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In Reply to: RE: tubes that interchange with the CV378? posted by immatthewj on July 28, 2020 at 11:37:32
As I said, the 5U4G/GB should be tube to use. I have tried every rectifier that could be remotely mistaken for the recommended one, and the 5U4G/GB were always better. I guess that means you don't want my NOS CV378 at a bargain price. ;)
It should be easy enough to find NOS or near-NOS 5U4G/GB out in the world, and those would be the way to go. I have not found current production to be on par with the genuine articles. If you run into trouble finding a rectifier, I have quite a few of those things...
Another topic, I settled onto RCA VT229 for the driver tube. As with the rectifier position, I have scoured the world for 6SL7 types, and most were pretty good, and I even came up with a few alternatives with unusual sonic presentations which had some appeal, but in the end the wartime RCA VT229 are the best all-rounders.
I am not including in that ranking the only 6SL7-type tube that has bettered the RCA in that driver position because it is legendary, exceptionally rare, and sells for ridiculous prices if you can find them. I refer here to the ECC35, which are old Euro-origin tubes. I think that the Mullards are the ones that people are usually looking for, but I don't know the whole story on those. Don't buy one without clear ECC35 labelling: I had a very reputable dealer try to sell me a pair of Sylvania 6SL7 which he claimed were the ECC35. Fortunately I had the exact tubes, with preserved labelling, to prove my case. My point: be careful if you go this way.
Wow, thanks, Valva!
I didn't do a whole lot of tube rolling on my Little Cary before I put her in mothballs & upgraded to a pair of ARCs. I did pop a few rectifier tubes, & this being my first real decent piece of audio gear (not to mention being my first tube amp) I always called Cary Audio & asked them to sell me new ones.
As I typed earlier in this post, I had some brand new 5U4s in my spare tube box (they've been there for well over 20 years), so someone must have told me they were a good sub. They are branded as being Phillips. It looks like The Little Cary may be what I am listening to for a while, so I do want to have some backups. I have found a slew of reissued 5U4s, but I'll look for some NOS to use & keep the Phillips for back ups.
As far as input drivers, when I brought the Little Cary out of mothballs, one channel was significantly muted, after a bunch of completely stupid troubleshooting, I found that it was following the 6SL7s. I actually had a couple of more pairs of those in my box of spares, & one of the pairs was even worse than the first set. BUT, in ancient looking boxes, I found a couple of "RCAs" & I don't know how good or bad they are, but at least both channels broadcast a relatively equal level with them.
So, long story short, yes, I will need a pair of drivers also, & I'll heed your tube rolling experience with this amp & start looking for VT229s.
. . . and I see that Upscale audio has some RCAs & Sylvania.
Any thoughts on those?
Those RCAs are the one. I will sell you a pair of those for about one-half of what one of those goes for at Upscale Audio. I simply have too many of these: they last forever.
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