| Type |
Appliction |
Turns Ratio |
Size(LxWxH mm) |
Application examples and comments |
PDF |
Moving coil input transformers |
|
MC input |
1+1+1+1 : 10+10 |
30x22.5x14.5 |
Moving coil input 1:5, 1:10 or 1:20.
(No electrostatic shields) |
|
|
MC input |
1+1+1+1 : 16+16 |
30x22.5x14.5 |
Moving coil input 1:8, 1:16 or 1:32 .
(No electrostatic shields) |
|
|
MC input |
1+1 : 13+13 |
48x29x20 |
Moving coil input 1:13 or 1:26 .
Mu-metal core. |
|
| Transformers for input (and DC-free line output) applications |
|
Line input/output |
1+1 : 4+4 |
43x28x21 |
Amorphous core line input/output transformer
|
|
|
Line input/output |
1+1 : 2+2 |
43x28x21 |
Amorphous core line input/output transformer
|
|
|
Mic or line input |
1+1+1+1 : 2+2+2+2 |
66x32x21 |
200 : 13 k ohms (used 1:8)
This is the ultimate microphone input transformer, designed for high quality tube equipment. |
|
|
High stepup input |
1+1+1+1 :
5.6 + 5.6 |
66x32x21 |
High level 600 ohms tube amplifier mic/line input (used 2 : 11.2)
Can also be used as a (DC-free) line output transformer |
|
|
High level general purpose |
1+1 : 1+1 |
42x28x22 |
For high level, low impedance applications such as (DC-free) line output
The transformer is NOT suitable for line input unless the source is low impedance. |
|
Anode chokes, interstage and line output transformers
NOTE1! All types above can be gapped for other DC current than listed
NOTE2! We recommend LL1630/5mA and LL1635/5mA for push-pull preamplifier stages where some DC imbalance
occurs. The LL1635 data sheet is updated to reflect some limitations in it's use.
NOTE3! For most SE applications, the LL1660 outperforms the LL1630 and LL1635
|
| Type |
Turns ratio |
Core Saturating
DC current |
Recommended
DC current |
Comment |
PDF |
|
1+1 : 1+1 |
- |
- |
Noninverting interstage |
|
|
1+1 : 1+1 |
10 mA |
6 mA |
Noninverting interstage / anode choke |
|
|
1+1 : 1+1 |
- |
- |
Interstage |
 |
|
1+1 : 1+1 |
9 mA |
5 mA |
Interstage |
|
|
1+1 : 1+1 |
35 mA |
20 mA |
Interstage |
|
|
7.2+7.2 : 1+1 |
- |
- |
Line output |
|
|
7.2+7.2 : 1+1 |
9 mA |
5 mA |
Line output |
|
|
1+1+1+1 : 2.5+2.5 |
Application dependent |
Application dependent |
Interstage and line output |
|
|
2.5+2.5 : 2 + 2 |
Application dependent |
Application dependent |
SE - PP and PP - PP Interstage
Internal Faraday shields for improved balance |
|
|
Dual coil 1+1 |
Application dependent |
Application dependent |
Anode chokes |
|
|
1+1+1+1 : 2+2 |
Application dependent |
Application dependent |
High current interstage and line output |
|
|
1+1+1+1 : 4+4 |
115mA |
80mA (1.2 Tesla saturation) |
High current interstage transformer
(For 300B driving tube) |
|
|
9+9 : 1+1+1+1 |
10mA |
5mA |
Line output transformer
Based on UTC LS-27 specifications |
|
|
9+9 : 1+1+1+1 |
Application dependent |
Application dependent |
Line output transformer
Based on the LL1660 size and structure |
|
Output transformers. The LL1620, LL1623, LL1627 and LL9202 is a range of tube output transformers based on the same core size and winding topology. The range share the same high quality silicon iron C-core and have identical secondary windings. They differ only in the number of turns of the 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 airgaps results in an almost constant inductance throughout the whole operating voltage range. For SE transformers, the primary inductance variation due to signal level is less than 7% The tables below displays only a few of many possible uses. Please refer to the full datasheets for more complete information.
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