Compatible Operational Amplifiers

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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.

Photo Brand Model Type Available 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 From INFO

(op amp pictured here) (any brand) (default base configuration) (any type) 40 N/A 0 100k 100 51 N/A 10 100 100 (maybe) (tested by Eisen Audio) N/A N/A (click here for additional information)

APP s.e. APP10 discrete, ? ? ? ? ? ? ? ? ? ? ? Yes, 75 No ? direct APP op amps

APP s.e. APP15 discrete, ? ? ? ? ? ? ? ? ? ? ? ? No ? direct APP op amps

APP s.e. APP2050 discrete, BJT diff in, A/B out 47 0 22 220k 47 0 N/A N/A 47 100 Yes, 75 partially $40 USD direct APP op amps

ADK Custom Shop DOPA-1 discrete, JFET diff in, A/B out ? ? ? ? ? ? ? ? ? ? Yes No ? inquire none available

Analog Devices 111 discrete, ? ? ? ? ? ? ? ? ? ? ? ? No ? used markets none available

API 2520 discrete, BJT diff in, A/B out 40 0 100 1M 100 47 N/A N/A N/A 100 Yes, 75 Yes ~$100 USD inquire or used markets API op amps

API 2520H hybrid, BJT diff in, A/B out 40 0 100 1M 100 47 N/A N/A N/A 100 Yes, 150 Yes ? used markets API op amps

API 2525 discrete, BJT diff in, A/B out 40 0 100 1M 100 47 N/A N/A N/A 100 Yes, 75 Yes ? used markets API op amps

Avedis 1122 discrete, BJT diff in, A/B out 51 0 100 1M 27 47 N/A N/A N/A 100 Yes, 75 Yes $80 USD direct Avedis info

BTI OA400 discrete, ? 50 0 100 N/A 30 47 N/A N/A 120 120 Yes, 75 Yes ? used markets BTI info

Fax Audio FA-100 discrete, ? ? ? ? ? ? ? ? ? ? ? Yes, ? partially ? used markets Fax info

Forssell Technologies JFET-992 discrete, JFET diff in, A out 54 0 0 N/A 20 51 N/A N/A N/A 33 No, 600 Yes $65 USD direct JFET op amps

Forssell Technologies JFET-993 discrete, JFET diff in, A out 54 0 0 N/A 20 51 N/A N/A N/A 33 No, 600 Yes $80 USD direct JFET op amps

Inward Connections SPA690 discrete, BJT diff in, B out 47 N/A 0 270k 47 47 N/A 4.7 N/A 10 Yes, ? No N/A not for sale SPA690 info

JLM Audio Hybrid Opamp DIP8 IC compatible, A/B out 43 0 0 N/A 68 51 N/A N/A 220 47 Yes, ? No $20 USD direct JLM op amps

JLM Audio 99V +/- 16V version discrete, BJT SFA in, bootstrap out 43 0 0 N/A 68 51 N/A N/A 220 47 Yes, ? Yes $54 USD direct JLM op amps

John Hardy Company 990C discrete, BJT diff in, A/B out 54 0 0 N/A 20 39 N/A N/A N/A 91 (100 will suffice) Yes, 75 Yes $49.95 USD direct 990 info

LAZ Pro LAZ25 discrete, BJT diff in, A/B out 40 0 100 1M 100 47 N/A N/A N/A 100 Yes, 75 Yes £39 GBP direct It's a 2520 copy

Little Labs The Discreet Opamp discrete, BJT diff in, A/B out ? ? ? ? ? ? ? ? ? ? ? No ? inquire none available

Melcor 1731 discrete, BJT diff in, A/B out 40 0 100 1M 100 47 N/A N/A N/A 100 Yes, 75 Yes ~$75 USD used markets 1731 info

Millennia Media MM-99 discrete, JFET diff in, A out 43 0 0 N/A 68 51 N/A N/A N/A 33 No, 600 Yes $75 USD Pro Audio Solutions JFET op amps

Millennia Media MM-990 discrete, JFET diff in, A out 43 0 0 N/A 68 51 N/A N/A N/A 33 No, 600 Yes ~$50 USD (discontinued) used markets JFET op amps

