07-02-2017, 03:17 PM
I have looked into it a bit more, and got a circuit from online. The BVA valve equivalents are:
BVA273 = ECH35, BVA243 = EF39, BVA264 = EL33. So the first two match up, so it looks like the unmarked output valve in an EL33!
It does seem to be modified. 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). The mains appears to go straight the chassis and the metal rectifier. (Live chassis - Aaargh!). 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!
So far, I have just brushed all the surface grime off it. The cabinet is in fair condition. At the moment, there are several of these on Ebay for quite high prices!
Bob
BVA273 = ECH35, BVA243 = EF39, BVA264 = EL33. So the first two match up, so it looks like the unmarked output valve in an EL33!
It does seem to be modified. 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). The mains appears to go straight the chassis and the metal rectifier. (Live chassis - Aaargh!). 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!
So far, I have just brushed all the surface grime off it. The cabinet is in fair condition. At the moment, there are several of these on Ebay for quite high prices!
Bob
