Choose a Lundahl transfomer by impedance
Dual-Impedance Switch Board.
We have three Board-Switch combinations:
This table is for using the Dual-Impedance Switch Board like above
SE and PP are both posible |
Primary Impedance |
Set the switch to 'Low' Position |
Set the switch to 'High' Position |
Board + Switch Combination |
650Ω |
4Ω |
8Ω |
||
1k2Ω |
4Ω |
8Ω |
||
1k2Ω |
8Ω |
16Ω |
||
1k6Ω |
4Ω |
8Ω |
||
1k6Ω |
4Ω |
8Ω |
||
3kΩ |
4Ω |
8Ω |
||
3kΩ |
8Ω |
16Ω |
||
3k3Ω |
4Ω |
8Ω |
||
4k5Ω |
4Ω |
8Ω |
EE32-EE17 |
|
5k6Ω |
8Ω |
16Ω |
||
6kΩ |
4Ω |
8Ω |
||
6kΩ |
8Ω |
16Ω |
||
6k5Ω |
4Ω |
8Ω |
||
9k7Ω |
8Ω |
16Ω |
EE32-EE17 |
|
11kΩ |
4Ω |
8Ω |
||
11kΩ |
8Ω |
16Ω |
||
11k5Ω |
8Ω |
16Ω |
||
23kΩ |
8Ω |
16Ω |
These tables show also Inductance and Output Power, as you will find this also in the official datasheets.
Single Ended transformers |
||||||
| These are multi impedance transformers. You will find the same type at more positions in this table. These impedances can allways be done with the same transformer. | ||||||
Primary |
Henry |
Watt |
Type |
4Ω |
8Ω |
16Ω |
600Ω
|
140
|
Alt.C
|
Alt.D
|
Alt.E
|
||
650Ω |
50
|
Alt.C
|
Alt.D
|
Alt.E
|
||
1000Ω
|
70
|
Alt.B
|
Alt.C
|
Alt.D
|
||
1200Ω
|
25
|
Alt.B
|
Alt.C
|
Alt.D
|
||
1600Ω
|
50
|
Alt.C
|
Alt.D
|
Alt.E
|
||
2300Ω
|
13
|
-
|
Alt.B
|
Alt.C
|
||
2300Ω
|
35 |
-
|
Alt.B
|
Alt.C
|
||
2600Ω
|
36
|
Alt.C
|
Alt.D
|
Alt.E
|
||
3000Ω
|
25
|
Alt.B
|
Alt.C
|
Alt.D
|
||
3300Ω
|
50
|
Alt.C
|
Alt.D
|
Alt.E
|
||
4500Ω
|
20
|
Alt.B
|
Alt.C
|
Alt.D
|
||
5600Ω
|
13
|
-
|
Alt.B
|
Alt.C
|
||
6000Ω
|
25
|
Alt.B
|
Alt.C
|
Alt.D
|
||
6500Ω
|
50
|
Alt.C
|
Alt.D
|
Alt.E
|
||
9000Ω
|
30
|
only 8Ω
|
||||
9200Ω
|
30
|
Alt.B
|
Alt.C
|
Alt.D
|
||
9700Ω
|
9
|
-
|
Alt.B
|
Alt.C
|
||
11000Ω
|
13
|
-
|
Alt.B
|
Alt.C
|
||
11500Ω |
13
|
-
|
Alt.B
|
Alt.C
|
||
23000Ω
|
13
|
-
|
Alt.B
|
Alt.C
|
||
Push Pull transformers |
||||||
Primary |
Henry |
Watt |
Type |
4Ω |
8Ω |
16Ω |
600Ω
|
150
|
700
|
Alt.C
|
Alt.D
|
Alt.E
|
|
650Ω |
60
|
250
|
Alt.C
|
Alt.D
|
Alt.E
|
|
1000Ω
|
150
|
360
|
Alt.B
|
Alt.C
|
Alt.D
|
|
1200Ω
|
60
|
125
|
Alt.B
|
Alt.C
|
Alt.D
|
|
1600Ω
|
150
|
250
|
Alt.C
|
Alt.D
|
Alt.E
|
|
2300Ω
|
60
|
62 |
-
|
Alt.B
|
Alt.C
|
|
2300Ω
|
150
|
180
|
-
|
Alt.B
|
Alt.C
|
|
2600Ω
|
150
|
188
|
Alt.C
|
Alt.D
|
Alt.E
|
|
3000Ω
|
150
|
125
|
Alt.B
|
Alt.C
|
Alt.D
|
|
3300Ω
|
300
|
250
|
Alt.C
|
Alt.D
|
Alt.E
|
|
4500Ω
|
150
|
105
|
Alt.B
|
Alt.C
|
Alt.D
|
|
5600Ω
|
150
|
62
|
-
|
Alt.B
|
Alt.C
|
|
6000Ω
|
300
|
125
|
Alt.B
|
Alt.C
|
Alt.D
|
|
6500Ω
|
570
|
250
|
Alt.C
|
Alt.D
|
Alt.E
|
|
9700Ω
|
150
|
45
|
-
|
Alt.B
|
Alt.C
|
|
11000Ω
|
570
|
125
|
Alt.B
|
Alt.C
|
Alt.D
|
|
11500Ω |
300
|
62
|
-
|
Alt.B
|
Alt.C
|
|
23000Ω
|
570
|
62
|
-
|
Alt.B
|
Alt.C
|
|
PP versions(max 15% offset) |
The standard PP Versions can take 15% DC Current offset, and keep all datasheet specifications while doing so. At lower offset, the transformer will behave even better than datasheet specifications. Useually meaning the low (3dB) point will be better as expected. This also applies when you use a transformer below it's maximum power level. So the datasheet is always a worst case specification. This explains why you may meausure the transformer will go down to (for instance) 3Hz, while the datasheet specifies 20Hz. |
|||||
PPZ Versions |
PPZ stands for PP-Zero-DC. Parafeed transformers are a non-catalog product, and JACMUSIC supplies those on customer order, at no extra costs. The Parafeed have roughly twice the inductance as compared to standard products, but for that can take zero DC current. These will give much improved bass performance, as the low (3dB) point will go down to half the frequency of normal PP versions. There is no datasheet for those, but obviously this text here is all there is to say about it. On the transformer is printed PPZ instead of PP. | |||||
Order Number |
Type Number |
Impedance / Output Power |
Inductance |
These are the single impedance transformers. So you cannot change the primary or secondary impedance, as you can do with the multi impedance transformers. |
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218-131-76 |
5k to 8Ω, 8Watt. |
35H |
|
218-132-76 |
5k to 8Ω, 8Watt. |
22H |
|
218-132-92 |
5k to 8Ω, 8Watt. |
17H |
|
218-133-34 |
3k to 8Ω, 10Watt. |
35H |
|
218-134-09 |
3k to 8Ω, 10Watt. |
29H |
|
218-135-90 |
3k to 8Ω, 10Watt. |
22H |
|
218-136-68 |
3k to 8Ω, 10Watt. |
17H |
|
218-137-48 |
5k to 5Ω, 8Watt. |
35H |
|
218-138-90 |
5k to 5Ω, 8Watt. |
17H |
|
218-185-87 |
9k to 8Ω, 30Watt. For 845, GM70 |
35H |
|