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These cookies ensure basic functionalities and security features of the website, anonymously. Regardless of the root cause of the one channel distorting, I wouldn't gamble with the well-being of your new Mullards.Necessary cookies are absolutely essential for the website to function properly. That can be a sign of previous overheating which _might_ have been the result of the tube operating out of parameters and drawing excessive current. One hint that your radio might suffer that condition is that you stated one of the original output tubes was cracked. I advise you to, at the least, have the two coupling capacitors (one for each channel/ tube)-replaced before operating your radio any more.Ī matched pair of Mullard EL84s is not cheap, and if allowed to play in a circuit with a leaky coupling capacitor(s) may well damage your new tubes OR burn out the hard-to-get output transformers. Regarding your distortion of one channel: Shortly after your radio was made, the speaker plugs and jacks were of the DIN variety, with a centered flat bar and offset pin. (VDE standard.) The third pin was used on the speaker plugs to prevent plugging the speakers into a 220 volts mains supply! I'll explain:įor some unknown reason (to me) the German radio industry designed speaker plugs and jacks using the same round pins and spacing as the simple two-pronged electrical outlets of the era. The third hole on the speaker jacks is likely for the safety pin on the corresponding German old style speaker plugs.
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