Introduction
Input (and DC-free line output)
applications
Plate (anode) chokes,
interstage and line output
Push-Pull
and SE
Chokes for Power Supply
Mains transformers
Miscellanious Products
Amorphous cores
Some Pictures
Storage
PP and SE Output transformers.
The LL1620, LL1623 and LL1627 are our largest OPTs. (We can not make bigger transformers without rebuilding our production machines) All types are made with the same size silicon iron C-core, and all types have the same secondary winding topology, but different primary windings.
Each type can be used for a number of different primary impedance levels
by using different secondary terminations.
The transformers are available in push-pull or singel end versions
with different core air-gap for different DC currents.
The transformers are highly sectioned (in all 10 sections) for excellent
frequency response.
The use of C-cores and well defined air-gaps results in an almost constant inductance throughout the whole operating voltage range. For SE transformers, the primary inductance has decreased less than 7% for a max power signal according to the table below.
The tables below displays only a few of many possible uses. Please refer to the datasheets for more complete information.
Push-Pull. Voltage (RMS) and power @ 30 Hz
| Type | Max Prim. Voltage | Inductance | Secondary*
connection alt. |
Prim. Z @ 8 ohms load | Loss, dB | Power |
|---|---|---|---|---|---|---|
| LL1627 | 380V | 60H | C | 1.2k | 0.5 | 125W |
| LL1623 | 610V | 150H | C | 3.0k | 0.5 | 125W |
| LL1620 | 860V | 300H | C | 6.0k | 0.5 | 125W |
| LL1679 (w. UL) | 670V | 150H | C | 4.5k | 0.4 | 105W |
APPLICATION
HELP: How to select a Transformer
APPLICATION
HELP: Some examples of tranformer-tube combinations
Single-End. Voltage (RMS) and power @ 30 Hz
| Type | Max Prim. Voltage | DC current | Inductance | Secondary*
connection alt. |
Prim. Z @ 8 ohms load | Loss, dB | Power |
|---|---|---|---|---|---|---|---|
| LL1627 | 170V | 140mA | 12H | C | 1.2k | 0.5 | 25W |
| LL1623 | 270V | 90mA | 30H | C | 3.0k | 0.5 | 25W |
| LL1620 | 380V | 60mA | 60H | C | 6.0k | 0.5 | 25W |
| LL1679 (w. UL) | 295V | 70mA | - | C | 4.5k | 0.4 | 20W |
The LL1663, LL1664 and LL1682 are new OPTs with a less flexible structure (and thus much easier to use) than the types above.