SAC Thailand
SILK Output Transformer
 
   
 
Single Ended Output Transformer with "SILK Wounding" Technique
 
  We are proundly present the best quality Hand-wound Output transformer with SILK Winding technology. The following product lists are just examples of our best seller products. We do accept Custom winding to meet special requirement as well as OEM.
  • Standard EI core construction or special Cut-core / double Cut-core construction option
  • Multi-impedance transformer
  • Electro-static loudspeaker / headphone Headphone amplifier
  • Guitar amplifier
  • Loudspeaker attenuator
  • Autoformer for solid-state amplifier
  • Cathode Feedback or separated feedback coil
  • Balanced output

Our SILK Single-ended Output Transformer can be characterised by having very wide bandwidth and smooth frequency response, low insertion loss, low phase shift, low distortion at high and low frequency, very constant impedance throughout its frequency band, precision air-gapped (adjusted under FFT analysis), and newest development of Genius Muliple Secondary (0-4-8 ohm or 0-8-16 ohm) that has equal sounding quality to both taps. Since we do not usually stock all transformers, actually most are made to order, so our latest development and technique will be used to produce the best transformer and the specification is usually surpass the one published below. 
 		  
 

E Series 500V Rating 1.5X current handling capability
Secondary Impedance: 0-4-8 ohm Rated Output Power:12W
Size: 6.5 cm x 7 cm x 9.5 cm
Model
Primary Coil
Inductance at 20Hz
7Vrms
Frequency Response (-3.0dB)
Source Impedance = Rp
Weight
(kg./ea)

Recommended Circuit
Price (pair)
THB
Ei construction
Impedance (Rp)
UL tap
Norminal DC current (max)
S-101
1.0K
n/a
150mA (220mA)
4.5H
25Hz - 90KHz
1.3
6AS7, 12B4A
6,000
S-105
1.5K
n/a
120mA (180mA)
6.5H
25Hz - 85KHz
1.3
2A3, 6B4G paralleled
6,000
S-205
2.5K
n/a
60mA (90mA)
12.0H
25Hz - 80KHz
1.3
2A3, 6B4G, 300B
6,600
S-303
3.0K
44%
75mA (110mA)
14.5H
30Hz - 80KHz
1.3
PX-25, 6V6, 6F6
6,600
S-305
3.5K
44%
70mA (100mA)
15.5H
30Hz - 75KHz
1.3
6CA7, 6L6, 807, 7591
6,600
S-502
5.0K
n/a
60mA (90mA)
18.0H
35Hz - 75KHz
1.3
45, 71A, VT-52, 6BL7, 6BQ5, 6BX7
7,200
S-505
6.6K
44%
55mA (80mA)
20.0H
35Hz - 70KHz
1.3
EL-84, 6BM8, EL-34, KT-66
7,200

F Series 750V Rating 2X+ current handling capability
Secondary Impedance: 0-4-8 ohm Rated Output Power:20W
Size : 9.5 cm x 11 cm x 9.5 cm
Model
Primary Coil
Inductance at 20Hz
7Vrms
Frequency Response (-3.0dB)
Source Impedance = Rp
Weight
(kg./ea)
Recommended Circuit
Price (pair)
THB
Ei construction
Impedance (Rp)
UL tap
Norminal DC current (max)
S-6-6C33F
600R
n/a
250mA (500mA)
7.0H
20Hz - 90KHz
2.5
6C33C-B
11,500
S-1-6C33F
1.0K
n/a
250mA (500mA)
9.0H
20Hz - 90KHz
2.5
6C33C-B, 6336A
11,500
S-125F
1.25K
n/a
160mA (320mA)
12.0H
20Hz - 90KHz
2.5
300B Paralleled
11,500
S-220F
2.0K
44%
140mA (280mA)
15.0H
20Hz - 90KHz
2.5
EL-34, 6550, KT-88 Paralleled
11,500
S-250F
2.5K
44%
90mA (180mA)
16.0H
20Hz - 90KHz
2.5
AD1, 2A3, 300B, KT-88(T)
11,500
S-325F
3.0K
44%
90mA (180mA)
18.0H
20Hz - 85KHz
2.5
PX-25, 2A3, 300B, 6550(T)
12,000
S-330F
3.5K
44%
90mA (180mA)
20.0H
25Hz - 80KHz
2.5
KT-90, KT99, KT-100
12,000
S-525F
5.0K
44%
90mA (180mA)
25.0H
25Hz - 80KHz
2.5
6550, KT-88, 50, 572, 811, 845
12,000
S-660F
6.6K
44%
90mA (180mA)
35.0H
25Hz - 70KHz
2.5
EL-34, KT-66, 6L6
12,000
S-825F
8.0K
n/a
80mA (160mA)
40.0H
25Hz - 45KHz
2.5
801A, VT-62
12,000
S-110F
10.0K
n/a
60mA (120mA)
45.0H
30Hz - 40KHz
2.5
211
14,500

