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Lundahl Tube Amplifier Transformers

OPTs, Mains, and interstage 

 

Non Più Disponibili - Out Of Stock

 

   

Clicca per la Guida all'uso dei trasformatori LUNDAHL

Carta di scelta rapida dei Trasformatori Lundahl    Short Form Function List 

 

 

Non Più Disponibili - Out Of Stock

 

Type

Euro Unit

Italia & CE

Tax included

Euro Unit

Extra CE

Without Tax
LL1527XL 65,07 54,23
LL1544A 54,68 45.57
LL1620/PP 178,22 148.52
LL1620/40mA 178,22 148.52
LL1620/60mA 178,22 148.52
LL1620/80mA 178,22 148.52
LL1620/90mA 178,22 148.52
LL1620/100mA 178,22 148.52
LL1620/120mA 178,22 148.52
LL1620AM (any versions) 311,86 259.89
LL1620CFB (any versions) 195,96 163.30
LL1621/PP 78,00 65.00
LL1621/6mA       (4) 78,00 65.00
LL1621/10mA 78,00 65.00
LL1621/20mA      (4) 78,00 65.00
LL1621/40mA 78,00 65.00
LL1621/60mA 78,00 65.00
LL1621/100mA 78,00 65.00
LL1623/PP 178,22 148.52
LL1623/60mA      (4) 178,22 148.52
LL1623/70mA 178,22 148.52
LL1623/90mA 178,22 148.52
LL1623/100mA 178,22 148.52
LL1623/120mA       (2) 178,22 148.52
LL1623/140mA 178,22 148.52
LL1623/160mA 178,22 148.52
LL1623/180mA 178,22 148.52
LL1623/200mA 178,22 148.52
LL1623/250mA 178,22 148.52
LL1623AM (any ver sions) 311,86 259.89
LL1627/PP        (4) 178,22 148.52
LL1627/90mA    (4) 178,22 148.52
LL1627/120mA 178,22 148.52
LL1627/140mA 178,22 148.52
LL1627/185mA 178,22 148.52
LL1627/220mA 178,22 148.52
LL1627AM (any versions) 311,86 259.89
LL1630/PP      (2) 104,04 86.70
LL1630/5mA 104,04 86.70
LL1630/10mA 104,04 86.70
LL1630/20mA 104,04 86.70
LL1635/PP     (10) 83,18 69.32
LL1635/5mA 83,18 69.32
LL1635/6.5mA 83,18 69.32
LL1635/10mA 83,18 69.32
Type

Euro Unit

Italia & CE

Tax included

Euro Unit

Extra CE

Without Tax
LL1635/20mA       (6) 83,18 69.32
LL1635/40mA 83,18 69.32
LL1636      (4) 57,79 48.16
LL1638/4H 78,00 65.00
LL1638/5H 78,00 65.00
LL1638/8H 78,00 65.00
LL1638/10H 78,00 65.00
LL1638/20H 78,00 65.00
LL1638/40H 78,00 65.00
LL1648 141,00 117.50
LL1649 141,00 117.50
LL1650 141,00 117.50
LL1651 141,00 117.50
LL1654/40mA 149,76 124.60
LL1660/PP 84,40 70.34
LL1660/5mA    (6) 84,40 70.34
LL1660/10mA 84,40 70.34
LL1660/12mA 84,40 70.34
LL1660/18mA 84,00 70.34
LL1660/25mA 84,00 70.34
LL1660/30mA 84,00 70.34
LL1660/36mA 84,00 70.34
LL1660/40mA 84,00 70.34
LL1660/50mA 84,00 70.34
LL1660S/PP 84,00 70.34
LL1660S/5mA 99,68 83.07
LL1660S/10mA 99,68 83.07
LL1660S/12mA 99,68 83.07
LL1660S/18mA 99,68 83.07
LL1660S/25mA 99,68 83.07
LL1660S/30mA 99,68 83.07
LL1660S/36mA 99,68 83.07
LL1660S/40mA 99,68 83.07
LL1660S/50mA 99,68 83.07
LL1662 141,00 117.50
LL1663/PP 110,72 92.27
LL1663/30mA 110,72 92.27
LL1663/50mA 110,72 92.27
LL1663/75mA 110,72 92.27
LL1663/100mA     (6) 110,72 92.27
LL1664/PP 110,72 92.27
 

 

 

 

 

