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I just rolled the tubes on my Jolida JD-100 to some NOS GE JAN 12AX7WA's (1975). Wow, right out of the box, much deeper soundstage, warmer sound, think these might be keepers. They are grey plates and not sure about the Mica. Just thought other JD-100 owners might be interested.
Follow Ups:
Have you tried the Black gates everybody seems to be nuts about? Any comparison, or is this the first experiment you've done? Do you have the modded Jolida w/ Svetlana tubes, or just the stock Chinese tubes?Thanks for the post! I've yet to start paying off my hoped-for Jolida, but I'm very excited to hear it...
I have not swapped any tubes in mine, but di try two small experiments to see just what the effect would be.
* first one was a set of soft rubber pads under the feet just to see what the effect would be. The upper mids may have been just a touch more detailed, but on the other hand didn't like the effect it had on the upper bass. One thing it did was to make the soundstage a little deeper, and somewhat wider. But the total effect was nothing to write home about.
* The secound attempt was a set of home brew roller blocks. Now this was dramtic! I normally listen to my Soliloquys from about nine feet away. Love the detailed sound, but hate the lack of bass (5.0's). Still with my listening being mostly of acoustic by nature I can get by 80% of the time. But getting back to the roller blocks; they seemed to trow the sound stage out in front by what seems tobe about four to five feet! Width seems unchanged, and have not made up my mind as to ifthe stage was any deeper. The highs seem tobe just a hint brighter than the rubber pads, and the bass seems to be a little tighter. I can recommend this to all of you.
Now where will I go from here? Well it's a new "redisgned" set of roller blocks, and a set of cones seating in a flat plate ontop an "O-Ring." The plates will be solid copper, and the cones will be a 303 stainless alloy with a built in hight adjustment. And while this is all going on I have a new matched pair of GE 5751 black plate tubes
waiting for some action.
glt
See my challenge over in Tweaker's Asylum...I'm looking for something along these lines...
Hi,
Not much to them so I'll describe them from top to bottom. I made the top from a piece of 7075 T-6 aluminium with a hole bored thru the middle. In the hole I put a hardened steel liner (thinking it was 1/2" I.D.). The outside was an 1 1/4" and about 5/8th tall. The bottom half was similar, but larger in diameter at 1 3/4". These two blocks are seperated with a hardened ball bearing (3/4" if I remember correctly). I have not, but do plan on trying an o ring under the bottom puck. Have no idea if a larger ball, or smaller liner would have made a difference in the sound. All I know is that it threw it so far forward that we had to actually change our listening position.
glt
After reading the posts you all have once again peaked my curiosity.
So I've started another set of roller blocks that are made somewhat different. The bodies are made of brass, and are set up to use either a flanged steel sleeve or an oilite bronze bearing as a seat for the ball. The sleeve has a 5/16 hole in it with a slight radius ontop.
The top will be in two configurations. The first will be similar to the bottom, and the secound will be set up for a ground tooling ball that has a built in post with a shoulder. The ball diameter will be 1/2", but I will be able to change to larger or smaller balls at will
(also meterial they made of)I plan on trying hard rubber, ceramic, soft steel and hard steel as well as carbide. And then there is a third set of clocks in the works that will use a layered "puck" as well as the balls.
gary
Started with chinese stock tubes, pretty fair, then tried Sovtek 12ax7lps-much better bass, very foreward, maybe a little too much top end on some recordings. Overall I liked them. The GE's seemed to improve the top end and soundstage depth. Have not tried the blackplates-there seems to be a seller's market on them and the price is getting out of control.
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