Lundahl Inter stage  prices prices
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power beschrijving  model primary & secondary description afmetingen
LL 2746 1+1 : 2+2 Stepup 1:2 interstage transformer, designed for two stage amplifiers.
30mA version has 45H
1,35kg core LL2746 PP step up for 2 stage amp design Push pull version 117,61 139,95
1,35kg core LL2746 SE step up for 2 stage amp design All SE mA versions 117,61 139,95
LL2746 all versions AM cored 259,52 308,82
LL2746 all versions Silver Wound Ag version 2091,74 2489,17
LL2753 For single end to single end applications.
1,35kg core 1+1 : 1+1 LL2753 PP Se to Se applications Push pull version 117,61 139,95
1,35kg core 1+1 : 1+1 LL2753 SE Se to Se applications All SE mA versions 117,61 139,95
LL2753 all versions AM cored 259,52 308,82
LL2753 all versions Silver Wound Ag version 1565,89 1863,4
not confirmed LL2753 all versions AM cored & Ag wired 1701 2024,19
LL2756  For single end to single end applications. High impedance version compared to LL2753.
1.35kg 1+1 : 1+1 high imp compared to LL2753 Push pull version 122,47 145,73
1.35kg 1+1 : 1+1 LL2756 SE high imp compared to LL2753 All SE mA versions 122,47 145,73
1.35kg LL2756 all versions AM cored 264,38 314,61
1.35kg not confirmed LL2756 all versions Silver Wound Ag version 1565,89 1863,4
1.35kg not confirmed LL2756 all versions AM cored & Ag wired 1701 2024,19
LL2762 Modified 1660 for SE to SE applications.
0.75kg core 1+1 : 1+1 LL2762 PP modified LL1660 for Se to Se Push pull version 89,71 106,75
0.75kg core 1+1 : 1+1 LL2762 SE modified LL1660 for Se to Se All SE mA versions 89,71 106,75
0.75kg core LL2762 all versions AM cored 208,68 248,32
0.75kg core LL2762 all versions Silver Wound Ag version 1376,35 1637,85
0.75kg core LL2762 all versions AM cored & Ag wired 1494,93 1778,96
LL 2763 4+4 : 1+1+1+1  interstage transformer, based on LL1660
0.75kg core LL2763 PP step up for 2 stage amp design Push pull version 102,06 121,45
0.75kg core LL2763 SE step up for 2 stage amp design All SE mA versions 102,06 121,45
LL2763 all versions AM cored 220,64 262,56
LL2763 all versions Silver Wound Ag version 1369,54 1629,75
LL2763 all versions AM cored & Ag wired 1487,16 1769,72
LL2731  Low impedance line output transformer
0.6kg core 1+1 : 1+1 LL2731 PP low imp line output Push pull version 88,45 105,25
0.6kg core 1+1 : 1+1 LL2731 SE low imp line output All SE mA versions 88,45 105,25
0.6kg core LL2731 all versions AM cored 208,68 248,32
0.6kg core not confirmed LL2731 all versions Silver Wound Ag version 1360,8 1619,35
0.6kg core not confirmed LL2731 all versions AM cored & Ag wired 1458 1735,02
LL2745 Line output
0.75kg core 2.8+2.8 : 1+1+1+1 LL2745 PP line output Push pull version 102,06 121,45
0.75kg core 2.8+2.8 : 1+1+1+1 LL2745 SE line output All SE mA versions 102,06 121,45
0.75kg core LL2745 all versions AM cored 220,64 262,56
not confirmed LL2745 all versions Silver Wound Ag version 1533,81 1825,23
not confirmed LL2745 all versions AM cored & Ag wired 1651,42 1965,18
LL2747  Small size low impedance line output transformer, normally used 1:1
0.35kg core 2+2 : 1+1+1+1 LL2747 PP small size low imp line out Push pull version 87,48 104,1
0.35kg core 2+2 : 1+1+1+1 LL2747 SE small size low imp line out All SE mA versions 87,48 104,1
Usage LL1660 Interstage and line output.
0.75kg core 1+1+1+1 = 2.5+2.5 LL1660 PP high impedance Push pull version 89,42 106,4
0.75kg core 1+1+1+1 = 2.5+2.5 LL1660 SE high impedance All SE mA versions 89,42 106,4
0.75kg core LL1660 all versions AM cored 208 247,52
0.75kg core LL1660 all versions Silver Wound Ag version 1563,94 1861,08
0.75kg core LL1660 all versions AM cored & Ag wired 1683,5 2003,36
S version has  Internal Faraday shields for improved balance.
