6ca4 vs ez81. Visit us now! Order Electro-Harmonix 6CA4 / EZ81 rectifier vacuum tubes online, in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier. But I did have a EZ80/6V4, which I tried in the amp. I'm also TOTALLY OPEN to using other good 6. I did some research and though 6V4 and 6CA4 shows as compatible, it appears they have different handling characteristics for current and so on. The amp still sounds distorted still. The amp has been rebuilt, as of last year. Our tubes are always tested, matched and guaranteed. In use the maximum reservoir capacitor would be limited to 50 µF and to prevent damage by excess current an effective series resistance of 230 Ohms is used. 0A. EZ81 RFT rectifier tube. 2ig sc7o mx jpe 2f io7 tlvab 6lhpuy bgg0 luon