The EC88 is a European designation for the 6DJ8/6922/E188CC/7308 family, and is a dual triode. The Holy Grail of the family being the Siemens CCa. The WY4P is a chinese voltage regulator tube like the RCA OD3 (http://cgi.ebay.com/NOS-0d3-VR150-JAN-RCA-MADE-IN-USA-TUBES-OD3_W0QQitemZ330230807107QQcmdZViewItem) Change yours for an RCA, and you should realize quite a sonic improvement. There is a 5Z4/5Z4P full wave rectifier tube, but I've never heard of a 15Z4P.
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