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Transformer

Push-pull tube amplifier output transformers

XPP Series Push-pull tube amplifier output transformers

with a full frequency range of 70 to 18K Hz.

MODEL Max Input Primary Secondary Screen/Grid
XPP15-8-8K 15W 8K Ohms 8 Ohms 40%

 

CXPP Series Push-pull tube amplifier output transformers

with a full frequency range of 20 to 20K Hz

MODEL Max Input Primary Secondary Screen/Grid
CXPP25-MS-8K 25W 8K Ohms 4,8,16 Ohms 40%
CXPP25-8-8K 25W 8K Ohms 8 Ohms 40%
CXPP25-8-5K 25W 5K Ohms 8 Ohms 40%
CXPP50-8-3.4K 50W 3.4K Ohms 8 Ohms 40%
CXPP50-8-6.6K 50W 6.6K Ohms 8 Ohms 40%
CXPP100-MS-1.7K 100W 1.7K Ohms 4,8,16 Ohms 40%

 

GXPP Series Push-pull tube amplifier output transformers

with a full frequency range of 40 to 18K Hz

MODEL

Max Input

Primary

Secondary

Screen/Grid

GXPP15-8-10K

15W

10K Ohms

8 Ohms

40%

GXPP15-8-5K

15W

5K Ohms

8 Ohms

40%

GXPP15-8-8K

15W

8K Ohms

8 Ohms

40%

 

Single Ended Tube Output Transformers

XSE Series Single ended tube amplifier transformers

with a full frequency range of 70 to 18K Hz

MODEL Max Input Primary Secondary Screen/Grid
XSE10-8-3K 10W 3K Ohms 8 Ohm 40%
XSE10-8-5K 10W 5K Ohms 8 Ohm 40%
XSE15-8-2.5K 15W 2.5K Ohms 8 Ohm 40%
XSE15-8-3.5K 15W 3.5K Ohms 8 Ohm 40%
XSE15-8-5K 15W 5K Ohms 8 Ohm 40%

 

CXSE Series Single ended tube amplifier output transformers

with a full frequency range of 20 to 20K Hz

MODEL Max Input Primary Secondary Screen/Grid
CXSE25-8-2.5K 25W 2.5K Ohms 8 Ohm 40%
CXSE25-8-3.5K 25W 3.5K Ohms 8 Ohm 40%
CXSE25-8-5K 25W 5K Ohms 8 Ohm 40%
CXSE25-8-6.5K 25W 6.5K Ohms 8 Ohm 40%

 

 

GXSE Series Single ended tube amplifier output transformers

with a full frequency range of 40 to 18K Hz

MODEL Max Input Primary Secondary Screen/Grid
GXSE10-8-2.5K 10W 2.5K Ohms 8 Ohm 40%
GXSE10-8-5K 10W 5K Ohms 8 Ohm 40%
GXSE15-8-2.5K 25W 2.5K Ohms 8 Ohm 40%
GXSE15-8-5K 25W 5K Ohms 8 Ohm 40%
GXSE15-8-8K 25W 8K Ohms 8 Ohm 40%

 

Signal Matching Transformers

WSM Matchers Series Signal level matching transformers

MODEL Max Input Primary Secondary Turn Ratio
WSM10K/600 0.5W 10K Ohms 600 Ohms 4.1:1
WSM15K/600 0.5W 15K Ohms 600 Ohms 5:1

XSM Series 2-1/2W matching transformers

MODEL Max Input Primary Secondary Turn Ratio
XSM10K/600 2.5W 10K Ohms 600 Ohms 4.1:1
XSM15K/600 2.5W 15K Ohms 600 Ohms 5:1
XSM600/10K 2.5W 600 Ohms 10K Ohms 1:4.1
XSM600/15K 2.5W 600 Ohms 15K Ohms 1:5
XSM500/600 2.5W 600 Ohms 600 Ohms 1:1

 

Tube Amplifier Power Transformers

Model Description Picture Diagram
PWR012-240240Vrms, 50/60Hz 350V(175-0-175)@100mA, 6.3V(3.15-0-3.15)@2A & 5V@2A
PWR083-120/240Vrms, 50/60Hz 200V@40mA & 8V@1.5A

XPWR068-240240Vrms, 50/60Hz 400V(200-0-200)@150mA, 6.3V@2.5A & 6.3V@2.5A

 

Single Ended Power Amp Output  ( Secondary Impedance 4,8,16 )

