Pearl 3 Burning Amp 2023

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#5,381
Mark Johnson said:
It's only a matter of time until someone deploys four 12V sealed lead acid batteries to give "raw" ±24 volt supplies, then connects a UDP3 filter board between the batteries and a Pearl 3 phonostage. Batteries ---> UDP3 filter ---> Pearl 3. UDP3 includes four heatsinks and it can comfortably drop ±24V to ±19V_approx while running cool.

Why would anyone do such a thing? Maybe, because it seems like a lot of fun; AND because it completely isolates Pearl 3 from the AC mains; AND because it also yields an even lower noise supply. Batteries are a lot quieter at 2xFmains than the transformer + rectifiers + filter capacitors on UDP3, after all.

If they put the batteries in a separate chassis, Pearl 3 becomes a three chassis phonostage: batteries; supply filter ; phono amplification. It might allow the builder to include recharging circuitry (with double or triple relay isolation) in the third chassis. The recharge contrivances could run from a pair of DC wall warts if desired; then all three chassis would be completely isolated from the AC mains -- including the rechargeable battery box.
Click to expand...
 
#5,382
Amen to that, i wanna build Pearl 3 with battery PSU, power sonics (brand)battery, charging unit all mentioned above, unfortunately my skills (lack of them) can't allow me to do that, Company Channel D uses in their phono stages battery PSU And they sound vacuum dead quiet.
 
#5,385
Belerophonus said:
shame there Is not dual PSU solution, if there is real improvement for such solution.
Click to expand...
There is, if you diy it. Isn´t it what this is about.......... diy??
You double it yourself. I did. Had transformer made with 4 x 16 volt secondaries, 2 x psu-pcb´s and
7 pole connector (plus - 0 - minus x 2 and a chassis connection) and voila....... You have a dual psu 😉
 
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#5,388
Hi,
I had this kit(s) for a long time but some months ago I set my TT asaide... it was a mistake.
Some days ago I rediscovered the TT-sound and decided to build the Pearl 3, finally.
So, the psu took one and a half hours to finish, and now to the amp boards 😀
Here the psu boards, left the original kit, the other one is from @rhthatcher

PSX_20250330_110000.jpg
 
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#5,395
You must tape the device in place if soldering with a normal iron. Wet the tip, place the tip so it will touch the pad and the lead, and add a bit more solder than has a good flux.

If you are using lead-free solder, well, best of luck, you'll need it.
 
#5,397
Use the Toshiba 2SK209's. The circuit was intended for them. They are sitting on your bench right now. The other component values need no modifications.


Genuine Toshiba 2SK170 can be had from seller Punkydawgs on eBay, send a note and ask for the lowest Idss quads he has.

Yes, you could use the LSK170 from the store, get the lowest Idss.

If using any 170s, change the source resistors to 22R.
 
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#5,399
6L6 said:
You must tape the device in place if soldering with a normal iron. Wet the tip, place the tip so it will touch the pad and the lead, and add a bit more solder than has a good flux.

If you are using lead-free solder, well, best of luck, you'll need it.
Click to expand...

liquid helper flux is way to go

lead free, only for masochist ........ and those having spare smd parts
 
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