A high performance, high ratio, audio signal transformer for microphone level input applications. Useful for providing a 3, 9 or 15 dB gain for any high impedance input. Suitable for any source balanced or unbalanced not exceeding 10kΩ.
Ratio: (1+1):(4+4) Impedance: 1.2k:9.6k, 1.2k:2.4k, 300:2.4k, 300:9.6k Frequency Response @10kΩ source 20kΩ load: +/- 0.5 dB 15 Hz to 80 kHz (Ap) Primary Iinductance (series): 18H Secondary Iinductance (series): 550H Total DC Resistance PIR: 80Ω Total DC Resistance SEC: 500Ω Max Level: @50Hz: +13 dBu Mu-Metal, High Nickel Core, 79% Nickel Steel lamination ⌷
The UTM2581 is a line level to high impedance tube stage input transformer. It works perfectly as a Vari Mu input transformer with the secondary CT. 600:15CTk, 1:5 ratio.
The UTM3510 is a line-level, clamped output transformer, 10k:600Ω, 4:1 ratio. Recommended for any kind of tube output amplifiers, including SRPP circuits. It's equipped with 150mm color leads.
The UTM3505 is a line-level, low-profile, output UNGAPPED transformer, 300Ω:600Ω (1:2). Dedicated for UREI 1176, rev F-H, including Gyraf's project. Fits in 500-series modules.
This is 1:10 or 1:20 mic, high ratio, 150/600:50k, transformer. Recommended for vintage Telefunken V72 circuits. Also suitable as a high-ratio input transformer with high level capability for tube mic...
UTM_Catalog2A.pdf 