Model Current Impedance Power Frequency  Recommended  Dimension Weight 
Pri DC B-P Response Tubes Style ( kg )
JS-6123H 120mA 2.5K/3.5K/5K 20W 15Hz-70KHz-2dB 2A3 / 300B / 6V6  F  3.2
JS-6130H 350mA 600W 30W  15Hz-80KHz-2dB  6336 / 6C33 / 6AS7  E  4.8
JS-6132H 120mA  2.5K 30W  15Hz-90KHz-2dB  300B / 6L6 / 2A3  D  4.8
JS-6133H 120mA  3.5K 30W  15Hz-90KHz-2dB  300B / 12E1 / EL34  D  4.8
JS-6135H 120mA  3.5K/5K/7K 30W  15Hz-45KHz-2dB  300B / 211 / 845  D 4.8
JS-6157H 140mA  5K/7K 50W  20Hz-54KHz-2dB  211 / 845 C  5.6
JS-6159H 120mA  10K 50W  20Hz-54KHz-2dB  211 / 845 A 6.9

Push-Pull Power Amp Output  ( Secondary Impedance 4,8,16)

Model Current  Impedance  Power Frequency  Dimension Weight 
Pri DC Zp ( PP ) Response Style ( kg )
JS-6223H  90mA 3.4K   20W  10Hz-80KHz-1dB F  2.4
JS-6225H  90mA 5K   20W  10Hz-60KHz-1dB  F  2.4
JS-6226H  90mA 6.6K   20W  10Hz-60KHz-1dB  F  2.5
JS-6228H  90mA 8K   20W  10Hz-60KHz-1dB  F  2.6
JS-6233H  100mA  3.4K ( SG CT )  30W  10Hz-100KHz-1dB  E  2.8
JS-6235H  100mA 5K ( SG CT )   30W  10Hz-80KHz-1dB  E  3.1
JS-6236H  100mA 6.6K ( SG CT )   30W  10Hz-80KHz-1dB  E  3.1
JS-6238H 100mA 8K ( SG CT ) 30W 10Hz-70KHz-1dB E 3.1
JS-6253H 160mA 3.4K ( SG CT ) 50W 10Hz-100KHz-1dB D 4.8
JS-6255H 160mA 5K ( SG CT ) 50W 10Hz-80KHz-1dB D 4.8
JS-6256H 160mA 6.6K ( SG CT ) 50W 10Hz-80KHz-1dB D 4.8
JS-6258H 160mA 8K ( SG CT ) 50W 10Hz-70KHz-1dB D 4.8
JS-6273HF 200mA 3.4K ( SG CT ) 70W 10Hz-100KHz-1dB B 6.8
JS-6274HF 200mA 4.5K ( SG CT ) 70W 10Hz-80KHz-1dB B 6.8
JS-6275HF 200mA 5K ( SG CT ) 70W 10Hz-80KHz-1dB B 6.8
JS-6278HF 200mA 8K ( SG CT ) 70W 10Hz-70KHz-1dB B 7
JS-6293HF 250mA 3.4K ( SG CT ) 100W 10Hz-100KHz-1dB A 7.5
JS-6295HF 250mA 5K ( SG CT ) 100W 10Hz-80KHz-1dB A 8
JS-6299HF 250mA 10K 100W 10Hz-70KHz-1dB A 8

Preamp Output  ( Nickel Core)

Model Current  Impedance  Impedance  Frequency  Recommended 
Pri Pri B-P Secondary Response Tubes
JS-3002N  50mA  2.5K CT 600W CT  20Hz-47KHz-1dB 2A3 / 300B
JS-3003N  30mA  5K CT 600W CT  20Hz-30KHz-1dB 2A3 / 45
JS-3004N  20mA  10K CT  600W CT  10Hz-30KHz-1dB 6SN7 / 6J5

Power Inductor / Choke

Model  Inductance  DC (mA)  DCR Dimension

WEIGHT (kg)

JS-4009 10H 150 mA 94 A 0.8
JS-4011 10H 120 mA 156 B 0.7
JS-4012 20H 50 mA 390 C 0.5
JS-4013 5H 250 mA 48 A 0.8
JS-4014 1.5H 500mA 16 A 1
JS-4015 5H 250mA 42 D 1.3
JS-4016 2.5H/10H 250mA 28/56 G 2.7
JS-4018 1.5H/6H 450mA 14/28 G 2.7
JS-4022 10H 400mA 40 F 3.5

Interstage / Driver Transformer  ( Nickel Core)

