These are the parts required to fully populate the PPA board.
I don't give part numbers for resistors because resistors are more or less generic. I recommend 1% metal film types for most of the resistors on the board. See the schematic and the Part Selection Guide for recommended resistor values and types.
Some components are marked "Alt.". These are alternatives for the immediately preceding component.
| Description | Qty | ID | Digi-Key | Newark | Mouser | RS Components |
|---|---|---|---|---|---|---|
| Electrolytic capacitor, radial | 1 to 9 | C1 | See Guide for selection advice | |||
| Film bypass capacitor, radial, 10mm pitch, 0.1 µF | 5 | C2 | BC2091 | – | – | – |
| Alt. film bypass capacitor, axial, 0.1 µF | 5 | C2 | – | – | 75-MKT1813410254 | – |
| Electrolytic capacitor, radial, 10mm, 220 µF/35 V | 6 | C4 | P10297 | – | 647-UPW1V221MPD | – |
| 10pF silver mica cap | 1 | C6 | 338-1061 | – | 5982-15-500V10 | – |
| Alt. 100pF silver mica cap | 1 | C6 | 338-1042 | – | 5982-15-500V100 | – |
| Rail isolation JFET (8mA min.) | 6 | Q3 | – | 18C9222 | 512-2N5486 | – |
| Alt. rail isolation JFET (5mA min.) | 6 | Q3 | – | 18C7931 | 512-PN4393 | – |
| Alt. rail isolation JFET (25mA min.) | 6 | Q3 | – | 18C7930 | 512-PN4392 | – |
| Alt. rail isolation JFET (50mA min.) | 6 | Q3 | – | 13C1485 | 512-PN4391 | – |
| Buffer bias CCS JFET | 3 | Q4 | – | 18C7930 | 512-PN4392 | – |
| Buffer driver transistors, 2N5087, formed leads | 9 | Q21-23 | 2N5087RLRAOSCT | – | 512-2N5087_J18Z | – |
| Alt. buffer driver transistors, straight leads | 9 | Q21-23 | 2N5087 | – | 512-2N5087BU | – |
| Buffer driver transistors, 2N5088, formed leads | 9 | Q31-33 | – | – | 512-2N5088_J61Z | – |
| Alt. buffer driver transistors, straight leads | 9 | Q31-33 | 2N5088BU | – | 512-2N5088BU | – |
| Output transistor, + side, MJE243 | 3 | Q24 | MJE243OS | – | – | – |
| Alt. output transistor, + side, BD139 | 3 | Q24 | BD139OS | – | 511-BD139 | – |
| Output transistor, - side, MJE253 | 3 | Q34 | MJE253OS | – | – | – |
| Alt. output transistor, - side, BD140 | 3 | Q34 | BD140OS | – | 511-BD140 | – |
| Texas Instruments TLE2426CLP ("rail splitter") | 3 | TLE | 296-1994 | 08F9196 | 595-TLE2426CLP | 284-220 |
| Alt. rail splitter, different packaging | 3 | TLE | 296-1994-1 | – | – | – |
| Op-amp, AD8610AR | 3 | OPAMP | – | 85C1244 | – | – |
| Alt. op-amp, OPA627AP | 3 | OPAMP | OPA627AP | – | – | – |
| Output resistor, 2.2 Ω, 1 or 2 W | 6 | R24/34 | 2.2W-1 | – | 282-2.2 | – |
| Alt. output resistor, 4.7 Ω, 1 or 2 W | 6 | R24/34 | 4.7W-1 | – | 282-4.7 | – |
| Alt. output resistor, 10 Ω, 1 or 2 W | 6 | R24/34 | 10W-1 | – | 282-10 | – |
| Cermet multiturn trim pot, Bourns 3296W, 2K | 3 | R12 | 3296W-202 | 03F3879 | 652-3296W-1-202 | – |
| Alt. trim pot, BC CT-94W | 3 | R12 | CT94W202 | 92B1725 | – | – |
| Alt. trim pot, Murata PV36W | 3 | R12 | 490-2284 | – | 81-PV36W202A01B00 | – |
| Alt. trim pot, Vishay-Spectrol Model 64 | 3 | R12 | – | 67F5828 | 594-64W202 | – |
| Power input diode, 50V 1A, DO-41 | 1 | D1 | 1N4001FSCT | 18C8911 | 625-1N4001-E3 | – |
| Enclosure, Hammond 1455N16xx silver, metal panels silver, plastic panels black, metal panels black, plastic panels |
1 | n/a |
1455N1601 1455N1602 1455N1601BK 1455N1602BK |
84C9899 84C9900 72C8919 84C9901 |
546-1455N1601 546-1455N1602 546-1455N1601BK 546-1455N1602BK |
