Discussion in 'Audio Hardware' started by PJC68, Apr 26, 2021.
Can you give a brief description of the sound you got with the brimar CV4003
These are the ones i got, a hell of a lot cheaper here in the UK
CV4003 12AU7WA BRIMAR NOS VALVE/TUBE (T14B) - Langrex
I have a number of RCA not all exactly the same. All of them are NOS though.
Very very similar to the Mullards not only in sound but in construction. Nice top, very holographic, but you lose a little bass maybe accuracy compared to the RCA. But has more bass and accuracy when compared to JJ, Syvaniaand a few others. For me they are the best compromise in my Rogue Perseus Preamp.
I should add, with these expensive NOS tubes.. the JJ modern tubes really weren’t too bad. They didn’t have the definition, detail or holographic soundstage, but they did have nice bass and were absolutely the quietest of all the tubes.
Thanks for that info
So i suppose im almost getting a mullard cv4003 for a lot less money, the NOS Mullard cv4003 (non cyro) are £100 each
I can say they are similar.
Brimar boxplates have more air and top-end extension than Mullard, a nice amount of warmth and tight bass. More detail and clarity in the mids than the Mullard.
@PJC68 , you mentioned Radiotechnique earlier. They were a French factory owned by Philips and have the same tooling as Amperex and Philips, Holland. Basically, they sound like a Bugle Boy or a Philips Mini Watt.
That’s good news, they will be going in the amp in a couple of weeks
I heard the 1965 RT sounds similar to a bugle boy, but the 1956 RT sounds better
I knew Phillips owned RT, Millard, Valvo and Amprex
aparently the miniwatt sound close to the Bugle boys
I am surprised no one has mentioned Psvane 12au7-s (Art series).
I find them better than NOS Brimars, those I find are overhyped, especially after I got Psvane Art run in and fully singing. Brimars are a bit grainiy and harsh (higher mids particularly), less depth and dynamics in the bottom has a clear sonic advantage for my ears at least. Psvane has silkyness, vibrancy and "3D" in stage (I run Primaluna Dialogue Premium HP with GL KT88s)
The real downside on Psvane 12au7-s is the burn-in time, they need at least 50 hours, but in my example around 100 hours they are ready for full duty.
New production Art series Psvanes don't cost a fortune like some NOS 12au7s do, so I'd highly recommend to try them.
Two Brimars exist- short and long plate. The short plate are just a whisper of the long plate performance.
Proper Brimar long plates on mine. Don't get me wrong, they are not bad at all, just per exorbitant price they go around these days - they are overhyped IMHO. I prefer Psvanes and they only cost a fraction of those.
Great advice. Thanks.
This is true. The premium Amperex PQ and Philips SQ are so much smoother at the top-end with powerful bass. But they're pricey.
I have decided to put the Brimar cv4003 in the amp tomorrow and let them cook
I have heard good things about the pvsanes and then someone else say they suck, looks like it is not a "one size fits all" senario
I like the sound to be balanced hence me taking the mullards out, the imaging is solid and sounds holographic though
I know, i have seen some of the prices of the amprex tubes, you probably could not give them away 40+ years ago
Anyone tried the phillips miniwatt (holland harleen plant)
Yes, I like them. Revealing, lush midrange, wide and deep soundstage. But, like the Bugle Boys, they have an extended top-end which is slightly unrefined.
Thanks for that
I have been offered 2 mullard (Holland) ECC82,s but unsure, i might just put the Brimar CV4003 in and have done with it
Never heard Mullard from the Holland factory. I suppose they have Amperex tooling.
That's the PITA part of tube rolling, the different branding by parent companies and the subcontracting which was widespread.
It’s chaotic, you can get exactly the same valve with a different name on for less
I put the brimar cv4003 in today, the sound is smooth with more treble and bass, I only listened for the first hour so will give them another listen tomorrow, they are cooking as we speak
Hope the sound gets better, the Millard imaging was a little more solid and holographic, but I think I’m going to like the brimars more
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