Our modern version on the Deane Jensen 990 opamp. Due to our improved dual constant currents tracking more than 10 times better than the original, the C upgrade for wide voltage range is not needed so the design is closer to the original 990 version but can run on even wider voltage range. We have added the A update to protect against +V loss drawing high current from output to -V which can damage output transformers. The same original 990A circuit in SMD and through-hole with aluminum heatsink for better cooling.
- Wider voltage range +/-12vdc to +/-28vdc
- Draws 25mA @ idle
- Improved Dual Constant Currents
- SSM2212 2 x 50 transistor matched input pair replaces LM394
- Open repairable SMD design
Test Summary @ +/-24vdc
| Frequency response (from 40 Hz to 15 kHz), dB | +0.02, -0.03 | Excellent |
| THD, % | 0.00205 | Excellent |
| THD + Noise, dB (A) | -114.5 | Excellent |
| IMD + Noise, % | 0.00217 | Excellent |
| General performance | | Excellent |
Frequency response
| | Left | Right |
| From 20 Hz to 20 kHz, dB | -0.04, +0.07 | -0.04, +0.07 |
| From 40 Hz to 15 kHz, dB | -0.03, +0.02 | -0.03, +0.02 |
THD + Noise (at -3 dB FS)
| | Left | Right |
| THD, % | 0.00205 | 0.00205 |
| THD + Noise, % | 0.00209 | 0.00209 |
| THD + Noise (A-weighted), % | 0.00205 | 0.00205 |
Intermodulation distortion
| | Left | Right |
| IMD + Noise, % | 0.00217 | 0.00217 |
| IMD + Noise (A-weighted), % | 0.00211 | 0.00211 |
You can save money on this item when you purchase several at a time. The table below shows the minimum quantities required to benefit from this offer, and how much they'll cost.
| Quantity | Price per unit |
|---|
| 1 | ¥6,912 |
| 10+ | ¥6,756 |
| 25+ | ¥6,236 |
