Wow, edisonwu, does all that dust help give it that trademark lush sound?
What tubes are those? it looks like the output tubes are the Siemens CCa in your signature, and the driver tube is the 1959 Genalex Gold lion? How do they differ from the Telefunkens?
The one in the middle is a 1960 Genalex Gold Lion B739 with D getter and Mullard date codes. In my limited experience it's one the very best Mullard ECC81 ever. The pair in side is Philips 1956 CCa Pinched Waist (Branded Valvo) which is the world's first E88CC to my knowledge. Siemens CCa slanted D getter (Branded Valvo) has shorter body, and the glass of the tube has not been pinched at about the point of the upper mica. Here is a close look of the Siemens CCa.