Pair of OT25SE-HF-3K5-UL (HiFi) SE Output Xfmr 20VA 3K5x4/8Ohm 90mADC

  

OT25SE-HF-3K5UL Pair for HiFi projects USA built version installed in EI 1-1/4 Black End Bells- fully shielded. This is a new 20VA Single-Ended Tube Output transformer for tube amplifier circuit applications (30Hz to 20KHz) using large bottle power tubes. This version of the transformer is built in USA to an MPS custom design specs & is suitable for many 12 to 20VA Single-Ended HiFi amp circuits looking for a solid USA built output transformer at a reasonable price. We are using audio grade Z11 laminations in an E-I 1.25 x1.75IN gapped core structure with bobbin wound construction. It's a 5x interleaved winding with 3K5 Ohm input (w/40% UL Tap) and dual 4 & 8 ohm output impedances. It's surface mounts by a 4-hole pattern at 2.5in x 2.75in. CONSTRUCTION DETAILS - Laminations: 35Q155 (Z11) x EI-1.25IN Bobbin: EI-1-1/4 1 x 1.75 gapped butt stack, Nylon Glass Reinforced UL94V-0 Winding: 5 layer split interleave, perfect layer output windings & with UL screen tap input at 40% wrt B+ Magnet Wire: MW80 155C or higher Varnish- Class B 130C Tapes: 3M #1350F & 3M 27 Glass cloth tapes Cover: Black Full Flange End Bell covers Weight: 5.6 Lbs each. Operating Voltage 600 Vdc Maximum Output Power: 20 VA (90mADC) Designed Operating Frequency (+/-1dB): 30 to 20000 Hz.

HiPot Test Ratings 1000Vac minumum Input Impedance B+ to Plate: 3500 Ohms with 40% UL Tap Output Impedances: 4,8 Ohms Application: 12 to 20W SE Amplifiers.