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The DIY500 mkII PCB can accept any op amp which conforms to the same physical package and electrical pinout as popularized by the API™ 2520, and operates on bipolar (+/-) 15 or 16VDC power supplies.

The following discrete and hybrid op amps reportedly meet these requirements. We have listed current products, as well as many discontinued items which occasionally appear in used markets.


Key:
Component designations R9, C4, OLI, etc. refer to the DIY500 mkII schematic, and are printed on the PCB surface.
A resistor value of 0 indicates a short circuit. Use zero ohm jumper resistors, or straight wire, such as clipped resistor leads.
N/A means not applicable. Leave that component out altogether.

Please Note: An entry of "?" means value unknown. When the value is unknown, or whenever you're doubtful of the value listed, use the "default base configuration" values for safe testing. You're guaranteed some level of functionality when doing so, albeit not always optimal performance.


Click column titles to sort by value. Refresh this page to return to initial sorting.

PhotoBrandModel TypeAvailable Gain (dBu)R9 (Ω)R10 (Ω)R11 (Ω)R13 (Ω)R14 (Ω)R15 (Ω)C4 (µF)C5 (pF)C8
(pF)
Drives an output transformer?, Min. Load (Ω)Tested?Price (1 piece)Purchase FromINFO
(op amp pictured here)(any brand)(default base configuration) (any type)40N/A0100k10051N/A10100100(maybe)(tested by Eisen Audio)N/AN/A(click here for additional information)
APP s.e.APP10 discrete, ???????????Yes, 75No?directAPP op amps
APP s.e.APP15 discrete, ????????????No?directAPP op amps
APP s.e.APP2050 discrete, BJT diff in, A/B out 47022220k470N/AN/A47100Yes, 75partially$40 USDdirectAPP op amps
ADK Custom ShopDOPA-1 discrete, JFET diff in, A/B out??????????YesNo?inquirenone available
Analog Devices111 discrete, ????????????No?used marketsnone available
API2520 discrete, BJT diff in, A/B out4001001M10047N/AN/AN/A100Yes, 75Yes~$100 USDinquire or used marketsAPI op amps
API2520H hybrid, BJT diff in, A/B out4001001M10047N/AN/AN/A100Yes, 150Yes?used marketsAPI op amps
API2525discrete, BJT diff in, A/B out4001001M10047N/AN/AN/A100Yes, 75Yes?used marketsAPI op amps
Avedis1122 discrete, BJT diff in, A/B out5101001M2747N/AN/AN/A100Yes, 75Yes$80 USDdirectAvedis info
BTIOA400 discrete, ?500100N/A3047N/AN/A120120Yes, 75Yes?used marketsBTI info
Fax AudioFA-100 discrete, ???????????Yes, ?partially?used marketsFax info
Forssell TechnologiesJFET-992 discrete, JFET diff in, A out5400N/A2051N/AN/AN/A33No, 600Yes$65 USDdirectJFET op amps
Forssell TechnologiesJFET-993 discrete, JFET diff in, A out5400N/A2051N/AN/AN/A33No, 600Yes$80 USDdirectJFET op amps
Inward ConnectionsSPA690 discrete, BJT diff in, B out47N/A0270k4747N/A4.7N/A10Yes, ?NoN/Anot for saleSPA690 info
JLM AudioHybrid Opamp DIP8 IC compatible, A/B out4300N/A6851N/AN/A22047Yes, ?No$20 USDdirectJLM op amps
JLM Audio99V +/- 16V version discrete, BJT SFA in, bootstrap out4300N/A6851N/AN/A22047Yes, ?Yes$54 USDdirectJLM op amps
John Hardy Company990C discrete, BJT diff in, A/B out5400N/A2039N/AN/AN/A91 (100 will suffice)Yes, 75Yes$49.95 USDdirect990 info
