They have been stored in a dry SoCAL home for more than 50 years! Each P-1 is in the original box wrapped in the original Kraft paper from UTC since made in the 60s. Each UTC P-1 dons a very attractive looking UTC P-1 metal badge on the top as seen in the pictures. Each transformer is carefully tested with the AC Source using a function generator and an oscilloscope.
Then, it is checked again on the impedance analyzer for the open / short turns on both the primary and secondary winding. I have recorded the test results before packaging them back in the original UTC boxes. I don't use ohmmeter or digital multi-meter to measure the DC resistance on the coils since the DC current from ohmmeter could temporarily magnetize the transformer core and can arguably effect the sound of these input transformers. Of course, you should not use ohmmeter on them as any knowledge T/T guy would NOT too. These are High Fidelity transformers with very wide bandwidth from 30Hz-20KHz according to the UTC data printed on the boxes.
UTC Data from 1970 UTC Catalog quoted the frequency response is within +1dB and -1dB for the quoted 30Hz-20KHz. You can't find a better made MC MM transformer than this for this given size! "P" series units are identical to the UTC Ouncer units but are sealed in bakelite housings with plug-in base to fit in the standard octal socket. While of submersion proof design, these units weight but two ounces. Oversize pins in the base make it impossible to dislodge these units from their sockets.
Size 1 3/32 diameter, 1 15/32 height, standard octal socket, 2 oz unpacked. Primary has low impedance of 50Ohm or 200/250/300Ohm or 500/600Ohm impedance but no permissible DC allowed.
Secondary has 50KOhm (50,000) impedance which is ideal for MC / MM step-up use. Of course, they were made here in the Good Old U. Return is NOT Accepted Due to the nature of the Vintage Item. I only sell the good parts and want to make sure you get the good parts.Please ask any questions you have before purchasing them! This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Parts & Accessories\Vintage Transformers". The seller is "buycompaq4less" and is located in this country: US.
This item can be shipped worldwide.