Manufacturer of  Ultra High Quality Audio Transformers

Product Overview:

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

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

"Secondary connection alt." refers to connection alternatives shown in the (pdf format) on line datasheet.

• In order to easify interconnection of secondaries, we have manufactured PCB boards with patterns for the most often used output alternatives.
• Sometimes you need to more easily switch between different output impedances on our output transformers LL1620, LL1623 and LL1627. This sheet suggests two different wiring alternatives where the OPT secondary is reconnected using only three jumpers.

The LL1663, LL1664 and LL1682 are new OPTs with a less flexible structure (and thus much easier to use) than the types above.

1. The LL1663 is a 5k:8 ohms output transformer available in PP or SE versions
2. The LL1664 is a 3k:8 ohms output transformer also available in PP or SE versions
The LL1682 is a 5.5k:5 ohms output transformer also available in PP or SE versions

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