LL3720: Lundahl Output Transformer

The Lundahl LL3720 C-core output transformers for tube amplifiers have a primary impedance of 6K with secondary impedances of 8R, depending on how you wire them up. There are options for circuit topology, which you select when you purchase.

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 LL3720 is available in 2 versions. (The air-gap is adjusted during manufacture to suit)

• 40mA Single-ended
• 70mA 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)

Primary impedance: Secondary impedance

• 6K: 8R

Overall dimensions including pins - 95mm x 75mm x 50mm

PRICE (1 off)
£156.89 +vat +p&p

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