Lundahl Transformer
Manufacturer of  Ultra High Quality Audio Transformers

  Introduction (the Part number below, is the same as in the pricelist
Part 1
  Tube Power Supply Chokes)
Part14..20
  Tube Output
Part 2
  Filament Chokes / High Current Chokes
  Tube Mains transformers with DC cancellation
Part 3
  Plate (anode)  Chokes
Part 22
  Mains Cleaning transformers with DC cancellation
Part 4
  Grid Choke
Part 23
  Various transformers, not mentioned here
Part 5
  Interstage      
Part 6
  Signal Input      
Part 7
  Signal Output      
Part 9
  Moving Coil      
Part 10
  Guitar Input      
Part 11
 

Microphone

Tech Info
  Product Storage
Part 12
  For Digital Audio. Finest Quality.
Tech Info
  Amorph Cores
Part 13
  Interconnect Solutions
Tech Info
  DATASHEET DOWNLOAD

 

Mains transformers (SCROLL down to read below)

In the Lundahl  C-core mains transformers, an air gap is used. This is to compensate very low frequency (like 0.5Hz, similar to DC unbalance) in the mains outlet. This can be caused by heavy load changes on the mains net, and for HiFi use you expect no noises from that in your amplifier.

Secondary voltages listed, are no-load voltages. This is useful for the filament voltages. Voltage drop will result from the load of the windings. How much that is, can be calculated from copper resistance the winding you use, and the current you draw from it. Just use ohm's law. In practice the 6.6V will result in 6.3Volt on the tubes with full load. Thus compensating also a small voltage drop on the tube sockets.

Electrical size is estimated to 250VA, which can be increased with good cooling. For optimized use, about 75% of power should be taken from secondary 1. Primaries should be connected in series for 210 - 250 V, in parallel for 105 - 125V. Table entries are calculated for primary voltage 230 V. 

Type  Secondary 1 Secondary 2 and 3 Secondary 4 and 5  Secondary 6 
LL1648 350V  5.9V  6.6V 
LL1649 230V  6.6V  6.6V 
LL1650 350V  6.6V  6.6V 
LL1651 500V  6.6V  6.6V
LL1683 250V / 0.16mA 6.6V / 3A 5.2V / 3A 48V / 0.1A

Application Information:

What makes a Lundahl mains transformer so unique?

Why Lundahl mains transformers have an air gap

Where quality and transformers meet

What makes Lundahl transformers so special

hybrid power supply principle.


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