SILK Custom Power Transformer
 
Open frame U-Bracket
Square open frame
(with External shield option)
Open frame Industrial Connector (7)
(with External shield option)
Black End Belt cover with fly lead out
Enclose casing
 

- We custom made transformers with +20 years of experience
- All transformers are 100% made in house and fully test before completion
- Any other specific primary line voltage could be arranged to generate secondary voltage you want.
- Custom Winding Available. eg. super low flux leakage transformer for sensitive phono stage circuit.

- If you do not see what you want, please send email to us at info@sacthailand.com

  
 
  Silk Custom Power Transformer cost estimation (please contact to confirm actual price) UPDATE: MAY 2025
 
  VA is the total value of output voltage x current of all secondary coils. For example; 300-0-300V @ 150mA equivalent to 90VA. 0-6.3-10V @ 4A equivalent to 40VA
 
VA
Base Cost
(THB)
Standard Secondary Terminal
Additional
Terminal
(THB)
Max Secondary Terminal
Standard (1) (2) (3)
Single Coil Spec
Shield
Finishing Option
Black End Belt cover
Fly lead STD (6
+(THB) )
Enclose casing (5)
Voltage (Volt)
Current (Amp)
Electrostatic +(THB)
External
+ (THB)
Fly lead STD (6)
+(THB)
Soldering Tag
+(THB)
<=25
700
3
N/A
3
100
1
x
x
x
x
x
26-50
1,400
5
150
8
200
1
x
x
100
600
x
51-75
1,950
6
200
8
200
1
x
x
100
600
x
76-100
2,400
8
200
10
400
2
x
x
150
700
1,000
101-125
3,000
8
200
12
600
2
350
200
150
800
1,000
126-150
3,600
8
200
12
600
3
350
300
150
800
1,200
151-175
4,200
8
200
14
800
3
500
400
200
1,000
1,200

176-200
4,800
10
200
14
800
3
500
400
200
1,000
1,500
201-225
5,400
10
200
16
800
3
800
500
200
1,200
1,500
226-250
6,250
10
200
16
800
3
800
500
200
1,200
1,500
251-275
6,600
10
200
16
800
4
1,000
500
300
1,200
1,500
276-300
7,200
10
200
18
1,000
4
1,000
600
300
1,200
1,500
301-325
7,475
12
200
18
1,000
5
1,000
600
300
1,200
1,500
326-350
7,700
12
200
18
1,000
5
1,000
700
300
1,200
1,500
351-375
8,250
12
200
20
1,000
5
1,200
800
300
1,200
1,500
376-400
8,800
12
200
20
1,000
5
1,200
800
300
1,500
1,500
401-425
8,925
12
200
20
1,200
5
1,200
800
300
1,500
2,000
426-450
9,450
12
200
20
1,200
5
1,200
800
300
1,500
2,000
451-475
9,500
12
200
20
1,200
5
1,500
800
300
1,500
2,000
476-500
10,000
12
200
20
1,200
5
1,500
800
300
1,500
2,000
>500
Please Contact
 
  (1). Over standard per coil Cost/Voltage = add 20 THB
(2). Over standard per coil Cost/1,000 mA Current = add 200 THB
(3). More than one High Voltage coils (30% voltage of standard single voltage coil) add 10% to the total cost for each of such coil
(4). Base cost is for U-brancket or Square Open Frame finishing, STD fly lead outs
(5). Enclose Casing can be fitted with additional mumetal shielding for 1,000 THB
(6). Silver Plated/Teflon fly lead option is available at additional cost
(7). Industrial connector option is available at additional cost		  
 
  SILK Power Transformer Example/Popular Models
 
Model
S1
S2
S3
S4
S5
S6
Recommend Circuit
Price
Type#1/#2
Price
Type#3
Voltage
Current
Voltage
Current
Voltage
Current
Voltage
Current
Voltage
Current
Voltage
Current
PWRT-1
400-0-400V
250mA
5V
3A
6.3V
3A
5V
3A
5V
3A
X
X
300B SE stereo
8,800
9,800
PWRT-2
300-0-300V
250mA
5V
3A
6.3V
3A
2.5V
3A
2.5V
3A
X
X
45, 2A3 SE stereo
6,900
7,900
PWRT-3
400-300-0-300-400V
250mA
5V
3A
6.3V
3A
2.5-0-2.5V
3A
2.5-0-2.5V
3A
X
X
300B or 2A3 SE stereo
9,600
10,600
PWRT-4
0-300-440V
450mA
70V
50mA
12.6V
2A
12.6V
2A
12.6V
2A
X
X
EL-34, 6550, KT-88 PP stereo
9,400
10,400
PWRT-5
220-180-0-180-220V
150mA
5V
3A
0-6.3-10V
3A
X
X
X
X
X
X
6SN7, 5687, 12AX7, 12AU7 pre-amp
4,800
5,800
PWRT-6
0-740V
220mA
150-0-150V
60mA
10V
5A
6.3V
2A
6.3V
2A
5V
3A
211/845 mono
8,800
9,800
PWRT-7
0-840V
250mA
300-0-300V
80mA
20V
4A
6.3V
2A
5V
3A
100V
50mA
GM-70 mono
10,550
11,550
PWRT-8
0-140V
1000mA
320V
100mA
12.6V
4A
12.6V
4A
6.3V
3A
X
X
6C33C-B stereo
9,300
10,300
PWRT-9
280-0-280V
200mA
5V
3A
6.3V
4A
6.3V
2A
X
X
X
X
6BQ5, EL-84, 6V6, 6F6 SE stereo
5,800
6,800
PWRT-10
320-0-320V
250mA
5V
3A
6.3V
4A
6.3V
2A
X
X
X
X
EL-34, 6550, KT-88 SE stereo
7,600
8,600

***Primary Type#1: 110-120 V @ 50-60 Hz
***Primary Type#2: 220-240V @ 50-60Hz
***Primary Type#3: 110V or 220V@50-60Hz can be selected by re-wiring the primary coils by user

Power Transformer with ENCLOSED CASING (Black color)
Size#A: 6.5 cm x 7 cm x 9.5 cm
Size#B: 9.5  cm x 11 cm x 9.5 cm
Size#C: 11 cm x 13 cm x 11.5 cm
Size#D: 13 cm x 15 cm x 16 cm