LAZ ProLAZ25 discrete, BJT diff in, A/B out4001001M10047N/AN/AN/A100Yes, 75Yes£39 GBPdirectIt's a 2520 copy
Little LabsThe Discreet Opamp discrete, BJT diff in, A/B out???????????No?inquirenone available
Melcor1731discrete, BJT diff in, A/B out4001001M10047N/AN/AN/A100Yes, 75Yes~$75 USDused markets1731 info
Millennia MediaMM-99discrete, JFET diff in, A out 4300N/A6851N/AN/AN/A33No, 600Yes$75 USDPro Audio SolutionsJFET op amps
Millennia MediaMM-990discrete, JFET diff in, A out4300N/A6851N/AN/AN/A33No, 600Yes~$50 USD (discontinued)used marketsJFET op amps
Modular Audio Products (MAP)1731discrete, BJT diff in, A/B out4001001M10047N/AN/AN/A100Yes, 75No~$75 USDused marketsMAP/MDI op amps
Modular Audio Products (MAP)1731Adiscrete, BJT diff in, A/B out4001001M10047N/AN/AN/A100Yes, 75No~$75 USDused marketsMAP/MDI op amps
Modular Audio Products (MAP)5002discrete, ????????????No?used marketsMAP/MDI op amps
Modular Audio Products (MAP)5003????????????partially?used marketsMAP/MDI op amps
Modular Audio Products (MAP)5004hybrid, ????????????partially?used marketsMAP/MDI op amps
Modular Audio Products (MAP)5006hybrid, ????????????No?used marketsMAP/MDI op amps
Modular Devices Inc. (MDI)1731discrete, BJT diff in, A/B out4001001M10047N/AN/AN/A100Yes, 75No~$75 USDused marketsMAP/MDI op amps
Modular Devices Inc. (MDI)1757discrete, BJT diff in, A/B out4001001M10047N/AN/AN/A100Yes, ?No?used marketsMAP/MDI op amps
Old School Audio (OSA)????????????Yes, 75No?inquirenone available
ProTech AudioModel 1000???????????Yes, ?partially?inquireProTech info
Purple AudioKDJ 3discrete, BJT diff in, A out46N/A100100k5151N/A4.7N/A68No, 600Yes$45 USDdirectPurple op amps
Purple AudioKDJ 4discrete, BJT diff in, A/B out51N/A100100k2768N/A4.7N/A68Yes, 75Yes$65 USDdirectPurple op amps
RCAOperational Amplifierdiscrete, BJT diff in, A/B out4001001M10047N/AN/AN/A100Yes, 75Yes?used marketsIt's a rebranded 2520
Scott Liebers'SL-2520discrete, BJT diff in, A/B out4001001M10047N/AN/AN/A100Yes, 75No$70 USDTangible TechnologyIt's a 2520 copy
Seveth Circle AudioSC10discrete, BJT diff in, A/B out5100N/A2739N/AN/AN/A33Yes, 75No$79 USDdirectSCA op amps
Seveth Circle AudioSC25discrete, BJT diff in, A/B out4000N/A10039N/AN/AN/A120 (100 will suffice)Yes, 75Yes$79 USDdirectSCA op amps
Seveth Circle AudioSC99discrete, BJT diff in, A/B out5400N/A2039N/AN/AN/A91 (100 will suffice)Yes, 75No$79 USDdirectSCA op amps
Sound SkulptorSK25discrete, BJT diff in, A/B out43002M26847N/AN/AN/A100Yes, 75No€50 EURdirectSound Skulptor info
Sound SkulptorSK99discrete, BJT diff in, A/B out43002M26847N/AN/AN/A100Yes, 75No€50 EURdirectSound Skulptor info
Sound SkulptorSK47discrete, BJT diff in, A/B out43002M26847N/AN/AN/AN/AYes, 150(?)No€50 EURdirectSound Skulptor info
TOAPC-2011????????????No$45 USD(?)used marketsnone available
YamahaNE80100discrete, ?46001M5151N/AN/AN/A100Yes, ?Yes$35 USD (discontinued)Gourmet PA SystemsYamaha Op Amps
YamahaNE80200discrete, BJT diff in, A/B out46001M5151N/AN/AN/A100Yes, 75Yes~$25 USD(?) (discontinued)used marketsYamaha Op Amps




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