LL2785C: Lundahl Output Transformer

The Lundahl LL2785 C-core output transformers for tube amplifiers have a primary impedance of 3K with secondary impedances of 4R or 8R, depending on how you wire them up. There are options for circuit topology and core material, which you select when you purchase. suitable for the popular 300B electron tube

The transformers are highly sectioned with harmonically sized sections, which results in a minimum leakage inductance. Combined with a low capacitance coil winding technique, this results in a wide frequency range. The transformers have a special audio C-core of our Lundhal`s production, which is gapped for the desired DC current. This would depend on the current draw of the output valves. The transformers are of an open frame type and are suitable for mounting inside an amplifier housing.

The LL2785C is available in 3 versions. (The air-gap is adjusted during manufacture to suit)

• 60mA Single-ended
• 70mA Single-ended
• 90mA 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 2 versions depending on what C-core material you require.

• Silicon-iron
• Amorphous-iron (AM)

Depending on how the winding sections of the transformers are wired together via the exposed solder pins, the constructor can adjust the following primary and secondary impedances.

Primary impedance: Secondary impedance

• 3K: 5R or 8R

Overall dimensions including pins - 115mm x 87mm x 77mm

STARTING PRICE (1 off)
£229.48 +vat +p&p

Non-Stock Item - Please allow 4-6 weeks for dispatch