down to mid 40's at minium, both folded boards exactly the same - LED sequence correct on power-up, no smoke or dramas, just high rail voltage. I hope I have time to fault-find before the packers come to shift us to another country, I would like to finally hear this in action.
 
#868
For a quick test parallel some resistor value across each R3x that will make R3x about 30% lower than alone. If the rail will be now ranging lower with VR2x that means the build is alright but Q3x IDSS is simply bit much for the installed R3x. In that case change R3x with a proper value for a useful range or stay with the most suitable parallels for that.
 
#869
You don't know how happy that made me !!!
bcb68dfba811cc229a2b8653e0147079.jpg



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#871
ajst2duk said:
You don't know how happy that made me !!!
bcb68dfba811cc229a2b8653e0147079.jpg



Sent from my iPhone using Tapatalk
Click to expand...

ajst2duk said:
So good sounds resulted. One channel is rolled of on top and I need to work on earthing to lower noise floor but very stunning.


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Click to expand...
Rail level range problem solved. Nice. :up:

Having AC mains right in the middle between channels and possibly non magnetically shielded transformers left and right behind won't help with hum and buzz especially if in MC high gain configuration. A sectioned arrangement with a mu-metal shield between a left compartment for AC & TXs and a right compartment for audio would be far better. Judge that by final mains related noise levels after you finish with the channels grounding.

The channels should find ground to a non isolated chassis binding post for the TT ground wire as shown by yellow lines on general wiring section's Pic1 in the guide. Add such a post.

Use a shorter cable from the IEC earth prong to a nearby dedicated chassis bolt you should install. Make sure that whole chassis is in electrical contact through its bolts i.e. its anodizing or paint is not in the way. The raw PSU board has a pad designated PE-|Ξ From there make a wire connection to that same mains earth chassis bolt.

There is no reason to have rolled off highs in one channel unless C2 or C2x are wrong in value so double check there. Else its the cart installation to be checked for azimuth anti-skating etc.
 
#872
Thanks Salas - this is purely a test case - not intending for this to be the final implementation but I just wanted to get a feel for the sound before investing more. I have a lot of work to do shortening and tightening up wiring - again just a mash-up to test. The transformers were custom wound with earthing and screening so should be not emitting much radiated noise. Once I have sorted the channel imbalance (must be the folded phono as was fine with 2 other phonos) I will do some work to bring out the best. I am using 2M black MM cart. Very excited about the sound of this combo.


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#873
That explains the odd configuration in the photo then. For the channel imbalance first reverse the incoming cables from the TT. If the roll-off remains in the same channel, then its in the channel. Check all resistors and capacitors values against the good channel. Including the load switch resistors. I haven't heard of such a different EQ thing before in the many builds presented but I have seen misplaced resistors for gain once. The two common things are a reversed LED placement or not having checked idss Q3x against R3x value and chancing on low rail range. You chanced on much high combination, very seldom. For any further help visit the main thread Simplistic NJFET RIAA so we all give ideas for debugging or about configuration, parts, etc. When finished to well matched and quiet, a bit run-in also, there will be more good sonics. Your cart is good, has advanced needle profile for MM. The Nagaoka MP-500 is also good in that expensive MM category.
 
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