B&K Precision 1687B
#7 in Single outputFull review
A durable name-brand switching supply for service benches and 24 V equipment, with a warranty the import brands do not offer.
Amazon $408$408
The B&K Precision 1687B rates 3.1 among single output bench power supplys; the B&K Precision 1671A rates 2.0 among multi-output ones. The B&K Precision 1671A costs $38.47 less ($369.53 vs $408).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
B&K Precision 1671A
#9 in Multi-outputFull review
A basic bench supply with fixed logic rails, for classrooms and service benches that do not need PC control.
Amazon $369.53$369.53
Scores side by side
These two sit in different type classes (single output and multi-output), and each is scored against the reference points for its own class, so a rating says how well each does among its own type peers. How we rank explains each factor.
| Factor weight | B&K Precision 1687B | B&K Precision 1671A |
|---|---|---|
| Overall rating | 3.1/5 | 2.0/5 |
| Value 25% | 42 $1.13 per watt ($408, 360 W rated) | 22 $2.33 per watt ($369.53, 158.5 W from the channel ratings) |
| Output quality 20% | 33 5 mVrms ripple and noise | 33 5 mVrms ripple and noise |
| Resolution 15% | 50 resolution not published (neutral score used) | 0 100 mV / 10 mA readback resolution |
| PC control 15% | 50 USB | 0 no PC interface |
| Protection & features 10% | 50 over-voltage protection, stored setups | 30 over-voltage protection |
| Warranty 15% | 50 2-year warranty | 0 1-year warranty |
Specifications
| B&K Precision 1687B | B&K Precision 1671A | |
|---|---|---|
| Output | ||
| Type | Power supply | Power supply |
| Regulation | Switching | - |
| Channels | 1 | 3 |
| Channel ratings | 1-36 V/10 A | 30 V/5 A, 12 V/0.5 A fixed, 5 V/0.5 A fixed |
| Max voltage | 36 V | 30 V |
| Max current | 10 A | 5 A |
| Rated power | 360 W | 158.5 W (channels added) |
| Ripple and noise | 5 mVrms / 50 mVp-p | 5 mVrms |
| Precision | ||
| Readback resolution | - | 100 mV / 10 mA |
| Control | ||
| PC interfaces | USB, analog remote | None |
| Stored setups | 3 | - |
| Over-voltage protection | Yes | Yes |
| Build | ||
| Weight | 5.2 lb | 14.3 lb |
| Warranty | 2 years | 1 year |