Interstage, headphone and line output transformers
 Model
Turns
Ratio
Comments
Price
USD
1+1:1+1
Noninverting interstage / anode choke
118.00
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.
126.00
1+1:1+1:
2.5+2.5 
Interstage and line output.
 
128.00
LL1660NC
  1+1:1+1:
2.5+2.5
Interstage and line output with nanocrystalline core
313.00
2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance.
 
153.00
LL1660SNC
2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance with nanocrystalline core.
339.00
2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance.
Amorphous core.
320.00
LL1660SAg
2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance.
Silver wire.
3377.00
LL1660SAgAM
  2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance.
Silver wire and amorphous core.
3630.00
LL1660AM
2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance.
Amorphous core.
295.00
LL1660Ag
2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance.
Silver wire.
3337.00
LL1660AgAM
2.5+2.5:2+2
SE - PP and PP - PP Interstage. Internal Faraday shields for improved balance.
Silver wire and amorphous core.
3591.00
1+1+1+1:2+2
High current interstage
126.00
LL1671AM
1+1+1+1:2+2
High current interstage, amorphous core
296.00
LL1671NC
1+1+1+1:2+2
High current interstage, with nanocrystalline core
311.00
1+1+1+1:4+4
High current interstage transformer (For 300B driving tube).
136.00
LL1677NC
1+1+1+1:4+4
High current interstage transformer (For 300B driving tube) with nanocrystalline core
321.00
1.75+1.75:1+1+1+1
Interstage transformer. Compromise between the LL1660 and the LL1671.
128.00
LL1692ANC
1.75+1.75:1+1+1+1
Interstage transformer. Compromise between the LL1660 and the LL1671, with nanocrystalline core.
313.00
LL1692AAM
1.75+1.75:1+1+1+1
Interstage transformer. Compromise between the LL1660 and the LL1671, amorphous core.
295.00
LL1692AAgAM
1.75+1.75:1+1+1+1
Interstage transformer. Compromise between the LL1660 and the LL1671, silver wire and amorphous core
3589.00
1+1:2+2
Stepup 1:2 interstage transformer, designed for two stage amplifiers.
168.00
LL2746AM
1+1:2+2
Stepup 1:2 interstage transformer, designed for two stage amplifiers, amorphous core
366.00
LL2746Ag
1+1:2+2
Stepup 1:2 interstage transformer, designed for two stage amplifiers, silver wire
4463.00
1+1:1+1
For single end to single end application
168.00
LL2753AM
1+1:1+1
For single end to single end application, amorphous core
367.00
LL2753Ag
1+1:1+1
For single end to single end application, silver wire
3340.00
1+1:1+1
For single end to single end applications. High impedance version compared to LL2753.
175.00
1+1:1+1
Modified 1660 for SE to SE applications
128.00
LL2762NC
  1+1:1+1
Modified 1660 for SE to SE applications with nanocrystalline core
313.00
LL2762AM
1+1:1+1
Modified 1660 for SE to SE applications, amorphous core
296.00
LL2762Ag
1+1:1+1
Modified 1660 for SE to SE applications, silver wire
2939.00
LL2762AgAM
1+1:1+1
Modified 1660 for SE to SE applicationssilver wire and amorphous core
3191.00
Our tube amplifier transformers are built to order 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.
157.00
9+9:1+1+1+1
Line output transformer based on the UTC LS-27 specifications
151.00
9+9:1+1+1+1
Line output transformer based on the LL1660 size and structure
145.00
LL1689AM
9+9:1+1+1+1
Line output transformer based on the LL1660 size and structure, amorphous core
312.00
LL1689Ag
9+9:1+1+1+1
Line output transformer based on the LL1660 size and structure, silver wire
3364.00
LL1689AgAM
9+9:1+1+1+1
Line output transformer based on the LL1660 size and structure, silver wire and amorphous core
3616.00
5.8+5.8:1+1
Mu metal core transformer for DC free (parafeed) line output
77.00
1+1:1+1
Low impedance line output transformer
126.00
2.8+2.8:
1+1+1+1
Line output
146.00
LL2745NC
2.8+2.8:
1+1+1+1
Line ouptut with nanocrystalline core
331.00
2+2:1+1+1+1
Small size low impedance line output transformer, normally used 1:1
128.00
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.
146.00
LL2763NC
4+4:1+1+1+1
  Line output transformer based on the LL1660 size and structure. Available in copper or silver wire versions with nanocrystalline core. Price here is for coppe,. with nanocrystalline core
331.00
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.
312.00
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.
2924.00
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.
3176.00
4+4:1+1+1+1
Line output transformer with Nanocrystalline C-core, suitable for preamps, phono stages etc
4468.00
 Model
 Turns
Ratio
Comments
Price
USD
1+1:1+1
For low impedance sources
126.00
6+6:1+1
Primary impedance approx. 5k with 32, 150 or 600 ohm headphones
145.00
      "             
Same as the LL2765 above but with an Amorphous core
345.00
      "
Same as the LL2765 above using silver wire
3559.00
      "
Same as the LL2765 above using silver wire as well as an Amorphous core.
3861.00
6.8+6.8:
1+1+1+1
For 3k primary impedance to 16, 64 and 300 ohms
143.00
Headphone Output Transformers
To place an order, please send your inquiry with your complete shipping address to erhardaudio@gmail.com, thank you.