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Other tube amplifier transformers

 
     
 
Tube Amplifier
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MC and line input transformers, interstage and line output transformers, chokes and mains transformers.

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Moving coil input transformers
Transformers for input and DC-decoupled line output applications
Anode chokes, interstage and line output transformers
Mains transformers
Chokes for tube amp power supply
Filament current chokes
 
     
  Moving coil input transformers  
     
 
Type Turns ratio Size
(LxWxH mm)
Application Application examples  
 
LL1678 1+1+1+1 : 16+16 30x22.5x14.5 MC input Moving coil input 1:8, 1:16 or 1:32 .
For low and medium impedance cartridges
 
LL1681 1+1 : 13+13 48x29x20 MC input Moving coil input 1:13 or 1:26 .
Mu-metal core. Internal Faraday shiled.
For low and medium impedance cartridges.
 
LL1931 1+1 : 8+8 43x28x22 MC input Prestigious moving coil transformer, 1:8 or 1:16.
Cardas Audio copper and Lundahl Amorphous strip core.
For medium and high impedance cartridges.
 
LL1931Ag 1+1 : 8+8 43x28x22 NEW!
MC input
Super prestigious moving coil transformer, 1:8 or 1:16.
High purity silver wire and Lundahl Amorphous strip core.
For medium and high impedance cartridges.
 
LL1933 1+1 : 8+8 47x28x24 MC input Prestigious moving coil transformer, 1:8 or 1:16.
Cardas Audio copper and classic Permalloy lamination core.
For medium and high impedance cartridges.
 
LL1933Ag 1+1 : 8+8 47x28x24 NEW!
MC input
Super prestigious moving coil transformer, 1:8 or 1:16.
High purity silver wire and classic Permalloy lamination core.
For medium and high impedance cartridges.
 
LL1941 1+1 : 16+16 43x28x22 MC input Prestigious moving coil transformer, 1:16 or 1:32.
Cardas Audio copper and Lundahl Amorphous strip core.
For low and medium impedance cartridges.
 

LL1941Ag

1+1 : 16+16 43x28x22 NEW!
MC input
Super prestigious moving coil transformer, 1:16 or 1:32.
High purity silver wire and Lundahl Amorphous strip core.
For low and medium impedance cartridges.
 
LL1943 1+1 : 16+16 47x28x24 MC input Prestigious moving coil transformer, 1:16 or 1:32.
Cardas Audio copper and classic Permalloy lamination core.
For low and medium impedance cartridges.
 
LL1943Ag 1+1 : 16+16 47x28x24 NEW!
MC input
Super prestigious moving coil transformer, 1:16 or 1:32.
High purity silver wire and classic Permalloy lamination core.
For low and medium impedance cartridges.
 
LL9206 1+1+1+1 : 10+10 30x22.5x14.5 MC input Moving coil input 1:5, 1:10 or 1:20.
For medium and high impedance cartridges.
 
LL9226 1+1+1+1 : 10+10 30x22.5x14.5 MC input Moving coil input 1:5, 1:10 or 1:20.
Improved version of LL9206.
For medium and high impedance cartridges.
 
       
 
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  Transformers for input and DC-decoupled line output applications  
     
 
Type Turns ratio Size
(LxWxH mm)
Application Application examples  
 
LL1674 1+1 : 4+4 43x28x21 Line input/output Amorphous core line input/output transformer
 
LL1676 1+1 : 2+2 43x28x21 Line input/output Amorphous core line input/output transformer
 
LL1684 1+1 : 1+1 42x28x22 High level general purpose For high level, low impedance applications such as (DC-decoupled) line output.
The transformer is not suitable for line input from high impedance signal sources.
 
LL1690 1+1 : 1+1 42x28x22 High level line input For high level, high impedance applications such as (DC-free) line input.
 
LL7903 1+1+1+1 : 2+2+2+2 66x32x21 Mic or line input 200 : 13 k ohms (used 1:8)
This is the ultimate microphone input transformer, designed for high quality tube equipment.
 
LL7905 1+1+1+1 : 5.6 + 5.6 66x32x21 High stepup input High level 600 ohms tube amplifier mic/line input (used 2 : 11.2) Can also be used as a (DC-decoupled) line output transformer
 
       
 
     
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  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  
 
LL1635/P-P Interstage 1+1 : 1+1 300H -  
 
LL1635/5mA Interstage 1+1 : 1+1 130H 5 mA  
 
LL1635/20mA Interstage 1+1 : 1+1 30H 20 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  
 
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
 
LL1689 Line output transformer
Based on the LL1660 size and structure
9+9 : 1+1+1+1 Application dependent Application dependent Application dependent
 
LL1692A Interstage transformer
Compromise between the LL1660 and the LL1671
1.75 + 1.75 : 1+1+1+1 Application dependent Application dependent Application dependent
 
LL2731 Low impedance line output transformer 1+1 : 1+1 Application dependent Application dependent Application dependent
 
LL1930 Mu metal core transformer for DC-free ("parafeed") line output 5.8 + 5.8 : 1+1 Not applicable Not applicable Not applicable
 
LL2743 Anode choke Dual coil 1 : 1 64H 70mA 110mA
 
         
 
     
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Mains transformers

In our C-core mains transformers, a very small air-gap is used to compensate for any DC unbalance in the mains outlet. Secondary voltages listed are no-load voltages.

Voltage drop because of load is to be calculated from transformer copper resistance and load current. Electrical size is estimated to 250VA, which can be increased with good cooling. For optimal use, about 75% of power should be taken from secondary 1.

Primaries should be connected in series for 210 - 250 V, in parallel for 105 - 125V. Table entries are calculated for primary voltage 230 V.

 
     
     
 
Type Secondary 1 Secondary 2 and 3 Secondary 4 and 5 Secondary 6  
 
LL1648 350V 5.9V 6.6V -
 
LL1649 230V 6.6V 6.6V -
 
LL1650 350V 6.6V 6.6V -
 
LL1651 500V 6.6V 6.6V -
 
LL1683 250V / 0.16A 6.6V / 3A 5.2V / 3A 48V / 0.1A
 
       
 
     
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  Chokes for tube amp power supply  
     
 
Type Inductance Rec. DC current Saturating current DC resistance  
 
LL1638/4H 4H 400 mA 575 mA 36 ohms
 
LL1638/8H 8H 200 mA 290 mA 36 ohms
 
LL1638/10H 10H 150 mA 215 mA 36 ohms
 
LL1673/10H 10H 200 mA 290 mA 60 ohms
 
LL1673/15H 15H 140 mA 200 mA 60 ohms
 
LL1673/20H 20H 100 mA 145 mA 60 ohms
 
LL1685/100mA 17H 100 mA 145 mA 130 ohms
 
LL1685/160mA 10H 160 mA 230 mA 130 ohms
 
       
 
     
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  Filament current chokes  
     
 
Type Inductance Rec. DC current Saturating current DC resistance  
 
LL1694/1.5A 0.16H 1.5 A 2.2 A 2 ohms
 
LL1694/1.5A (parallel) 40 mH 3 A 4.4 A 0.5 ohms
 
LL2733/1.7A 0.4H 1.7 A 2.7 A 3.4 ohms
 
LL2733/1.7A (parallel) 0.1H 3.4 A 5.4 A 0.9 ohms
 
       
 
     
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