How to choose a Lundahl output transformer, by tube type

THE TUBE<===
===>THE TRANSFORMER
Tube

Class

Ua

Ia
Bias
Screen
Tube
Trans- former

Primary
Type

Order Nr.
L
Secondary

Output power Limit of this trans-former

Low Freq.
Response

SE Triode

580V to ground

110mA

no

Tube Rp
861Ω

Primary
3000Ω
218-111-49
24H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
22Watt

16Hz @1.5dB

SE Triode

668V to ground

110mA

Auto
Rk= 800 Ω

Auto-Bias

no

Tube Rp
861Ω

Primary
3000Ω
218-111-49
24H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
22Watt

16Hz @1.5dB

PSE Triode
580V to ground
220mA
no
Tube Rp
430Ω
Primary
1600Ω

LL1623-220mA

218-269-58

13H
Alt.C = 4Ω
Alt.D = 8Ω
Alt.E = 16Ω
44Watt
14Hz @1.5dB
PSE Triode
668V to ground
220mA

Auto
Rk= 800 Ω
each tube

Auto-Bias

no
Tube Rp
430Ω
Primary
1600Ω

LL1623-220mA

218-269-58

13H
Alt.C = 4Ω
Alt.D = 8Ω
Alt.E = 16Ω
44Watt
14Hz @1.5dB
PP Triode
no

Tube Rp
861Ω

Primary
4500Ω

218-095-69
150H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
   

2A3

2A3-mesh

AD1

SE Triode
295V to ground
60mA

Auto
Rk= 750Ω

Auto-Bias

no
Tube Rp
800Ω
Primary
3000Ω
218-109-00
46H

Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω

3.5 Watt
8Hz @1.5dB

2A3

2A3-mesh

AD1

SE Triode
295V to ground
60mA

Auto
Rk= 750Ω

Auto-Bias

no
Tube Rp
800Ω
Primary
3200Ω
218-134-09
29H
3.5 Watt
12Hz @1.5dB

2x 2A3

2x 2A3-mesh

2x AD1

PSE Triode

295V to ground

60mA
Each tube

Auto
Rk= 750Ω
Each tube

no
Tube Rp
400Ω
Primary
1200Ω
218-107-95
12H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
7 Watt
16Hz @1.5dB
SE Triode
447V
75mA

Auto
Rk= 960Ω

Auto-Bias

no
Tube Rp
745Ω
Primary
3000Ω
218-110-72
30H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
9 Watt
5Hz @1.5dB
SE Triode
375V
75mA
no
Tube Rp
745Ω
Primary
3000Ω
218-110-72
30H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
9 Watt
5Hz @1.5dB
SE Triode
447V
75mA

Auto
Rk= 960Ω

Auto-Bias

no
Tube Rp
745Ω
Primary
3000Ω
218-110-72
30H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
9 Watt
5Hz @1.5dB
PSE Triode
375V

75mA
Each tube

Auto
Rk= 960Ω

no
Tube Rp
373Ω

Primary
1k2Ω

218-108-27
9H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
20 Watt
10Hz @1.5dB
SE Triode
420V
42mA
no
Tube Rp
30004
Primary
16000Ω
218-143-29
17H
8Watt

19Hz @1.5dB

SE Triode

365V

60mA
no
Tube Rp
700Ω
Primary
3000Ω
218-134-09
29H
10Hz @1.5dB
SE Triode
365V
60mA
no
Tube Rp
700Ω
Primary
3000Ω
218-109-00
46H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
7 Watt
6Hz @1.5dB
SE Triode

435V to ground

80mA

Auto
Rk= 750Ω

Auto-Bias

Schematic

no
Tube Rp
790Ω
Primary
3000Ω
218-135-90
22H
10 Watt
13Hz @1.5dB
SE Triode
435V to ground
80mA

Auto
Rk= 750Ω

Auto-Bias

no
Tube Rp
790Ω
Primary
3000Ω
218-110-72
30H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
10 Watt
11Hz @1.5dB
SE Triode
450V
80mA
no
Tube Rp
700Ω
Primary
3000Ω
218-135-90
22H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
10 Watt
13Hz @1.5dB
SE Triode
450V
80mA
no
Tube Rp
700Ω
Primary
3000Ω
218-110-72
30H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
15 Watt
10Hz @1.5dB
SE Triode
450V
90mA
no
Tube Rp
700Ω
Primary
3000Ω
218-110-72
30H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
17 Watt
10Hz @1.5dB
SE Triode
457V
110mA
no
Tube Rp
670Ω
Primary
3000Ω
218-251-91
23H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
20 Watt
12Hz @1.5dB
SE Triode
500V
100mA
no
Tube Rp
670Ω
Primary
3000Ω
218-251-91
23H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
25 Watt
12Hz @1.5dB