A Series 1,000V Rating 2X+ current handling capability
Secondary Impedance: 0-4-8 ohm Rated Output Power:30W
Size : 11 cm x 13 cm x 11.5 cm
Model
Primary Coil
Inductance at 20Hz
7Vrms
Frequency Response (-3.0dB)
Source Impedance = Rp
Weight
(kg./ea)
Recommended Circuit
Price (pair)
THB
Ei construction
Impedance (Rp)
UL tap
Norminal DC current (max)
S-1000A
1.0K
n/a
250mA (500mA)
13.0H
18Hz - 100KHz
5.5
6C33C-B, 6080
17,500
S-1500A
1.5K
n/a
220mA (440mA)
15.0H
18Hz - 100KHz
5.5
300B Paralleled
17,500
S-2000A
2.0K
n/a
180mA (360mA)
18.0H
18Hz - 100KHz
5.5
EL-34, 6550, KT-88 Paralleled
17,500
S-2500A
2.5K
n/a
120mA (240mA)
20.0H
18Hz - 100KHz
5.5
100TH, 2A3, 300B
18,500
S-3000A   3.0K  44% 100mA (200mA)  22.0H  20Hz - 90KHz  5.5  300B   18,500
S-3500A
3.5K
44%
100mA (200mA)
23.0H
20Hz - 80KHz
5.5
PX-25, 300B
18,500
S-5000A
5.0K
44%
100mA (200mA)
30.0H
20Hz -70KHz
5.5
VV52, EL-156
18,500
S-6000A
6.6K
44%
100mA (200mA)
35.0H
20Hz - 60KHz
5.5
6550, KT-88
18,500
S-10000A
10.0K
n/a
90mA (180mA)
60.0H
25Hz - 40KHz
5.5
211
20,000

X Series 1,500V Rating 2.5X+ current handling capability
Secondary Impedance: 0-4-8-16 ohm Rated Output Power: 40W
Size : 13 cm x 15 cm x 16 cm
Model
Primary Coil
Inductance at 20Hz
7Vrms
Frequency Response (-3.0dB)
Source Impedance = Rp
Weight
(kg./ea)
Recommended Circuit
Price (pair)
THB
Ei construction
Impedance (Rp)
UL tap
Norminal DC current (max)
S-3X
3.0K
n/a
200mA (+500mA)
20.0H
15Hz - 70KHz
9
GU-81M
26,500
S-5X
5.0K
n/a
150mA (+380mA)
35.0H
15Hz - 40KHz
9
GM-70, 845, 211 Paralleled
30,000
S-10X
10.0K
n/a
100mA (+250mA)
65.0H
20Hz - 25KHz
9
805, 211, 845, GM-70
33,000






 
Push-Pull Output Transformer with "SILK Wounding" Technique
 
SILK Push-Pull Output Transformer is the Symmetrical Winding Technique which maximizes the balanced magnetic coupling in both push-pull coils. This new winding scheme offers very close DCR tolerance between middel tap to both end taps which will enable circuit designer and tube amp builder to create a tube amplifier achieving super low distortion, and easier bias adjustment in a very predictable way. With Symmetrical Winding Technique, circuit performance can be optimized ahead of time even during the design process which eliminate the need for complex fine tuning/testing process upon commencing the circuit. Moreover, we implement our new Genius Multiple Secondary Technology (0-4-8 ohm or 0-8-16 ohm) to all of the new SILK Push-Pull Output transformers. This will give both secondary taps to process the same specification. Custom design and OEM for push-pull output transformer are also accepted.  

