My pair of JJ Matsushita 5AR4 supplying my SSHV's have developed a mechanical buzz after around 1000 hrs. The SSV is set for 60 mA each channel, the power transformers are hammonds 269JX, the transformers are not buzzing or hot.
I've had good luck with JJ's in the past but, I think I am going to source a pair of japanese 5AR4's.
Sound lke the right decision?
I've had good luck with JJ's in the past but, I think I am going to source a pair of japanese 5AR4's.
Sound lke the right decision?
My original post has a typo, these are just plain JJ new 5ar4's withh 1k hours on them. The datasheet from JJ claim 60 uf, but I can certainly try lower.
http://lib.store.yahoo.net/lib/thetubestore/JJ-GZ34-S.pdf
http://lib.store.yahoo.net/lib/thetubestore/JJ-GZ34-S.pdf
As Philips owned both Mullard and Amperex, I'd say this data sheet is reasonably definitive. It shows a max. I/P cap. value of 60 μF.
Unfortunately, JJ has come to stand for "Jamona Junk", far too often. The OP's experience may be 1 more example of the phenomenon.
As the fact that Matsushita made their 5AR4s with Mullard tooling is quite well known, those tubes carry hefty price tags. I suggest you contact a reliable tube vendor, like Jim McShane and purchase a properly culled Chinese or Russian specimen.
Unfortunately, JJ has come to stand for "Jamona Junk", far too often. The OP's experience may be 1 more example of the phenomenon.
As the fact that Matsushita made their 5AR4s with Mullard tooling is quite well known, those tubes carry hefty price tags. I suggest you contact a reliable tube vendor, like Jim McShane and purchase a properly culled Chinese or Russian specimen.
It depends on the SS diode in question. A 1200 PIV/5 A. silicon carbide Schottky by Cree costs 8 USD.
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