45

45 Mesh

SE Triode
250V
34mA
no

Tube Rp
1750Ω

Primary
6000Ω
218-114-48
60H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω

1.5 Watt

13Hz @1.5dB

45

45 Mesh

SE Triode
275V
36mA
no

Tube Rp
1670Ω

Primary
6000Ω
218-114-48
60H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω

1,8 Watt

12Hz @1.5dB

SE Triode
300V
39mA
no

Tube Rp
1600Ω

Primary
6000Ω
218-114-48
60H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω

2,5 Watt

12Hz @1.5dB

45

45 Mesh

SE Triode
275V
36mA
no

Tube Rp
1670Ω

Primary
5000Ω

LL1663-039mA

218-258-83
45H

2 Watt

16Hz @1.5dB

45

45 Mesh

SE Triode
250V
34mA
no

Tube Rp
1750Ω

Primary
5000Ω

LL1663-039mA

218-258-83
45H

1.6 Watt

17H @1.5dBz
SE Triode
300V
39mA
no

Tube Rp
1600Ω

Primary
5000Ω

LL1663-039mA

218-258-83
45H

2.9 Watt

15Hz @1.5dB
PSE Triode
300V
2x39mA
no

Tube Rp
800Ω

Primary
3000Ω
218-131-76
29H

5.2 Watt

12Hz @1.5dB
SE Triode
450V
55mA
no

Tube Rp
1800Ω

Primary
4500Ω
218-286-52
51H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω

4.3 Watt

16Hz @1.5dB

SE Triode

500V
120mA
no
Tube Rp
500Ω
Primary
3000Ω
218-111-49
24H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
17 Watt
8Hz @1.5dB

SE Triode

500V
120mA
no
Tube Rp
500Ω
Primary
2200Ω
218-268-19
23H
Alt.C = 4Ω
Alt.D = 8Ω
Alt.E = 16Ω
20 Watt

9Hz @1.5dB

PSE Triode

500V
230mA
no
Tube Rp
250Ω

Primary
1000Ω

218-179-91
16H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
41 Watt
7Hz @1.5dB
845
SE
850...1250V
70mA
no
Tube Rp
1700Ω
Primary
9200Ω

LL1688-70mA

App Note

Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
30 Watt
845
SE
850...1250V
70mA
no
Tube Rp
1700Ω
Primary
9000Ω

LL1691-70mA

App Note

8Ohms
30 Watt
845
SE
900...1100V
80mA
no
Tube Rp
1700Ω
Primary
5k6Ω
Alt.C = 4Ω
Alt.D = 8Ω
Alt.E = 16Ω
30 Watt
EL34
SE Pentode
100mA
120Ω
265V 9mA

Tube Rp
Very High

Primary
2200Ω
218-268-19
23H
Alt.C = 4Ω
Alt.D = 8Ω
Alt.E = 16Ω
11Watt
EL34
PP Ultra
Linear
440V
120mA

per tube
375V
4..8mA

Tube Rp
Medium

( because Ultra Linear)

Primary
3400Ω
218-096-43
Alt.C = 4Ω
Alt.D = 8Ω
Alt.E = 16Ω
55Watt
6Hz @1.5dB
EL84
SE Pentode
48mA
135Ω
250V 5.5mA
Tube Rp Very High
Primary
5000Ω

LL1663-050mA

218-258-83
45H

6 Watt

 

EL156
SE Pentode
120mA
135Ω
250V 15mA
Tube Rp
Very High
Primary
4500Ω
218-268-19
23H
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω

15 Watt

 

KT88

PP Ultra
Linear
if someone has more data, please let me know.
Tube Rp
Very High
Primary
4500Ω

LL1679-PP

App Note

218-095-69
Alt.B = 4Ω
Alt.C = 8Ω
Alt.D = 16Ω
100Watt

 

 

Some Guitar Amplifier applications

Tube

PP /SE

Transformer

Order Nr
Secondary

Output
power

Remarks

PP

218-104-74
15 Watt
Relatively clean sound
PP
218-105-69
35 Watt
Moderate distortion possible
PP

LL1664PP

218-103-77
50 Watt
Very crunchy distortion possible
PP

LL1664PP

218-103-77
30 Watt

Moderate distortion possible

PP

LL1664PP

218-103-77
50 Watt

Heavy distortion possible

 



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