Douglas M4927 transformer. Suitable for push-pull anplifiers using KT88, EL34,KT66,6L6 amongst others. Spec. Dual 0-120v primaries (for 120-240 volt operation). HT: 335v @ 400mA Bias: 65v @ 100mA Heater: 6.3@ 5A . 200VA. Suitable replacement for most 50-8o Watt valve guitar or Hi-Fi units. Can even be used to repair many amplifiers for which it may not be directly suitable by making some minor circuit changes. If you are not sure whether it will work for your needs, contact me and I will either help you with circuit changes or tell you that it will not be suitable. This is a heavy item. Cheaper shipping option now available when buying more than one transformer. Contact me for details.