![]() ![]() ![]() ![]() That confirms my earlier thoughts, hard to say what the fitted output valve is, KT61, E元3 or maybe a 6P25 or 6V6g. At the moment, there are several of these on Ebay for quite high prices! So far, I have just brushed all the surface grime off it. I will probably remove the whole of the power supply, and get it working from an external source before thinking of making a new safe supply! The mains appears to go straight the chassis and the metal rectifier. The orange transformer just seems to supply the heaters, and the wires from it, to the heaters are just poked through two very small holes drilled in the chassis without any pretence at insulation beyond the covering on the wires (cracked and brittle). So the first two match up, so it looks like the unmarked output valve in an E元3! The BVA valve equivalents are:īVA273 = ECH35, BVA243 = EF39, BVA264 = E元3. (07-02-2017, 03:17 PM)Sparks Wrote: I have looked into it a bit more, and got a circuit from online. OK, let's get this straight right from the start, I do know that the Mullard E元3 is actually a pentode but it’s both pin and electrically equivalent as well as being easier to drive whilst showing lower intermodulation distortion and was introduced at the same time as the KT61 in 1939. ![]()
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