1 NTN66 4 months ago I love Valcos. Many early versions had the Rola oval speakers. No re-cone kits exist and there is nothing the same size (some close, but not exact). Additionally, those ovals are 4 ohms. With two, the Output Transformer is 2 ohm, plus it is riveted to one of the speaker frames in my 1957 6161 amp.That's where the forum came in. Forum member Powdog recommended to me that I could use an output transformer from a 5E3 Deluxe since it is pretty close and is 8 ohm, making available speakers much more plentiful.I removed the baffle with the ovals and the output transformer, made a baffle for the 12" speaker, attached the output transformer .... and my amp was sounding better than ever!