0.75kg core 2.5 + 2.5 : 2+2 LL1660S PP high impedance PP version 107,89 128,38
0.75kg core 2.5 + 2.5 : 2+2 LL1660S SE high impedance All SE mA versions 107,89 128,38
0.75kg core AM cored 227,1 270,24
Silver Wound Ag version 1582,41 1883,06
AM cored & Ag wired 1701 2024,19
LL1689  Line output transformer Based on the LL1660 size and structure
0.75kg core 9+9 : 1+1+1+1 LL1689 PP step down all versions Push pull version 102,06 121,45
0.75kg core 9+9 : 1+1+1+1 LL1689 SE step down all versions All SE mA versions 102,06 121,45
0.75kg core LL1689 all versions AM cored 220,64 262,56
0.75kg core LL1689 all versions Silver Wound Ag version 1575,61 1874,97
0.75kg core LL1689 all versions AM cored & Ag wired 1695,16 2017,24
0.75kg core 1+1+1+1: 9+9 LL1689S PP S = shield  Push pull version 122,47 145,73
0.75kg core 1+1+1+1: 9+9 LL1689S SE S = shield  All SE mA versions 122,47 145,73
LL1689S any version AM cored 241,05 286,84
LL1692A Interstage transformer. Compromise between the LL1660 and the LL1671.
0.75kg core 1+1+1+1 : 1.75 + 1.75 LL1692A PP med impedance PP version 89,71 106,75
0.75kg core 1+1+1+1 : 1.75 + 1.75 LL1692A SE med impedance All SE mA versions 89,71 106,75
LL1692A any version AM cored 208 247,52
LL1692A any version Silver Wound Ag version 1563,94 1861,08
LL1692A any version AM cored & Ag wired 1695,16 2017,24
LL 1671 High current interstage and line output.
0.75kg core 1+1+1+1 =  2+2 LL1671 PP low impedance PP version 88,45 105,25
0.75kg core 1+1+1+1 =  2+2 LL1671 SE low impedance All SE mA versions 88,45 105,25
LL1671 any version AM cored 208 247,52
LL1930 Mu metal core transformer for DC-free ("parafeed") line output
0.75kg core 5.8 + 5.8 : 1+1 LL1930 Mu metal core transformer  52,48 62,45
use for  DC-free parafeed line output
LL1677 High current interstage transformer (For 300B driving tube).
0.75kg core 1+1+1+1:4+4 LL1677 PP low impedance PP version 95,64 113,81
0.75kg core 1+1+1+1:4+4 LL1677 SE low impedance All SE mA versions 95,64 113,81
0.75kg core LL1677 any version AM cored 214,81 255,62
LL1621 Noninverting interstage / anode choke
0.5kg core 1+1 : 1+1 LL1621 line output  10Hz-100Khz 0.5dB Push Pull version 82,62 98,31
0.5kg core 1+1 : 1+1 LL1621 line output  10Hz-100Khz 0.5dB 6mA 130H version 82,62 98,31
0.5kg core 1+1 : 1+1 LL1621 line output  10Hz-100Khz 0.5dB 20mA 30H version 82,62 98,31
LL1630 Line output, primarily for push pull drive. The LL1630 are an old designs and not well suited for SE applications.
We recommend LL1630/5mA for push-pull preamplifier stages where some DC imbalance might occur.
0.5kg core 7.2 + 7.2 : 1 + 1 LL1630 not recommended for new designs Push Pull version 109,83 130,69
0.5kg core 7.2 + 7.2 : 1 + 1 LL1630 not recommended for new designs 6mA 130H version 109,83 130,69
0.5kg core 7.2 + 7.2 : 1 + 1 LL1630 not recommended for new designs 20mA 30H version 109,83 130,69
Interstage. Preferably push pull to push pull. The LL1635 are an old designs and not well suited for SE applications.
We recommend LL1635/5mA for push-pull preamplifier stages where some DC imbalance might occur.
The LL1635 data sheet is updated to reflect some limitations in it's use.
0.5kg core 1+1 : 1+1 LL1635 interstage tube high impedance Push Pull version 88,45 105,25
0.5kg core 1+1 : 1+1 LL1635 interstage tube high impedance 6mA 130H version 88,45 105,25
0.5kg core 1+1 : 1+1 LL1635 interstage tube high impedance 20mA 30H version 88,45 105,25
LL1680 Line output transformer Based on UTC LS-27 specifications
0.35kg core 9+9 : 1+1+1+1 LL1680 SE version  105,94 126,06
0.35kg core 9+9 : 1+1+1+1 LL1680 PP Push Pull version 105,94 126,06
0.35kg core double C core LL1654 line output 5K:600ohm 40mA version 58H inductance 109,69 130,53
0.35kg double C core LL2734 For solid state output low Z 82,85 98,59