Type

Euro Unit

Italia & CE

Tax included

Euro Unit

Extra CE

Without Tax
LL1664/50mA 110,72 92.27
LL1664/60mA 110,72 92.27
LL1664/80mA 110,72 92.27
LL1664/100mA 110,72 92.27
LL1665 141,00 117.50
LL1667/5mA 78,00 65.00
LL1667/15mA 78,00 65.00
LL1667/25mA 78,00 65.00
LL1668/25mA 74,31 61.93
LL1668/30mA 74,31 61.93
LL1668/40mA 74,31 61.93
LL1668/50mA 74,31 61.93
LL1668/60mA 74,31 61.93
LL1669A 149,72 124.77
LL1670/0.8mA 65,86 54.89
LL1671/PP    (4) 83,18 69.32
LL1671/30mA 83,18 69.32
LL1671/50mA 83,18 69.32
LL1671/65mA 83,18 69.32
LL1673/7H 78,00 65.00
LL1673/10H 78,00 65.00
LL1673/15H 78,00 65.00
LL1673/20H 78,00 65.00
LL1674 84,13 70.11
LL1676    (4) 84,13 70.11
LL1677/80mA 90,00 75.00
LL1678 48,91 40.76
LL1679 180,81 150.68
LL1679AM (any versions) 314,59 262.16
LL1680/5mA 99,96 83.30
LL1681    (2) 78,81 65.68
LL1682/PP 121,77 101.48
LL1682/50mA 121,77 101.48
LL1682/100mA 121,77 101.48
LL1683 141,00 117.50
LL1683 141,00 117.50
LL1684 80,72 67.27
LL1685/100mA 71,31 59.43
LL1685/130mA 71,31 59.43
LL1688/PP 267,13 222.61
LL1688/70mA 267,13 222.61
LL1689 96,00 80.00
LL1922   (4) 75,80 71,21
LL7901 101,46 97,23
LL7902 101,46 97,23
LL7903    (4) 97,36 81.14
LL7905 100,62 83.86
LL9202/PP 178,22 148.52
LL9202/50mA 178,22 148.52
LL9202/85mA 178,22 148.52
LL9202AM (any versions) 311,86 259.89
LL9206    (2) 53,31 44.43

 

Non Più Disponibili - Out Of Stock

 

 

Output transformers
 
The LL1620, LL1623, LL1627 and LL9202 are Lundahl' largest OPTs.
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 on line datasheet (pdf format) for more complete information.
 
The LL1679 is the newest output transformer for tube amplifiers. It is designed with ultra-linear connection in mind (36%). It is highly sectioned with armonically sized sections, with result in a minimum leakage inductance. This, combined with low capacitances results in a wide frequency range.
 

Push-Pull. 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 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
LL9202 1180V - 570H C 11.0k 0.5 125W
LL1679 670V - 150H C 4.5k 0.4 105W
 

Single-End. Voltage (RMS) and power @ 30 Hz
 
Typ 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
LL9202 525V 85mA 57H C 11.0k 0.5 25W
LL1679 295V 85mA 30H C 4.5k 0.4 20W
 
*) "Secondary connection alt." refers to connection alternatives shown in the on line datasheet (pdf format) .
In order to easify interconnection of secondaries, Lundahl manufactured PCB boards with patterns for the most often used output alternatives.
 
Small output transformers
 
The LL1663 and the LL1664 are OPTs with a less flexible structure (and thus much easier to use) than the types above.
 
The LL1663 is a 5k:8 ohms output transformer available in PP or SE versions. Primary winding can be tabbed for 31% ultralinear connection.
 
The LL1664 is a 3k:8 ohms output transformer also available in PP or SE versions. Primary winding can be tabbed for 31% ultralinear connection.
 
LL1682 is the latest output transformer for tube amplifiers. The transformer is a four sectioned dual coil C-core for 5.5k:5 ohms impedance ratio available. Primary winding can be tapped for 33% ultralinear connection.
 

Push-Pull. Voltage (RMS) and power @ 30 Hz
 
Type Max Prim. Voltage DC current Inductance Secondary *
connection alt.		 Prim. Z @ 8 ohms load Loss, dB Power
LL1663 450V - - C 5.0k - 40W
LL1664 410V - - C 3.0k - 55W
LL1682 450V - - C 5.5k @ 5 ohm - 40W
 
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
LL1663 450V - - C 5.0k - 40W
LL1664 410V - - C 3.0k - 55W
LL1682 450V - - C 5.5k @ 5 ohm - 40W
 
 

Transformer for 845 and 211 vacuum tubes
 
The LL1688 is an output transformer designed primarly for 845 tube amplidier. It is available with different core air-gap. The Primary winding can be tapped for 33% ultra linear connection (this feature is on request).
 
Push pull. Voltage (RMS) and power @ 30 Hz
 
Type Max Prim. Voltage DC current Inductance Secondary *
connection alt.		 Prim. Z @ 8 ohms load Loss, dB Power
LL1688 1220V - - C 9.2k 0.25 160W
 
Single ended. Voltage (RMS) and power @ 30 Hz
 
Type Max Prim. Voltage DC current Inductance Secondary *
connection alt.		 Prim. Z @ 8 ohms load Loss, dB Power
LL1688 530V - - C 9.2k 0.25 30W
 

Mains transformers
 
In Lundahl 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 - 250VAC, in parallel for 105 - 125VAC. Table entries are calculated for primary voltage 230VAC.
 
