Description
Lambda LPD 425 FM Dual Regulated DC Power Supply 250V 0.13A For Parts
The Lambda LPD 425 FM is a dual-channel regulated DC bench power supply made by Lambda Electronics Corp. of Melville, New York. Each channel provides independently adjustable DC output voltage up to 250 VDC with a current limiter, controlled via coarse and fine adjustment knobs. Four analog panel meters — two DC voltmeters and two DC ammeters — give simultaneous readings for both channels. This unit is being sold as-is: the left-channel voltage meter is broken and does not respond, though both channel voltage outputs have been tested and verified good using the control knobs.
Specifications & What's Included
- Manufacturer: Lambda Electronics Corp., Melville, L.I., N.Y.
- Model: LPD 425 FM (Dual Regulated Power Supply)
- Number of channels: 2 (independent dual output)
- Output voltage per channel: 0–250 VDC
- Maximum output current: 0.13A @ 30°C
- Rated current (temperature derated): 0.12A @ 40°C / 0.11A @ 50°C / 0.10A @ 60°C
- Voltage adjustment: coarse and fine control knobs per channel
- Current limiter: adjustable per channel
- Panel meters: 4 analog meters — 2x DC Volts, 2x DC Amperes
- Output terminals: banana / binding posts per channel (positive and negative)
- Form factor: benchtop
- Known defect: left-channel DC voltmeter broken and non-responsive
- Both channel voltage outputs tested good
- Unit only — no power cord included
Applications
The Lambda LPD series dual regulated power supplies were widely used in electronics labs, engineering benches, and production test environments from the 1960s through the 1980s, when Lambda Electronics was one of the leading names in American bench power supply manufacturing. A dual-output regulated supply like the LPD 425 FM is suited to applications requiring two independently controlled DC rails — for example, powering op-amp circuits requiring positive and negative supplies, driving vacuum tube circuits needing a high-voltage B+ rail alongside a lower-voltage filament or bias supply, or running two separate test circuits simultaneously. The high maximum output voltage of 250 VDC per channel makes this model particularly relevant to tube-era electronics, high-voltage sensor work, and some electrostatic or analog circuit testing. Lambda was acquired by TDK and its product lines evolved considerably over the decades; original Lambda benchtop units like this remain collectible among vintage test equipment enthusiasts and are still sought for legacy lab and repair work.
This Lambda LPD 425 FM Dual Regulated DC Power Supply is being sold as-is due to a known defect: the left-channel voltage meter is broken and does not respond. Both channel voltage outputs have been tested and read correctly with the coarse and fine control knobs. The right-channel meters appear functional. The enclosure shows moderate cosmetic wear consistent with bench use — scuffing and light marks on the front panel and chassis sides are visible in the photos. The unit is sold as-is with no warranty. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Lambda |
Model: |
LPD 425 FM |
MPN: |
LPD425FM |
Type: |
Dual Regulated DC Bench Power Supply |
SKU: |
46833 |
Output Voltage: |
0–250 VDC per channel |
Output Current: |
0.13A @ 30°C, 0.12A @ 40°C, 0.11A @ 50°C, 0.10A @ 60°C |
Number of Outputs: |
2 (Dual Channel) |
Voltage Regulation: |
Coarse and Fine control knobs per channel |
Current Limiter: |
Adjustable current limiter per channel |
Panel Meters: |
4 analog meters: 2x DC Volts, 2x DC Amperes (left V meter broken) |
Form Factor: |
Benchtop |
Manufacturer: |
Lambda Electronics Corp., Melville, L.I., N.Y. |
Seller Notes: |
Unit only — no power cord visible. Left-channel voltage meter non-functional. |
Country/Region of Manufacture: |
United States |
Condition Notes: |
Lambda LPD 425 FM Dual Regulated DC Power Supply sold AS-IS. Left-channel voltage meter is broken/non-responsive. Both channel voltage outputs tested good via coarse/fine knobs. Cosmetic wear present. No warranty. |
California Prop 65 Warning: |
WARNING: This product can expose you to chemicals including lead and lead compounds, and DEHP (a phthalate), which are known to the State of California to cause cancer and birth defects or other reproductive harm. Go to P65Warnings.ca.gov |
