I'm curious what you get when you measure voltage on R27. If you are high on current and end up changing R27, I'm curious to see if that impacts the pre-reg 17.3V much. You need 2V+ before the regs, and and you have 2.3V now. So once you check out R27 I think you're ready for rock'n'roll. Or jazz, classical, etc.
Just finished my Pearl 3 last night and plugged it into my system. Here are some photos of the build. First off is the PSU, in a separate enclosure. When under test I get 21.88/21.89 Vdc output.
Attachments
Next up is the enclosure, it's one from the DiyAudiostore. Boards installed and psu connection wired in. 14.99/15 Vdc on the outputs of the positive regulators and -15/-15 on the negative regulators.
Attachments
-
IMG_20240512_222435030_HDR.jpg426.3 KB · Views: 60
-
IMG_20240512_222437412_HDR.jpg435 KB · Views: 60
-
IMG_20240512_222440590_HDR.jpg517 KB · Views: 59
-
IMG_20240512_224031433_HDR.jpg510.3 KB · Views: 56
-
IMG_20240512_222430557_HDR.jpg436.6 KB · Views: 55
-
IMG_20240512_215105029_HDR.jpg446.8 KB · Views: 56
-
IMG_20240512_215101716_HDR.jpg495 KB · Views: 58
-
IMG_20240512_215055424_HDR.jpg489.8 KB · Views: 57
-
IMG_20240512_215051689_HDR.jpg478.5 KB · Views: 61
-
IMG_20240512_214816867_HDR.jpg309.7 KB · Views: 56
-
IMG_20240512_213925719_HDR.jpg337.1 KB · Views: 62
I decided to add dampening to the enclosure (not because I had to, but I had the sheets so why not) this is DIY after all. I also fitted the PCB's to a removable mounting plate so I could add even more damping material by the boards.
Attachments
-
IMG_20240519_182103567_HDR.jpg558.9 KB · Views: 52
-
IMG_20240519_181438721_HDR.jpg502.6 KB · Views: 41
-
IMG_20240519_180951970_HDR.jpg504 KB · Views: 36
-
IMG_20240519_180807786_HDR.jpg503.1 KB · Views: 37
-
IMG_20240519_180802010_HDR.jpg512.8 KB · Views: 35
-
IMG_20240519_175810951_HDR.jpg495.5 KB · Views: 40
-
IMG_20240519_173740460_HDR.jpg564.8 KB · Views: 45
-
IMG_20240519_173243931_HDR.jpg363.8 KB · Views: 41
-
IMG_20240519_182536413_HDR.jpg518.5 KB · Views: 42
-
IMG_20240519_183701052_HDR.jpg471.7 KB · Views: 46
-
IMG_20240519_190324323_HDR.jpg495.9 KB · Views: 53
- Home
- Amplifiers
- Pass Labs
- Pearl 3 Burning Amp 2023