Audio Matching Transformer Center Tapped Both Windings Various Types 42TL 42TM Xicon

This is one item of new audio matching transformer in various types manufactured by Xicon. I can only get stock of the items shown in the variations list.

Broadly they come in two sizes. The 42TL range are the smaller sub-miniature type. The 42TM range are the more standard size, similar to the old Eagle LT700 and LT44. The primary side is marked on the bobbin tape with a "P." Mechanical diagrams are shown in the secondary pictures.

All have centre taps on both windings and this can be very useful for making ring modulators where you might want to have a different impedance on the side with the diode ring. The highest ratio type 42TM117RC (50K to 1K impedance ratio) is useful for audio impedance matching to ceramic earpieces or to 1K / 600 Ohm moving coil headphones in crystal set radios. Some types have applications in matching to guitar pickups, or isolating long lines to avoid hum loops on amplifiers. The soft metal legs are quite long which allows easy connection using terminal strips. They have also been used on guitar tone control boards where use is made of the inherent leakage inductances.

Note that the winding complex impedances are measured at 1kHz and shown in Ohms. This is not what you will measure with a simple multimeter using direct current. This D.C. resistance is typically a much lower value than the 1kHz A.C. impedance as seen in the tables in the secondary pictures. (An 8 Ohm output impedance transformer would not be much use if it had a D.C. resistance of 8 Ohms)

If you are looking for the modern versions of the LT700 output and the LT44 inter-stage transformers, they are available on another listing in my Etsy shop.
The colour of the cover tape on the various types may not be that shown in these pictures.

Checkout is via the Etsy system. If you would like to buy *any* additional item in the shop, discount codes are available for use within shopping cart at the Etsy checkout. These are,

2 or more items, save 10% with promo code SAVE10
3 or more items, save 10% with promo code SAVE15
4 or more items, save 10% with promo code SAVE20

The vast majority of small items will not usually attract any more postage charges. Please use shopping cart and checkout everything altogether with the promotion code for the best deal.