Description
Carl Olsson OLTRO LS7C Likriktare M2511-108010 Rectifier 220V Telecom Bench
The Carl Olsson OLTRO LS7C is a vintage Swedish-made Likriktare — the Swedish word for rectifier — a benchtop DC power instrument manufactured by Carl Olsson of Stockholm. Identified by part number M2511-108010 and reference CVA 0267, this is a tube (vacuum valve) based rectifier and measuring instrument designed for telecommunications and teletekniska (telecom technical) bench work. The front panel provides multiple selectable DC voltage output ranges and current ranges, with a built-in analog volt/milliamp panel meter for direct reading.
Specifications & What's Included
- Manufacturer: Carl Olsson, Stockholm, Sweden
- Model: OLTRO LS7C (Typ LS 7 C)
- Part / BET Number: M2511-108010
- Reference / Asset Number: CVA 0267
- Input Power: 220V AC, 3A (2-pin European-style inlet, rear panel)
- Power switch: Toggle switch labeled "TILL" (Swedish: ON), rear panel
- DC Voltage Output Ranges (front panel selectable): 0–190V, 0–200V, 0–450V, 200–450V
- DC Current Output Ranges: 150 mA, 200 mA, 250 mA; 4.5A output terminals also present
- Additional output: 0.5Ω / 150V / 30 mA range (front panel label)
- Built-in analog panel meter: V / mA dual-scale
- Internal technology: Vacuum tube (valve) based — multiple large power rectifier tubes and smaller signal/regulator tubes visible internally
- Form factor: Benchtop portable with metal carry handle
- Enclosure: Gray painted steel case
- Front panel markings in Swedish
- Country of Manufacture: Sweden
Applications
The OLTRO LS7C Likriktare is a mid-twentieth century Swedish telecommunications bench instrument, likely dating from the 1950s to 1960s based on its all-tube construction, European power connector, and the Carl Olsson Stockholm branding — a company historically associated with Swedish telecom and precision electrical instrument supply. "Likriktare" translates directly as rectifier, and this type of instrument was used in telecom maintenance and testing workshops to supply variable regulated DC at known voltages and currents for testing telephone exchange equipment, relay systems, signal circuits, and other telecommunications hardware that required stable DC bench power. The multiple selectable voltage and current ranges made it a versatile bench supply for servicing a range of telecom line and switching equipment. Instruments of this type were standard fixtures in Swedish state telecom (Televerket) facilities and military/aviation electronics workshops — the label visible on the front panel references Centrala Flygverkstaden (Central Aviation Workshop), indicating this unit served in a Swedish aviation maintenance environment. Today, units like this are primarily of interest to vintage electronics collectors, vacuum tube enthusiasts, and restorers of period Scandinavian telecom and avionics equipment.
This Carl Olsson OLTRO LS7C Likriktare (Rectifier), part M2511-108010, is being sold as-is for parts or repair with no functionality guarantee. The unit is a tube-based Swedish telecom bench instrument and has not been tested at our facility. Externally, the gray metal case shows significant age-related wear including surface rust on the rear panel around the power inlet area, paint loss on the bottom edges, and general patina consistent with its vintage. The front panel controls, selector switches, and analog V/mA meter appear intact. Internally, the vacuum tube complement is visible and the tubes appear physically present, though their functional condition is unknown. The power inlet accepts a 2-pin European-style connector at 220V. This item is sold strictly as-is — please review all photos carefully and contact us with any questions before purchasing.
Warranty Information
Additional Information
Brand: |
Carl Olsson |
Model: |
LS7C |
MPN: |
M2511-108010 |
Secondary Model: |
OLTRO LS7C |
SKU: |
47685 |
Type: |
Likriktare (Rectifier) / Telecom Bench Instrument |
Condition: |
As-Is / For Parts or Not Working |
Power Requirements: |
220V AC, 3A |
Voltage Outputs: |
0-190V, 0-200V, 0-450V, 200-450V ranges |
Current Outputs: |
150 mA, 200 mA, 250 mA ranges; 4.5A terminals |
Internal Technology: |
Tube (valve) based — multiple vacuum tubes visible |
Meter: |
Built-in analog V/mA panel meter |
Form Factor: |
Benchtop / Portable with carry handle |
Country/Region of Manufacture: |
Sweden |
Origin / Markings: |
Carl Olsson, Stockholm — Typ LS7C |
Asset / Reference Number: |
CVA 0267 |
Language of Markings: |
Swedish |
Seller Notes: |
Sold as-is for parts or repair; no functionality guarantee. |
Condition Notes: |
Carl Olsson OLTRO LS7C Likriktare rectifier (M2511-108010) sold as-is for parts or repair. Not tested; no functionality guarantee. Surface rust and wear on case. Tube complement present but untested. 220V. Review photos before buying. |
