Power and audio output transformers for Pete Millett's "Jonokuchi" Desktop headphone / speaker amp using 13EM7 tubes.
A desktop tube headphone amplifier design that can also drive small, efficient speakers (like computer speakers)using 13EM7 tubes designed by Pete Millett. For more information, schematics and circuit boards see Pete Millett's DIY Audio pages on the "Jonokuchi". Circuit boards for this project can be found on Pete Millett's ebay store.
The XPWR168 power transformer was specially designed and built for this amplifier. It is a 120V or 240V, 50/60Hz. line to 275V (137.5-0-137.5) at 125mA and 13V (6.5-0-5) at 900mA center tapped. The Transformer also has an outer copper shield around the windings and core to help eliminate outside interference.
Audio Output Transformers
There are two GXSE10-8K singled ended output transformers. 10W, single ended tube output transformer for 8K Ohms to your choice of 4, 6, 8, or 16 Ohms.
All units are wound with the finest virgin copper magnet wire. All windings use heavy insulated wire to provide excellent manufacturing yield, lower customer cost and superior life.
EDCOR uses the finest M6 line grain oriented steel cores. Each unit is hand stacked to assure at least 92% stack.
Injection molded Nylon 6/6 with the addition of 30%-35% glass fibers. The addition of glass fibers allows a higher heat deflection temperature and it brings the material to a class HB UL temperature classification.
The terminations are UL1015 color coded lead wire.
These transformers comes with steel end bells for mounting with the use of screws. See dimensional drawings on product pages.