Silk Interstage
 
 

 

 

Experiencing new sound level from your vacuum tube circuit

SILK hand wound Interstage coupling Transformer offers variety of impedance and connections to suite your application.

SILK Interstage transformers are best characterized by:

1. Wide bandwidth due to special winding arrangement for each particular design and impedance
2. Best low frequency response due to its high inductance compare to its competitors (2-3 times lower in THD at 20Hz is typical for SILK interstage)
3. Best high frequency response even when apply direct current up to 2.5 times its competitors allowing the use of low Zp tube with high current requirement
4. Very tight unit to unit, coil to coil tolerance in terms of response curve, inductance, DCR and square wave shape
5. Designed and Developed under real tube circuit to be used
6. Custom design available

We select the best material and wind them with most sophisticate ways with precision to generate best signal transfer and reserve sonic purity to the highest level. Our SILK Interstage transformer is potted in beautiful cover with shield for minimum noise. The connections are made via terminal lugs underneath.

 
  Interstage Single Ended Series
I-S Series 500V Rating
Model
Primary Coil
Turn Ratio
Inductance at 20Hz
7Vrms
Secondary Impedance
Frequency Response
(-3.0dB) 
Recommended Circuit
Price (pair) THB
Ei construction
Impedance
Norminal DC current (max)
I-311S-2A3
2.5K
40mA (60mA)
1:1
20H
2.5K
20Hz - 55KHz
2A3, EL34(T), 12B4
11,500
I-311S
3.0K
30mA (45mA)
1:1
25H
3.0K
20Hz - 50KHz
6BL7, 6BX7, 437A, 6C45Pi
9,800
I-311SD
3.0K
30mA (45mA)
1:0.5+0.5
25H
750R+750R
20Hz - 50KHz
SE to PP or A2 drive circuit
10,500
I-311S-300
3.0K
60mA (90mA)
1:1
30H
3.0K
20Hz - 50KHz
300B
15,000
I-511S
5.0K
25mA (36mA)
1:1
35H
5.0K
20Hz - 45KHz
5687, 417A, 6DJ8/6922
9,800
I-511SD
5.0K
25mA (36mA)
1:0.5+0.5
35H
1.25K+1.25K
20Hz - 45KHz
SE to PP or A2 drive circuit
10,500
I-912S
10.0K
10mA (15mA)
1:2
55H
40.0K
25Hz - 25KHz
6SN7, 12AU7, 12BH7, 5692
9,800
 
  Interstage Push-Pull Series
I-P Series 500V Rating
Model
Primary Coil
Turn Ratio
Inductance at 20Hz
7Vrms
Secondary Impedance
Frequency Response
(-3.0dB) 
Recommended Circuit
Price (pair) THB
Ei construction
Impedance
Norminal DC current (max)
I-311P
3.0K
30mA (45mA)
1CT:0.5+0.5
40H
750R+750R
15Hz - 40KHz
6BL7, 6BX7, 437A, 6C45Pi
10,500
I-511P
5.0K
25mA (36mA)
1CT:0.5+0.5
60H
1.25K+1.25K
15Hz - 35KHz
5687, 6922, 417A, 6F6(T), 6V6(T)
10,500
 
  Pre-amp Line Output (SE) Series with Balanced (XLR) secondary
L-S Series 500V Rating
Model
Primary Coil
Turn Ratio
Inductance at 20Hz
7Vrms
Secondary Impedance
Frequency Response
(-3.0dB) 
Recommended Circuit
Price (pair) THB
Ei construction
Impedance
Norminal DC current (max)
L-531S
5.0K
25mA (36mA)
1:0.165+0.165
35H
150R+150R
25Hz - 55KHz
6922, 5687, 417A, 6C45Pi, 437A
10,500
L-941S
10.0K
10mA (15mA)
1:0.125+0.125
55H
150R+150R
30Hz - 30KHz
6CG7, 12AU7, 6SN7, 12BH7
10,500
L-1551S  15.0K   5mA (10mA) 1:0.1+0.1  70H  150R+150R  35Hz - 25KHz  26  10,500 
 
  Pre-amp Line Output (PP) Series with Balanced (XLR) secondary
L-P Series 500V Rating
Model
Primary Coil
Turn Ratio
Inductance at 20Hz
7Vrms
Secondary Impedance
Frequency Response
(-3.0dB) 
Recommended Circuit
Price (pair) THB
Ei construction
Impedance
Norminal DC current (max)
L-531P
5.0K
25mA (36mA)
1CT:0.165+0.165
55H
150R+150R
15Hz - 55KHz
6922, 5687, 417A, 6C45Pi, 437A
10,500
L-941P
10.0K
10mA (15mA)
1CT:0.125+0.1255
95H
150R+150R
15Hz - 30KHz
6CG7, 12AU7, 6SN7, 12BH7
10,500