Modular Audio Products (MAP) 1731 discrete, BJT diff in, A/B out 40 0 100 1M 100 47 N/A N/A N/A 100 Yes, 75 No ~$75 USD used markets MAP/MDI op amps

Modular Audio Products (MAP) 1731A discrete, BJT diff in, A/B out 40 0 100 1M 100 47 N/A N/A N/A 100 Yes, 75 No ~$75 USD used markets MAP/MDI op amps

Modular Audio Products (MAP) 5002 discrete, ? ? ? ? ? ? ? ? ? ? ? ? No ? used markets MAP/MDI op amps

Modular Audio Products (MAP) 5003 ? ? ? ? ? ? ? ? ? ? ? ? partially ? used markets MAP/MDI op amps

Modular Audio Products (MAP) 5004 hybrid, ? ? ? ? ? ? ? ? ? ? ? ? partially ? used markets MAP/MDI op amps

Modular Audio Products (MAP) 5006 hybrid, ? ? ? ? ? ? ? ? ? ? ? ? No ? used markets MAP/MDI op amps

Modular Devices Inc. (MDI) 1731 discrete, BJT diff in, A/B out 40 0 100 1M 100 47 N/A N/A N/A 100 Yes, 75 No ~$75 USD used markets MAP/MDI op amps

Modular Devices Inc. (MDI) 1757 discrete, BJT diff in, A/B out 40 0 100 1M 100 47 N/A N/A N/A 100 Yes, ? No ? used markets MAP/MDI op amps

Old School Audio (OSA) ? ? ? ? ? ? ? ? ? ? ? ? Yes, 75 No ? inquire none available

ProTech Audio Model 1000 ? ? ? ? ? ? ? ? ? ? ? Yes, ? partially ? inquire ProTech info

Purple Audio KDJ 3 discrete, BJT diff in, A out 46 N/A 100 100k 51 51 N/A 4.7 N/A 68 No, 600 Yes $45 USD direct Purple op amps

Purple Audio KDJ 4 discrete, BJT diff in, A/B out 51 N/A 100 100k 27 68 N/A 4.7 N/A 68 Yes, 75 Yes $65 USD direct Purple op amps

RCA Operational Amplifier discrete, BJT diff in, A/B out 40 0 100 1M 100 47 N/A N/A N/A 100 Yes, 75 Yes ? used markets It's a rebranded 2520

Scott Liebers' SL-2520 discrete, BJT diff in, A/B out 40 0 100 1M 100 47 N/A N/A N/A 100 Yes, 75 No $70 USD Tangible Technology It's a 2520 copy

Seveth Circle Audio SC10 discrete, BJT diff in, A/B out 51 0 0 N/A 27 39 N/A N/A N/A 33 Yes, 75 No $79 USD direct SCA op amps

Seveth Circle Audio SC25 discrete, BJT diff in, A/B out 40 0 0 N/A 100 39 N/A N/A N/A 120 (100 will suffice) Yes, 75 Yes $79 USD direct SCA op amps

Seveth Circle Audio SC99 discrete, BJT diff in, A/B out 54 0 0 N/A 20 39 N/A N/A N/A 91 (100 will suffice) Yes, 75 No $79 USD direct SCA op amps

Sound Skulptor SK25 discrete, BJT diff in, A/B out 43 0 0 2M2 68 47 N/A N/A N/A 100 Yes, 75 No €50 EUR direct Sound Skulptor info

Sound Skulptor SK99 discrete, BJT diff in, A/B out 43 0 0 2M2 68 47 N/A N/A N/A 100 Yes, 75 No €50 EUR direct Sound Skulptor info

Sound Skulptor SK47 discrete, BJT diff in, A/B out 43 0 0 2M2 68 47 N/A N/A N/A N/A Yes, 150(?) No €50 EUR direct Sound Skulptor info

TOA PC-2011 ? ? ? ? ? ? ? ? ? ? ? ? No $45 USD(?) used markets none available

Yamaha NE80100 discrete, ? 46 0 0 1M 51 51 N/A N/A N/A 100 Yes, ? Yes $35 USD (discontinued) Gourmet PA Systems Yamaha Op Amps

Yamaha NE80200 discrete, BJT diff in, A/B out 46 0 0 1M 51 51 N/A N/A N/A 100 Yes, 75 Yes ~$25 USD(?) (discontinued) used markets Yamaha Op Amps