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Lundahl output transformer, recommendations by tube type

Last revision:
27-Jun-2017 17:32


Line
Tube

PP /SE

Plate voltage
refers to Cathode voltage

Tube Anode
Impedance

Transformer

Order Nr
Henry
Ra
Secondary

Output power

Low Freq.
Response

Notes
1
1605

SE

110mA@580V
861Ω
218-111-49
24H
3k
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
22 Watt
16Hz @1.5dB
 
2
2x 1605
2x PSE
220mA@580V
430Ω

218-269-58

13H
1k6
Alt.C = 4Ω
Alt.D = 8Ω
Alt.E = 16Ω
44 Watt
15Hz @1.5dB
 
3
4x 1605
4x PSE
440mA@580V
215Ω

218-179-91

8H
(in parallel)
600
Alt.C = 4Ω
Alt.D = 8Ω
Alt.E = 16Ω
91 Watt
15Hz @1.5dB
4

2A3
2A3-mesh
AD1

SE
60mA @250V
800Ω
218-109-00
46H
3k

Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω

3.5 Watt
8Hz @1.5dB
 
5
2A3
2A3-mesh
AD1
SE

60mA @250V

800Ω
218-134-09
29H
3k
3.5 Watt
12Hz @1.5dB
 
6

2x 2A3
2x 2A3-mesh
2x AD1

PSE

each tube
60mA @250V

400Ω
218-107-95
12H
1k2
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
7 Watt
16Hz @1.5dB
7
2A3-S
SE
75mA @ 375V
745 Ω
218-110-72
30H
3k
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
9 Watt
5Hz @1.5dB
 
8
2x 2A3-S
PSE
each tube
75mA @ 375V
373 Ω
218-108-27
9H

1k2

Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
20 Watt
10Hz @1.5dB
 
9
20B
SE
42mA @420V
3k4
218-143-29
17H
16k
8Watt

19Hz @1.5dB

 
10
300B-mesh
SE

60mA@365V

700Ω
218-134-09
29H
3k
7Hz @1.5dB
 

11

300B-mesh
SE
60mA@365V
700Ω
218-109-00
46H
3k
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
7 Watt
3Hz @1.5dB
 
12
300B
SE
80mA@400V
790Ω
218-110-72
30H
3k
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
5Hz @1.5dB
 
13
300B-XLS
SE
80mA@450V
700 Ω
218-135-90
22H
3k
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
15 Watt
5Hz @1.5dB
 
14
300B-XLS
SE
80mA@450V
700 Ω
218-110-72
30H
3k
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
15 Watt
5Hz @1.5dB
 
15
300B-XLS
SE
110mA@457V
670 Ω
218-251-91
23H
3k
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
20 Watt
7Hz @1.5dB
 
16
45 or 45 Mesh
SE
34mA @250V

1750Ω

218-114-48
60H
6k
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω

1.5 Watt

13Hz @1.5dB

 
17
45 or 45 Mesh
SE
36mA @275V

1670 Ω

218-114-48
60H
6k
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω

1,8 Watt

12Hz @1.5dB

 
18
45 Mesh only
SE
39mA @300V

1600Ω

218-114-48
60H
6k
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω

2,5 Watt

12Hz @1.5dB

19
45 or 45 Mesh
SE
36mA @275V

1670Ω

LL1663-039mA

218-258-83
45H
5k

2 Watt

17Hz @1.5dB

20
45 or 45 Mesh
SE
34mA @250V

1750Ω

LL1663-039mA

218-258-83
45H
5k

1.6 Watt

17H @1.5dBz
21
45 Mesh only
SE
39mA @300V

1600Ω

LL1663-039mA

218-258-83
45H
5k

2.9 Watt

17Hz @1.5dB
22
2x45 Mesh only
PSE
2x39mA @300V

800 Ω

218-131-76
29H
3k

5.2 Watt

10Hz @1.5dB
23
50
SE
55mA @450V

1800Ω

Custom made. Price is same as normal LL1679
51H
4k3
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω

4.3 Watt

16Hz @1.5dB

24
520B

SE

120mA@500V
500Ω
218-111-49
24H
3k
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
17 Watt
8Hz @1.5dB
25
520B

SE

120mA@500V
500Ω
218-268-19
23H
2k2
Alt.C = 4Ω
Alt.D = 8Ω
Alt.E = 16Ω
20 Watt
8Hz @1.5dB
 
26
2x 520B

PSE

240mA@500V
250Ω
218-268-19
16H
1000
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
41 Watt
7Hz @1.5dB
 
..
  • Note 1) Note, EML Mesh Version can do higher power than solid plate version. This is NOT so with China tubes. gst other this will give better bias stability of the tube, some protection against accidental overload, and better linearity of tube curves.
  • Note 2) Application for ultra low distortion.
  • Note 3) These two transformers are simply point to point connected in parallel. Thought it may seem hard to believe, primary and secondary impedance will stay the same this way, because the windings ratio will not chance. The total configuration, so two transformers in parallel, behave like this: Maximum Ouput=140Watt. Inductance= 8H. Maximum DC current=460mA. Primary 600 Ohms. Secundary: ALT-C= 4Ohms. ALT-D=8Ohms. Alt-E=16Ohms.

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