Model Impedance Current Frequency Dimension
Turn Ratio Pri Response
JS-2003N  P.P5K S20K 1+1:2+2 40mA  10Hz-50KHz-1dB D48 X H65
JS-2005N  B.P5K S5K 1+1:1+1 100mA 10Hz-50KHz-1dB 80 X 90 X 100
JS-2006N  B.P7K 1:2CT 20mA  23Hz-18KHz-2dB D72 X H85
JS-2007N B.P10K 1:1CT 20mA 16Hz-23KHz-2dB D72 X H85
JS-2008N B.P5K 1:1CT 40mA 14Hz-26KHz-2dB D72 X H85
JS-2009N B.P5K 1:2CT 40mA 23Hz-18KHz-2dB D72 X H85
JS-2010N B.P10K 1:1.5CT 10mA 24Hz-16KHz-2dB D72 X H85
JS-2012N B.P2.5K 1:0.8CT 60mA 14Hz-44KHz-2dB 80 X 90 X H110
JS-2014N B.P5K 1:1CT 50mA 10Hz-28KHz-2dB 80 X 90 X H110

TANGO

TYPE

DESCRIPTION

Images

U-808
  • Primary 5K (130mA)  Secondary 8, 16 Ohm
    21H (DC100mA)
    Freq. Response 50-50KHZ 2.0dB
  • A Primary 3.5K (130mA) Secondary 8, 16 Ohm
    21H(DC100mA)
    Freq. Range 35-60KHZ 2.0dB
  • B Primary 2.5K (130mA) Secondary 4, 8 Ohm
    21H(DC100mA)
    Freq. Range  25-`65KHZ 2.0dB
  • C Primary
    2K (130mA)  Secondary 4, 8 Ohm
    21H(DC100mA)
    Freq. Response 20-`65KHZ 2.0dB
  • Dimension 94X83X85

 

 

FC-30-3.5S
  • Primary 3.5K (170mA)
    Secondary 4, 6, 8, 16 Ohm
    Freq. Range 20-100KHZ 2.0dB
    26H(DC80mA)
  • Dimension 110X100X114
XE-20S
  • Primary 5K (160mA)  Secondary 8, 16 Ohm
    18H(DC80mA)
    Freq. Range 35-70KHZ 2.0dB
  • A Primary
    3.5K (160mA) Secondary 8,
    18H(DC80mA)
    Freq. Range 25-`90KHZ 2.0dB
  • B Primary
    2.5K (160mA) Secondary 8, 16
    18H(DC80mA)
    Freq. Range 20-90KHZ 2.0dB
  • Dimension 83X78X104

Hammond "CLASSIC" PUSH-PULL ULTRA-LINEAR TUBE OUTPUT

Picture

Cat. No.

Audio Watts (RMS)

Primary Impedance

Max. DC Per Side

Secondary Impedance

Wt. Lbs.

1650 Picture

1650H
40
6,600 ct
200 ma.
4-8-16
6.5
1650K
50
3,400 ct
318 ma.
4-8-16
7
1650N
60
4,300 ct
318 ma.
4-8-16
8

Suggested Tube Types:

Cat. No.

Audio Watts (RMS)

Primary
Impedance

Operation

Tube Types

1650H
40
6,600 ct
Push-Pull (2 Tubes)
6L6GC, 807, 5881, EL34
1650K
50
3,400 ct
Push-Pull Par. (4 Tubes)
6L6GC, 807, 5881, EL34, 6146B, 6550B

1650N

60
4,300 ct

Push-Pull Par. (2 or 4 Tubes)

6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88

 

Hammond "CLASSIC" SINGLE ENDED ULTRA-LINEAR TUBE OUTPUT

Picture

Cat. No.

Audio Watts

Primary

Secondary Impedance

Wt. Lbs.

Impedance

Max. DC Bias

1627SE 25 2,500 132 ma 4-8-16 11
1628SE 25
5,000
132 ma.
4-8-16 11

Suggested Tube Types:

Cat. No.

Triodes

Pentodes

1627SE

2A3, 6A3, 6B4G, 300B

6CA7, 6L6, 807, 5881, 6550, Parallel - 6AQ5, 6V6, EL84

1628SE

SV572-3, SV572-10, SV811-3, 211, 300B

6AQ5, 6V6, 6L6, 807, 5881, 6550, EL84

 

Hammond "CLASSIC" UNIVERSAL SINGLE ENDED TUBE OUTPUT

Picture

Cat. No.

Audio Watts

Max. D.C. Bias
(ma)

Wt. Lbs.

125ESE 15 80 3
125FSE 20 90 4.5
125GSE 25 100 6

 

Hammond "300" Series Plate & Filament Power

Picture

Part Number

Total Power
(VA)

Secondary

Bias Tap (VAC)

Filament #1

Filament #2

Filament #3

Voltage

D.C. Current
(ma.)