Type Secondary #1 Secondary #2 & #3 Secondary #4 & #5 Secondary #6 & #7
LL1648 350V 5.9V@3.1A 6.6V@3.1A  
LL1649 230V 6.6V@3.1A 6.6V@3.1A  
LL1650 350V 6.6V@3.1A 6.6V@3.1A  
LL1651 500V 6.6V@3.1A 6.6V@3.1A  
 
Type Secondary #1 & #2 Secondary #3 Secondary #4 & #5 Secondary #6 & #7
LL1683 250V@80mA 48V@100mA 6.6V@3.0A 5.2V@3.0A
 
NOTE: Please study a very smart hybrid power supply principle. This principle avoids the very high voltage of an all tube rectifier and uses the transformer more efficiently.
 

Chokes for tube amp power supply
 
Type Inductance Rec. DC current Saturating current
LL1638/4H 4 H 400mA 575 mA
LL1638/8H 8 H 200mA 290 mA
LL1638/10H 10 H 150 mA 215 mA
LL1673/10H 10 H 200 mA 298 mA
LL1673/15H 15 H 140 mA 200 mA
LL1673/20H 12 H 100 mA 145 mA
LL1685/100mA 17 H 100 mA 145 mA
LL1685/130mA 13 H 130 mA 190 mA
LL1685/160mA 10 H 160 mA 230 mA
 

Anode chokes, line input, interstage and line output transformers
 
Type Note Turns ratio Primary inductance Recommended
DC current		 Core Saturating
DC current
LL1621/PP Noninverting interstage 1+1 : 1+1 300H - -
LL1621/6mA Noninverting interstage / anode choke 1+1 : 1+1 130H 6 mA 10 mA
LL1630/PP 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
LL1635/PP 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
LL1660 Interstage and line output 1+1+1+1 : 2.5+2.5 Application dependent Application dependent Application dependent
LL1660S Interstage and line output 1+1+1+1 : 2.5+2.5 Application dependent Application dependent Application dependent
LL1667 Anode choke Dual coil 1+1 Application dependent Application dependent Application dependent
LL1668 Anode choke Dual coil 1+1 Application dependent Application dependent Application dependent
LL1670 Grid choke Single center tapped coil Application dependent Application dependent Application dependent
LL1671/PP High current interstage/line output 1+1+1+1 : 2+2 Application dependent Application dependent Application dependent
LL1671/30mA High current interstage/line output 1+1+1+1 : 2+2 Application dependent Application dependent Application dependent
LL1671/50mA High current interstage/line output 1+1+1+1 : 2+2 Application dependent Application dependent Application dependent
LL1674 Amorphous core line input 1+1 : 4+4 Application dependent Application dependent Application dependent
LL1676 Amorphous core line input 1+1 : 2+2 Application dependent Application dependent Application dependent
LL1677 High current interstage 1+1+1+1 : 4+4 Application dependent Application dependent Application dependent
LL1680 UTC LS-27 replica. Line output. 9+9 : 1+1+1+1 210 H 5 mA > 5 mA
LL1922 UTC LS-10 replica. Line input. 1+1 : 4+4 - - -
LL7901 Line input/general purpose 1+1+1+1 : 1+1+1+1 Application dependent Application dependent Application dependent
LL7902 Line input/general purpose 1+1+1+1 : 1+1+1+1 Application dependent Application dependent Application dependent
LL7903 Microphone input 1+1+1+1 : 2+2+2+2 Application dependent Application dependent Application dependent
LL7905 High turn ratio, high level input 1+1+1+1 : 5.6+5.6 Application dependent Application dependent Application dependent
 
NOTE 1: all types above can be gapped for other DC current than listed.
NOTE 2: it is 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.
NOTE 3: for most SE applications, the LL1660 outperforms the LL1630 and LL1635.
NOTE 4: for low current (5mA) SE applications, the LL1660/PP can be used as it is gapped. So, in single ended connection, it can be considered the same as a LL1660/5mA.
 

General purpose transformers
 
Type Note Turns ratio Primary inductance Recommended
DC current		 Core Saturating
DC current
LL1527XL General purpose 1+1 : 1+1 - - -
LL1544A General purpose 1+1+1+1 : 2+2 - - -
 

Moving coil input transformer
 
Type Note Turns ratio Primary inductance Recommended
DC current		 Core Saturating
DC current
LL1636 Microphone, DI-Box, MC input. With electrostatic screen. 1+1+1+1 : 10+10 - - -
LL1678 MC input. NO electrostatic screen. 1+1+1+1 : 16+16 - - -
LL1681 MC input. With electrostatic screen. 1+1+1+1 : 13+13 - - -
LL9206 MC input. NO electrostatic screen. 1+1+1+1 : 10+10 - - -

 

Non Più Disponibili - Out Of Stock

venerdì 20 giugno 2008

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