According to Tim, the expert in vintage tubes, the GEC U52 (or the GEC version of 5U4) is not the 100% identical or same as normal 5U4G. It only draws 2.25A of filamanet current instead of 3A and it went easier on the power supply. The WE274B tubes draw about 2A of filamanet meaning that the U52 will be a closer substitutes then the other 5U4G which draw 3A. There are a few version of the U52 with the black based being earlier then the brown based.
As such, I went out this afternoon to source for another set of the early black based U52 as spares. Even though it was costly, I have decided to bite the bullet and acquired the black based U52 set as these black based version are so rare and difficult to get. In addition, the prices in ebay is same or higher then getting it from the shop in Hong Kong. One seller in ebay is asking for 140 UK pounds per set...
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