Vintage 1979 Tamura Tamradio F-Series Studio Audio Transformer 118e648 - TESTED For Sale

Vintage 1979 Tamura Tamradio F-Series Studio Audio Transformer 118e648 - TESTED.
Used / Tested Working (In excellent structural health. Fully encapsulated housing protects the internal core perfectly. Leads are intact, and coils have been fully verified with a digital multimeter).Item DescriptionUp for sale is a rare, ultra-premium Vintage May 1979 Tamura (Tamradio) F-Series Studio In-Line Audio Transformer.This is a highly specialized internal OEM broadcast/studio module custom-manufactured in Japan during the golden era of high-fidelity audio. It features a fully enclosed, horizontally shielded in-line design with physical winding separation to deliver maximum noise isolation and zero crosstalk.This unit is marked with the legendary solitary \"F\" Stamp, confirming it belongs to Tamura’s premier class of ultra-low-distortion audio grade cores (highly sought after for building custom microphone preamps, moving-coil (MC) phono step-up stages, or restoring vintage Japanese mixing consoles).Complete Authentication & Stamping Data:Side 1 Marks: 22H031H / TAMRADIOSide 2 Marks: 118e648 / F / 7921 (Authenticated to the 21st week of 1979)Sides 3 & 4: Clean/Blank (Industrial flush-mount frame)Multimeter DC Resistance Bench Test (100% Healthy):Primary Input Winding (Black to Black wires): Reads a rock-solid 9.5 ΩSecondary Output Winding A (Red to Red wires): Reads 0.4 ΩSecondary Output Winding B (Blue to Blue wires): Reads 0.4 ΩIsolation Check: Fully tested cross-continuity. Perfect open loop (OL) between all independent color pairs, confirming zero internal shorts or insulation breakdown.This is a beautiful, working single specimen of historic Japanese audio iron. It will be packed securely and shipped quickly with tracking. Please check the photos to confirm physical orientation and layout. Thanks for looking!