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Has anyone with a VAC Renaissance 70/70 or 30/30 tried a 300b XLS? I'm curious to hear any outcomes others have had with this tube in the VAC. From looking at specs on paper, it seems like an ideal match, as the VAC likes the filaments at 1.5a and the plate voltage runs at 450V, which is really the limit for a standard 300b.
I owned a Ren 30/30 MkIII for a couple of years. I tried tube substitutions, pretty good ones too. WE 300Bs, various excellent 40s-50s NOS 6SN7s. It was a mistake. One of the very special qualities of the 30/30 was the endless hours Kevin (& the other Kevin) spent voicing the model before they released it to production. All the great tubes just threw the sound out of balance. I even sent it in to VAC (for the next upgrade) and K&K tried their best but it never sounded as "right" as it did with those original stock tubes.
I've tube-rolled most everything else I've ownedl. I would certainly try different tubes in many of the tube amps I see offered today that I doubt the mftr has spent very long voicing. But I would only use a factory tube set on a VAC 30/30.
Yes I agree the stock set of tubes do strike a nice synergy. Tube rolling the VAC has been the most time-consuming and difficult to get "right." For example, I could never get the amp to sound right with ANY non-stock 6SN7 combo when stock 300B's are used.
Major overhaul in all the tubes, and to very specific combo's are necessary. If opportunity arises, do try this combo: National Union Grey glass 6SN7--> KenRad VT231--> AVVT 32B. Took me literally years to get this combo worked out; even then, Herbie tube dampers on 6SN7's and very specific set of cabling, power cords were mandatory. In this configuration, I honestly do not know what more an amplifier can be asked to do :)
I have the 70/70 MKIII and love it!.....if you do go with other 300Bs other than those supplied from VAC, just ensure they can run with 37-38W at the anode and approxiamately 430-440V. If you do try those other 300Bs I would like to know what you think.
Steve, are you asking about Emission Labs 300B-XLS? I wanted to make sure the 1.5A filament current was OK for my 30/30, so I e-mailed Kevin @ VAC a couple weeks ago but didn't get a response.
yeh, that's the one i want to try. look at vac's site, at the manual for the 70/70, it says that the 300b tube should be comfortable running at 1.5a.... so from the manual, it appears that the 300b xls would be ideal
Aha! My 30/30 manual doesn't state that and Kevin had previously told me to stick to the WE standard which is 1.3A, but I figured there just had to be some leeway there. Thanks!
Weird, the manual says stick with the Western Electric standard, which is 1.5a... weird or what? i think there are mistakes in some of the VAC manuals. the renaissance pre tube complement outlined in the manual is wrong i think...
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