E Series 500V Rating
Secondary Impedance: 0-4-8 ohm Rated Output Power: 15W
Size : 6.5 cm x 7 cm x 9.5 cm
Model
Primary Coil
Inductance at 50Hz
230Vrms
Frequency Response (-3.0dB)
(2) Source Imp = Plate to Plate / 2
Weight
(kg./ea)
Recommended Circuit
Price (pair)
THB
Ei construction
Impedance 
(Plate to Plate)
UL tap
Norminal DC current (max)
P-30-15A
3.0K
n/a
60mA (90mA)
+80H
15Hz - 70KHz
1.3
2A3, 6B4G
6,600
P-50-15A
5.0K
44%
60mA (90mA)
+100H
18Hz - 70KHz
1.3
45, 71A
7,200
P-60-15A
6.6K
44%
55mA (80mA)
+120H
20Hz - 70KHz
1.3
6BQ5, 6BM8
7,800
P-10K-15A
10.0K
44%
55mA (80mA)
+150H
20Hz - 60KHz
1.3
6F6, 6V6
7,800

R Series 750V Rating
Secondary Impedance: 0-4-8 ohm Rated Output Power: 40W
Size : 9.5 cm x 11 cm x9.5 cm
Model
Primary Coil
Inductance at 50Hz
230Vrms
Frequency Response (-3.0dB)
(2) Source Imp  = Plate to Plate / 2
Weight
(kg./ea)
Recommended Circuit
Price (pair)
THB
Ei construction
Impedance
(Plate to Plate)
UL tap
Norminal DC current (max)
P-510R
1.0K
n/a
120mA (240mA)
+60H
5Hz - 120KHz
2.5
6AS7, 12B4
12,000
P-520R
2.0K
n/a
120mA (240mA)
+90H
8Hz - 110KHz
2.5
4 x 2A3/6B4G
13,000
P-530R
3.0K
n/a
90mA (180mA)
+140H
8Hz - 110KHz
2.5
300B
14,500
P-545R
4.6K
44%
90mA (180mA)
+180H
10Hz - 100KHz
2.5
EL-34, 6CA7, 7591
14,500
P-550R   5.0K 44%  80mA (160mA)  +200H  12Hz - 100KHz  2.5  6550 (T), KT-88 (T)  15,000 
P-566R
6.6K
44%
80mA (160mA)
+220H
12Hz - 90KHz
2.5
6L6, 5881
15,500
P-580R
8.0K
44%
80mA (160mA)
+250H
16Hz - 90KHz
2.5
807, VT62/801A
15,500


 NC Series 1,000V Rating
Secondary Impedance: 0-4-8-16 ohm Rated Output Power: 100W
Size : 11 cm x 13 cm x 11.5 cm
Model
Primary Coil
Inductance at 50Hz
230Vrms
Frequency Response (-3.0dB)
(2) Source Imp = Plate to plate / 2
Weight
(kg./ea)
Recommended Circuit
Price (pair)
THB
C-core construction
Impedance
(Plate to Plate)
UL tap
Norminal DC current (max)
PC-2210N
1.0K
n/a
250mA (500mA)
+80H
5Hz - 100KHz
5.0
6C33-CB
22,000
PC-2220N
2.0K
44%
160mA (320mA)
+150H
5Hz - 90KHz
5.0
4 x EL34/6CA7
22,000
PC-2230N  3.0K  44%   140mA (280mA) +200H   5Hz - 85KHz  5.0 300B   23,000
PC-2250N
5.0K
44%
120mA (240mA)
+400H
8Hz - 80KHz
5.0
6550, KT-88, KT90
24,000
 PC-2266N  6.6K 44%  120mA (240mA)  +450H  10Hz - 70KHz   5.0 KT-120, EL-156 25,000 
PC-2210KN
10.0K
44%
120mA (240mA)
+500H
15Hz - 55KHz
5.0
211/845/GM-70
26,000