LL1692A: Lundahl Interstage and Line Output Transformer
LL1692A is an interstage transformer for tube amplifiers, impedance-wise placed between LL1660 and LL1671. LL1692A 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. It has a special high flux, low distortion audio C-core of our own production. The Push-Pull version is assembled with a small core air gap to allow for some DC current unbalance. For the S.E. versions of the LL1692A, the core air gap is chosen such that the denoted DC current (18mA for a LL1692A/18mA) 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 approx. 0.7 T for the signal.
The LL1692A is available in 2 versions to suit the circuit topology. (The air gap is adjusted during manufacture to suit)
- Push-Pull
- 18mA 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)
And a further 2 options depending on what wire you require.
- Copper
- Silver (Ag)
Turns ratio
- 1 + 1 + 1 + 1 : 1.75 + 1.75
Overall size including pins - 73mm x 65mm x 53mm
STARTING PRICE (1 off)
£90.59 +vat +p&p
Non-Stock Item - Please allow 4-6 weeks for dispatch
For more information, please refer to the datasheet below.