– – – – |
| Input jacks (RCA; black, white and red) | 2 | IN | CP-1412 CP-1414 CP-1413 |
84N1165 – – |
161-2003 161-1004 161-2002 |
476-586 – 476-592 |
| Output jack, 1/4", locking, isolated | 1 | OUT | – | 46F8572 | 568-NJ3FP6C | – |
| Alt. 1/4" jack, standard style, isolated | 1 | OUT | – | 57F3306 | 502-N112B | 449-348 |
| Alt. 1/4" jack, standard style, isolatable | 1 | OUT | SC1123 | – | 502-RN112BPC | – |
| Alt. stereo mini jack (3.5mm), isolated | 2 | IN/OUT | – | – | 161-7300 | – |
| 5.5/2.5mm DC power jack, isolated | 1 | n/a | CP-011B | – | 163-4303-EX | – |
| Alt. DC power jack, isolated, locking | 1 | n/a | – | – | 163-1100 | – |
| Power switch (round DPDT rocker) | 1 | S1 | EG1890 | 26H5744 | 612-RR3130B | – |
| Volume control, ALPS RK27, 50 kΩ | 1 or 2 | VOL | – | – | – | 236-9604 |
| Volume knob, aluminum, silver and black | 1 or 2 | n/a | 226-3002 226-1002 |
92N4096 92N4099 |
45KN031 450-7031 |
196-5813 196-5829 |
Here are some parts that you may need, or that are "preference" things. The Part Selection Guide will help you to decide which optional parts you want, and which ones you wish to leave out.
| Description | Qty | ID | Digi-Key | Newark | Mouser | RS Components |
|---|---|---|---|---|---|---|
| 1.0 µF/50 V+ metalized polyester box cap | 6 | C5 | BC1622 | 06H2389 | 75-MKT1826510066 | – |
| Alt. 1.5 µF/50 V+ metalized polyester box cap | 6 | C5 | BC1626 | 18C4917 | 75-MKT1826515054 | – |
| Alt. 2.2 µF/50 V+ metalized polyester box cap | 6 | C5 | – | 65C1750 | 75-MKT1826522055 | – |
| Film capacitor | 2 | C7 | See Guide for selection advice | |||
| Cermet multiturn trim pot, Bourns 3296W, 2K | 3 | R9 | 3296W-202 | 03F3879 | 652-3296W-1-202 | – |
| Alt. trim pot, BC CT-94W | 3 | R9 | CT94W202 | 92B1725 | – | – |
| Alt. trim pot, Murata PV36W | 3 | R9 | 490-2284 | – | 81-PV36W202A01B00 | – |
| Alt. trim pot, Vishay-Spectrol Model 64 | 3 | R9 | – | 67F5828 | 594-64W202 | – |
| Cascode JFET, 2N5484 | 3 | Q1 | – | 38C7726 | 512-2N5484 | – |
| Cascode JFET, 2N5486 | 3 | Q2 | – | 13C2012 | 512-2N5486 | – |
| Power indicator LED, red, 3mm | 1 | LED | 516-1308 | 90F5862 | 638-HLMP-1700 | 588-386 |
| Alt. power indicator LED, amber | 1 | LED | 516-1310 | 96F2333 34C0661 |
638-HLMP1719 | 588-392 |
| Alt. power indicator LED, green | 1 | LED | 516-1309 | 87F393 | 638-HLMP1790 | 589-014 |
| Alt. power indicator LED, blue | 1 | LED | L14006 | – | 606-CMD264UBD | – |
| Alt. power indicator LED, white | 1 | LED | CMD204UWC | – | 606-CMD204UWC | – |
| LED current-limiting JFET | 1 | FET | – | 38C7726 | 512-2N5484 | – |
| LED low-voltage zener, 1N523x, 4.7 to 9.1V | 1 | ZNR | 1N523xBMSCT | – | 78-1N523xB | – |
| Alt. LED low-voltage zener, 1N524x, 10 to 19V | 1 | ZNR | 1N524xBMSCT | – | 78-1N524xB | – |
| Bass-boost switch (short-bat DPST toggle) | 1 | S2 | EG2403 | – | 612-100-F2311 | – |
| DIP-8 IC sockets, gold contacts | 3 | n/a | ED90032 | 04M0550 | 575-11043308 | 813-115 |
| Power supply (Elpac WM080) | 1 | n/a | – | 16F126 | – | – |
| Molex KK male 3-pin upright connector | 1 | n/a | WM4201 | – | 538-22-23-2031 | – |
| Molex KK female 3-pin connector | 1 | n/a | WM2001 | – | 538-22-01-3037 | – |
| Molex KK crimp terminals | 3 | n/a | WM2200 | – | 538-08-50-0114 | – |
|
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