Just wondering if the new production 12DW7 such as the EH are equivalent to the old 7247 with respect to hum and microphonics resistance.
FWIW, JJ's 12DW7 gets good "press".
Are you overhauling an already existing piece of equipment? In a new build, contain your costs with 'X7s and something else, say a 12BH7. Share bottles between channels.
Are you overhauling an already existing piece of equipment? In a new build, contain your costs with 'X7s and something else, say a 12BH7. Share bottles between channels.
+1
The 12DW7 is half a 12AX7 and half a 12AU7 in one envelope. It's also stupid expensive compared to 12A*7...
The 12DW7 is half a 12AX7 and half a 12AU7 in one envelope. It's also stupid expensive compared to 12A*7...
The sense I got from data sheets was that the originals were somewhat of an upgrade over the A_7s in noise and microphonics. If so I was curious as to whether the current production were also.
Ya I was talking NOS... I should have said. Still, a Shuguang 12AX7 is about 10 bucks. JJ 12DW7 are going for about $25 at the local shop, and NOS are $42... 6N2P are still only like $2 🙂 Funny enough, the only place I have a use for 12DW7 (or 12AX7/12AU7 is for voltage regulation in a phono amp. I don't use those for audio at all!
In my part of the globe the prices of ECC832 and ECC83S (JJ) is
approximate equal. And that is brand new tubes with warranty.
I never got that idea. AFAIK it was just one X and one U gut in the same bottle, for chassis where you need half an X and a half a U.
Like "meatloaf mix": half ground beef, half ground pork, from the regular bins, pre-paired for your convenience.
Oh... the 7xxx series were supposedly "industrial", which may imply Premium, but AFAIK these were mostly regular-run parts with a little more inspection.
OTOH, the 7025, whose specs equal those of the 12AX7, is quite another Version, though, with dedicated low hum, bifilarly wound heaters. Hence it equals the European ECC83.
Best regards!
Best regards!
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