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| 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 |
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
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