Interstage, headphone and line output transformers
Model
Turns
Ratio
Comments
Price
USD
1+1:1+1
Noninverting interstage / anode choke
106.00
1+1:1+1
Interstage. Preferably push pull to push pull. The LL1635 are an old designs and not well
suited for SE applications. We recommend LL1635/5mA for push-pull preamplifier stages
where some DC imbalance might occur. The LL1635 data sheet is updated to reflect some
limitations in it's use.
112.00
1+1:1+1:
2.5+2.5 
Interstage and line output.

115.00
2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance.

138.00
2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance.
Amorphous core.
289.00
LL1660SAg
2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance.
Silver wire.
2981.00
LL1660SAgAM
  2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance.
Silver wire and amorphous core.
3204.00
LL1660AM
2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance.
Amorphous core.
266.00
LL1660Ag
2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance.
Silver wire.
2947.00
LL1660AgAM
2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance.
Silver wire and amorphous core.
3171.00
1+1+1+1:2+2
High current interstage
112.00
1+1+1+1:4+4
High current interstage transformer (For 300B driving tube).
122.00
1.75+1.75:1+1+1+1
Interstage transformer. Compromise between the LL1660 and the LL1671.
115.00
LL1692AAM
1.75+1.75:1+1+1+1
Interstage transformer. Compromise between the LL1660 and the LL1671, amorphous core.
266.00
LL1692AgAM
1.75+1.75:1+1+1+1
Interstage transformer. Compromise between the LL1660 and the LL1671, silver wire and amorphous core
2947.00
1+1:2+2
Stepup 1:2 interstage transformer, designed for two stage amplifiers.
150.00
LL2746AM
1+1:2+2
Stepup 1:2 interstage transformer, designed for two stage amplifiers, amorphous core
329.00
LL2746Ag
1+1:2+2
Stepup 1:2 interstage transformer, designed for two stage amplifiers, silver wire
3941.00
1+1:1+1
For single end to single end application
150.00
LL2753AM
1+1:1+1
For single end to single end application, amorphous core
329.00
LL2753Ag
1+1:1+1
For single end to single end application, silver wire
2949.00
1+1:1+1
For single end to single end applications. High impedance version compared to LL2753.
156.00
1+1:1+1
Modified 1660 for SE to SE applications
115.00
LL2762AM
1+1:1+1
Modified 1660 for SE to SE applications, amorphous core
266.00
LL2762Ag
1+1:1+1
Modified 1660 for SE to SE applications, silver wire
2594.00
LL2672AgAM
1+1:1+1
Modified 1660 for SE to SE applicationssilver wire and amorphous core
2818.00
Our tube amplifier transformers are built in our dual coil single C-core style and can be ordered with a choice of core air-gap for Push-Pull or Single-Ended applications. For the comprehensive list of sub-types, please click here.
The use of C-cores with well-defined air-gap results in an almost constant inductance throughout the whole operating voltage range. For SE transformers, the primary inductance variation due to signal level is less than 7%.
Most of the transformers below are available with amorphous iron C-cores. The amorphous cores are considered to have sonic advantages, but the signal level capability with amorphous core is about 30% less than with a conventional silicon-iron C-core.



Interstage Transformers
Line Output
Model
Turns
Ratio
Comments
Price
USD
7.2+7.2:1+1
Line output, primarily for push pull drive. The LL1630 are an old designs and not well suited for SE applications.
We recommend LL1630/5mA for push-pull preamplifier stages where some DC imbalance might occur.
141.00
9+9:1+1+1+1
Line output transformer based on the UTC LS-27 specifications
136.00
9+9:1+1+1+1
Line output transformer based on the LL1660 size and structure
130.00
LL1689AM
9+9:1+1+1+1
Line output transformer based on the LL1660 size and structure, amorphous core
281.00
LL1689Ag
9+9:1+1+1+1
Line output transformer based on the LL1660 size and structure, silver wire
2970.00
LL1689AgAM
9+9:1+1+1+1
Line output transformer based on the LL1660 size and structure, silver wire and amorphous core
3194.00
5.8+5.8:1+1
Mu metal core transformer for DC free (parafeed) line output
69.00
1+1:1+1
Low impedance line output transformer
112.00
2.8+2.8:
1+1+1+1
Line output
130.00
2+2:1+1+1+1
Small size low impedance line output transformer, normally used 1:1
106.00
4+4:1+1+1+1
Line output transformer based on the LL1660 size and structure. Available in copper or silver wire versions.
Price here is for copper.
130.00
LL2763AM
4+4:1+1+1+1
Line output transformer based on the LL1660 size and structure. Available in copper or silver wire versions.
Price here is for copper, amorphous core.
281.00
LL2763Ag
4+4:1+1+1+1
Line output transformer based on the LL1660 size and structure. Available in copper or silver wire versions.
Price here is for copper, silver wire.
2580.00
LL2763AgAM
4+4:1+1+1+1
Line output transformer based on the LL1660 size and structure. Available in copper or silver wire versions.
Price here is for copper, silver wire and amorphous core.
2804.00
4+4:1+1+1+1
Line output transformer with Nanocrystalline C-core, suitable for preamps, phono stages etc
406.00
Model
Turns
Ratio
Comments
Price
USD
1+1:1+1
For low impedance sources
112.00
6+6:1+1
Primary impedance approx. 5k with 32, 150 or 600 ohm headphones
130.00
      "            
Same as the LL2765 above but with an Amorphous core
310.00
      "
Same as the LL2765 above using silver wire
3142.00
      "
Same as the LL2765 above using silver wire as well as an Amorphous core.
3410.00
6.8+6.8:
1+1+1+1
For 3k primary impedance to 16, 64 and 300 ohms
127.00
Headphone Output Transformers
To place an order, please click here