ruffrecords
Well-known member
The OEP A262A2E is a small 150:600 ohm input transformer with split winding so it can be wired 600:2400 if you wish. I have not paid this transformer any attention until I saw it used as an OUTPUT transformer wired 2400:600 in a 500 series all tube mic pre by gemini86 (Rodney) here:
https://groupdiy.com/index.php?topic=51020.msg647656#msg647656
The A262A2E is specified to 100mW at 300Hz which is +20dBm - quite respectable, but only 1mW at 30Hz which is 0dBm - not so good. So I thought it was worth buying one an putting it through its paces. It arrived yesterday. All I have tine to do was measure the inductance at 100Hz with the windings in series (2400;600). Primary was about 10H and the secondary was about 2.5H. Perhaps not as high as they should b but, if the core is all iron, the inductance will rise at lower frequencies to the LF response might be OK. Tonight I will have a go at measuring its frequency response at 0dBu. Then I will move on to distortion.
Cheers
ian
https://groupdiy.com/index.php?topic=51020.msg647656#msg647656
The A262A2E is specified to 100mW at 300Hz which is +20dBm - quite respectable, but only 1mW at 30Hz which is 0dBm - not so good. So I thought it was worth buying one an putting it through its paces. It arrived yesterday. All I have tine to do was measure the inductance at 100Hz with the windings in series (2400;600). Primary was about 10H and the secondary was about 2.5H. Perhaps not as high as they should b but, if the core is all iron, the inductance will rise at lower frequencies to the LF response might be OK. Tonight I will have a go at measuring its frequency response at 0dBu. Then I will move on to distortion.
Cheers
ian