LL1671: Lundahl Interstage and Line Output Transformer
LL1671 is a high-current interstage / line output transformer for tube amplifiers. The transformer has various core air gaps optimised for PP or SE drives. To achieve the best high-frequency performance, the transformer is wound with a special low-capacitance winding technique. The transformer has a special high flux, low distortion audio C-core of our own production. The LL1671PP is assembled with a small core air gap to allow for some DC current unbalance. For the S.E. versions of the LL1671, the core air gap is chosen such that the denoted DC current (30mA for a LL1671/30mA) generates a no signal core flux density of 0.9 Tesla when used with all primaries in series. This leaves a flux density swing of 0.7 T for the signal.
The LL1671 is available in 2 versions to suit the circuit topology. (The air gap is adjusted during manufacture to suit)
- Push-Pull
- 30mA Single-ended
(N.B. The purpose of the airgap is to accept the DC current of the output valve without saturating the core, leaving enough headroom for the sound signal)
There are further 3 versions depending on what C-core material you require.
- Silicon-iron (STANDARD)
- Amorphous-iron (AM)
- Nanocrystalline (NC)
Turns ratio
- 1 + 1 + 1 + 1 : 2 + 2
Overall size including pins - 73mm x 61mm x 53mm
STARTING PRICE (1 off)
£89.26 +vat +p&p
Non-Stock Item - Please allow 4-6 weeks for dispatch
For more information, please refer to the datasheet below.