Single Ended

Output transformers suitable for operation in Single Ended mode, predestined to work with vacuum tube in a single-ended topology, are produced based on EI or CC cores, with a slit (a gap). The maximum power of such transformers is 100 W. The impedance of the anode windings can range from several hundred ohms up to 10 kohms. It is possible to disengage the ultra-linear tapping. Load Resistances can be: 4, 6, 8 and 16Ω, or any combination thereof.

The frequency response is within a range from 10 Hz to 60 kHz at a -3 dB loss, and with a range of 20 Hz to 20 kHz complying with a ± 1 dB uniformity.

These SE output transformers can be made-​​to-order, with a minimum-order-quantity of one SINGLE item, as requested and according to the customers specification and description.

But our offering also includes "ready-made", standard, "off-the-shelf" SE transformers, executed according to our own designs, and based upon multiple years of experience in this field. The descriptions of such ready SE transformers are given below. The descriptions of the meaning of the values and the abbreviated parameters are given alongside in a table with explanations. Such off-the-shelf SE transformers are intended to be used in systems focused on a specific type of output vacuum tube. Such transformers can also be used to work with other tubes, provided the calculations match.

As each transformer is designed for a specific tube and it's application, our valued customer has full control upon the choice of the best preferred vacuum tubes to be used and decides on the optimal operation point and work conditions of such selected tube. This can be decided upon independently, on the basis of the "existing rules" that apply here.

If our customer is not sure as to what tube to select, and what operating point to use, we will be more than happy to support him in making an optimal choice, based on our knowledge and multiple years of experience in this respect. We shall help our customer choose and tailor an optimal design of the transformer, for the tube of choice.

The LO SE series of transformers feature a solid construction, special mounting brackets with feed adapted for easy installation, excellent application properties and a very attractive quality - price relationship. Please have a look at our finished products.
  • LO SE25-3

    LO SE25-3

    LO SE25-3

    The transformer is made on the annealed cores, thickness of laminations 0.3 mm . Fits to the transformer cover shield OT-14 (accessories section). Ideal for amplifiers on 300B tubes and EL34.

    view details LO SE25-3
  • LO SE50-3

    LO SE50-3

    LO SE50-3

    The transformer is made on the annealed cores, thickness of laminations 0.3 mm . ideal for amplifier 300B, EL34, KT88.

    view details LO SE50-3
  • LO SE25-5

    LO SE25-5

    LO SE25-5

    The transformer is made on the annealed cores, thickness of laminations 0.3 mm . ideally suited to build a SE amp on 300B tubes, EL34 and KT88.

    view details LO SE25-5
  • LO SE50-1

    LO SE50-1

    LO SE50-1

    Transformer wound on a core CC, ideal for the construction of the amplifier to the wonderful both sonically and visually lamp 6C33C-b.

    view details LO SE50-1
  • LO SE100-1

    LO SE100-1

    LO SE100-1

    Ideal for amplifiers on GM70 tubes and 845 or 211. The transformer is made on the annealed cores, thickness of laminations 0.3 mm .

    view details LO SE100-1

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