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
Plate (anode) chokes, interstage and line output transformers
| Type | Comment | Turns ratio | Primary inductance | Recommended
DC current |
Core Saturating
DC current |
|---|---|---|---|---|---|
| LL1621/P-P | Noninverting interstage | 1+1 : 1+1 | 300H | - | - |
| LL1621/6mA | Noninverting interstage / anode choke | 1+1 : 1+1 | 130H | 6 mA | 10 mA |
| LL1635/P-P | Interstage | 1+1 : 1+1 | 300H | - | - |
| LL1635/5mA | Interstage | 1+1 : 1+1 | 130H | 5 mA | 9 mA |
| LL1635/20mA | Interstage | 1+1 : 1+1 | 30H | 20 mA | 35 mA |
| LL1630/P-P | Line output | 7.2+7.2 : 1+1 | 300 H | - | - |
| LL1630/5mA | Line output | 7.2+7.2 : 1+1 | 130 H | 5 mA | 9 mA |
| LL1660 | Interstage and line output | 1+1+1+1 : 2.5+2.5 | Application dependent | Application dependent | Application dependent |
| LL1660S | SE - PP and PP - PP Interstage
Internal Faraday shields for improved balance |
2.5+2.5 : 2 + 2 | Application dependent | Application dependent | Application dependent |
| LL1667 and LL1668 | Anode chokes | Dual coil 1+1 | Application dependent | Application dependent | Application dependent |
| LL1671 | High current interstage and line output | 1+1+1+1 : 2+2 | Application dependent | Application dependent | Application dependent |
| LL1677/80mA | High current interstage transformer
(For 300B driving tube) |
1+1+1+1 : 4+4 | 24H | 80mA (1.2 Tesla saturation) | 115mA |
| LL1680/5mA | Line output transformer
Based on UTC LS-27 specifications |
9+9 : 1+1+1+1 | 210H | 5mA | 10mA |
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 occure. 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. For SE to PP or PP to PP we recommend the new
LL1660S/PP. "S" is for the Faraday shield option, available for all 1660
types.