SOWTER TYPE UA21


PUSH-PULL OUTPUT TRANSFORMER
for EL34 CATHODE BIAS UL

MULLARD 20W, LEAK STEREO 20
 Rl = 6600 Ohms

PACKAGE PACKAGE OPTIONS PART NUMBER
SIZE "N"

4.9 Kg

Fully shrouded UA21-S
Drop through UA21-T
Open frame UA21-O
APPLICATION A conservatively designed Push-Pull output transformer for use with two  pairs of El34 or similar valves in  Ultra Linear mode with or without overall negative feedback. For MULLARD 20W, LEAK STEREO 20
FEATURES  A 2inch Grain Oriented (M6) laminated core for minimal losses and distortion. 14 section interleaved primary and secondary windings to give excellent bandwidth.  Two chamber bobbin ensures full capacity and resistance balance to eliminate distortion caused by transformer unbalance.  Low copper resistance to minimize losses and maximize loudspeaker damping.  4 separate secondary windings (See below) for optimum matching to load without the use of tapped windings which can reduce HF response.  Other secondary configurations available at time of order. Various package options.
POWER RATING 40 Watts at 20 Hz. 
  Primary Secondary
Nominal winding impedance 6600 ohms 4/8/16 ohms
Inductance 145 H 0.35 mH
DC Resistance 192 ohms 0.59 ohms
Leakage inductance 4.4 mH ref primary
DC current per side 120 mA max
Ratio (8 ohm configuration) 20.31 :1
Bandwidth 5 Hz to 50 KHz (-3 dB points typical)
Total Harmonic Distortion 0.05 % at 1 kHz full power
CONNECTIONS
E A Sowter Ltd
The Boatyard, Cullingham Road
IPSWICH IP1 2EG England
Tel: +44(0)1473 252794
Fax: +44(0)1473 236188
E-Mail sales@sowter.co.uk