Lundahl output transformers.
Recommendations by tube type
Tube |
Ra @ Plate to Cathode Voltage |
Transformer |
Order Nr |
Primary |
Secondary Output Power |
Low Freq.
|
Notes |
1605 SE |
110mA@580V Ra=861Ω |
218-111-49 |
3kΩ |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω 22Watt |
16Hz @1.5dB |
||
2x 1605 PSE |
220mA@580V
Ra=430Ω |
218-269-58 |
1k6Ω 13H |
Alt.C = 4Ω Alt.D = 8Ω Alt.E = 16Ω 44Watt |
15Hz @1.5dB |
||
4x 1605 |
440mA@580V Ra=215Ω |
218-179-91 |
600Ω 8H (in parallel) |
Alt.C = 4Ω Alt.D = 8Ω Alt.E = 16Ω 91Watt |
15Hz @1.5dB |
||
2A3 SE |
60mA @250V Ra=800Ω |
218-109-00 |
3kΩ 46H |
Alt.B = 4Ω |
8Hz @1.5dB |
||
2A3 SE |
60mA @250V |
218-134-09 |
3kΩ 29H |
8Ω 3.5Watt |
12Hz @1.5dB |
||
2x 2A3 PSE |
each tube |
218-107-95 |
1k2Ω 12H |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω 7Watt |
16Hz @1.5dB |
||
2A3-S |
75mA @375V Ra=745Ω |
218-110-72 |
3kΩ 30H |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω 9Watt |
5Hz @1.5dB |
||
2x 2A3-S PSE |
each tube 75mA @375V Ra=373Ω |
218-108-27 |
1k2Ω 9H |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω 20Watt |
10Hz @1.5dB |
||
20B SE |
42mA @420V Ra=3k4Ω |
218-143-29 |
16k |
8Ω 8Watt |
19Hz @1.5dB |
||
300B-mesh SE |
60mA@365V |
218-134-09 |
3kΩ 29H |
8Ω |
7Hz @1.5dB |
||
300B-mesh SE |
60mA@365V Ra=700Ω |
218-109-00 |
3kΩ 46H |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω 7Watt |
3Hz @1.5dB |
||
300B |
80mA@400V Ra=790Ω |
218-110-72 |
3kΩ 30H |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω |
5Hz @1.5dB |
||
300B-XLS SE |
80mA@450V Ra=700Ω |
218-135-90 |
3kΩ 22H |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω 15Watt |
5Hz @1.5dB |
||
300B-XLS |
80mA@450V Ra=700Ω |
218-110-72 |
3kΩ 30H |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω 15Watt |
5Hz @1.5dB |
||
300B-XLS SE |
110mA@457V Ra=670Ω |
218-251-91 |
3k 23H |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω 20Watt |
7Hz @1.5dB |
||
45 or 45 Mesh |
34mA @250V Ra=1750Ω |
218-114-48 |
6kΩ 60H |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω 1.5Watt |
13Hz @1.5dB |
||
45 or 45 Mesh SE |
36mA @275V Ra=1670Ω |
218-114-48 |
6kΩ 60H |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω 1,8Watt |
12Hz @1.5dB |
||
45 Mesh only |
39mA @300V Ra=1600Ω |
218-114-48 |
6kΩ 60H |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω 2,5Watt |
12Hz @1.5dB |
||
45 or 45 Mesh SE |
36mA @275V Ra=1670Ω |
218-258-83 |
5kΩ 45H |
8Ω 2Watt |
17Hz @1.5dB |
||
45 or 45 Mesh SE |
34mA @250V Ra=1750Ω |
218-258-83 |
5kΩ 45H |
8Ω 1.6Watt |
17H @1.5dBz |
||
45 Mesh only |
39mA @300V Ra=1600Ω |
218-258-83 |
5kΩ |
8Ω 2.9Watt |
17Hz @1.5dB |
||
2x45 Mesh only PSE |
2x39mA @300V Ra=800Ω |
218-131-76 |
3kΩ 29H |
8Ω 5.2Watt |
10Hz @1.5dB |
||
50 SE |
55mA @450V Ra=1800Ω |
Custom made. Price is same as normal LL1679 |
4k3Ω 51H |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω 4.3Watt |
16Hz @1.5dB |
||
520B SE |
120mA@500V Ra=500Ω |
218-111-49 |
3kΩ 24H |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω 17Watt |
8Hz @1.5dB |
||
520B SE |
120mA@500V Ra=500Ω |
218-268-19 |
2k2Ω 23H |
Alt.C = 4Ω Alt.D = 8Ω Alt.E = 16Ω 20Watt |
8Hz @1.5dB |
||
2x 520B PSE |
240mA@500V Ra=250Ω |
218-268-19 |
1kΩ 16H |
Alt.B = 4Ω Alt.C = 8Ω Alt.D = 16Ω 41Watt |
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 600Ω. Secundary: ALT-C= 4Ω. ALT-D=8Ω. Alt-E=16Ω.