(VAC)

(VAC)

(VAC)

 300BX

280

400-0-400

250

50

5V CT @ 1.2A

5V CT @ 3A

6.3V CT @ 6A

 302AX

198

300-0-300

200

50

2.5V CT @ 2.5A

5V CT @ 3A

6.3V CT @ 6A

Wiring table download

Audio Note™ Standard Audio Quality Output Transformers..

Group A - Single-ended Outputs.

Order Code Recommended Valves Max Cl. A Power Primary/Secondary Impedances Size Max. Current
TRANS-144 300B / 2A3 / 6B4G 15 w 2K5 - 4/8 Ohms 80x67x68mm  90mA SE

Group B - Single-ended Outputs.

Order Code Recommended Valves Max Cl. A Power Primary/Secondary Impedances Size Max. Current
TRANS-150 EL84 / ECL86 / 6V6 20 w 2K6  -  4/8 Ohms 117x98x90 mm 110 mA  PSE
TRANS-152 300B / 2A3 / 6B4G 25 w 2K5  -  4/8 Ohms 117x98x90 mm 90 mA  SE
TRANS-180 211/VT4C 75 w 5K    -   4/8 Ohms 137x115x145 mm 240 mA  PSE
TRANS-189 300B / 2A3 / 6B4G 25 w 2K5 - 4/8/16Ohms 117x98x90 mm 90 mA SE

Group B.  Push-Pull Output

Order Code Recommended Valves Max Cl. A Power Primary/Secondary Impedances Size Max. Current
TRANS-200 EL84 / ECL86 / 6V6 15 w 8K  -   4/8 Ohms 80x67x68 mm PP
TRANS-185 EL34 / 6L6G / 5881 25 w 6K   -    4/8 Ohms 88x73x80 mm PP
TRANS-175 2A3 / 6B4G / 300B 30 w 5K  -   4/8 Ohms 88x75x80 mm PP

 

Audio Note™ Chokes and Inductors.

Order Code Value Size
CHOKE-160 10H/125mA       63x74x76 mm
CHOKE-165 10H/200mA       98x65x83 mm
CHOKE-180 20H/50mA       68x56x58 mm

 

 

Tube amplifier transformers
OPTs, mains and interstage transformers

General Properties:

  • High quality silicon iron C-cores
     
  • very robust open frame structure
     
  • Precision winding with insulation between each layer of copper wire for minimum intra-winding capacitance.

Anode chokes, interstage and line output transformers

Tube amplifier transformers
OPTs, mains and interstage transformers

General Properties:

  • High quality silicon iron C-cores
     
  • very robust open frame structure
     
  • Precision winding with insulation between each layer of copper wire for minimum intra-winding capacitance.

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
LL1689 Line output transformer
Based on the LL1660 size and structure
9+9 : 1+1+1+1 Application dependent Application dependent Application dependent

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

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 single 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.

Push-Pull. Voltage (RMS) and power @ 30 Hz

Type Max Prim. Voltage 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 (w. UL) 670V 150H C 4.5k 0.4 105W

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
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
LL1679 (w. UL) 295V 70mA - C 4.5k 0.4 20W
LL1620 525V 50mA 100H C 11.0k 0.5 25W
 

More output transformers!!

The LL1663, LL1664 and LL1682 are small size 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
     
  • The LL1664 is a 3k:8 ohms output transformer also available in PP or SE versions
     
  • The LL1682 is a 5.5k:5 ohms output transformer also available in PP or SE versions

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 / 0.16mA 6.6V / 3A 5.2V / 3A 48V / 0.1A

Chokes for tube amp power supply

Type Inductance Rec. DC current Saturating current DC resistance
LL1638 / 4H 4 H 400mA 575 mA 36 ohms
LL1638 / 8H 8 H 200mA 290 mA 36 ohms
LL1638 / 10H 10 H 150 mA 215 mA 36 ohms
LL1673 / 10H 10 H 200 mA 290 mA 60 ohms
LL1673 / 15H 15 H 140 mA 200 mA 60 ohms
LL1673 / 20H 20 H 100 mA 145 mA 60 ohms
LL1685 / 100mA 17 H 100 mA 145 mA 130 ohms
LL1685 / 160mA 10 H 160 mA 230 mA 130 ohms

Note: Data and Product Listing is under permission from Mr. Per Lundahl, Lundahl Transformers AB, SWEDEN
 

Others Transformer

ITEMS DESCRIPTION PICTURE
Toroid

OEM part:

Pri:0-220V-240V

2.5V-4V-5V-9V-CT

2A, 18W

 

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