I've had my Yggy on for about 12hrs with music or tv going through it non-stop. Last night it was barely warm only on one side and this morning it's slightly warm everywhere.
My question is does it only get notoriously hot 3 days in?
I've had my Yggy on for about 12hrs with music or tv going through it non-stop. Last night it was barely warm only on one side and this morning it's slightly warm everywhere.
My question is does it only get notoriously hot 3 days in?
In that interview Jason was talking about the new Vidar amplifier. The Vidar has high-density heat sinks, but instead of being on the outside of the chassis, they surround what Jason is calling a "heat tunnel" in the middle of the chassis. The tunnel is hollow like the center of a donut, and the heat is radiated mostly through that tunnel. The casing of the Vidar's at RMAF were also pretty warm to the touch at RMAF, and Jason indicated that they should have had more clearance than the shelf space provided at RMAF.
In that interview Jason was talking about the new Vidar amplifier. The Vidar has high-density heat sinks, but instead of being on the outside of the chassis, they surround what Jason is calling a "heat tunnel" in the middle of the chassis. The tunnel is hollow like the center of a donut, and the heat is radiated mostly through that tunnel. The casing of the Vidar's at RMAF were also pretty warm to the touch at RMAF, and Jason indicated that they should have had more clearance than the shelf space provided at RMAF.
I enjoyed meeting and talking with Jason at RMAF. The downside to going is that I now have an in-person inkling of how good this Schiit is, and that makes the waiting so much more difficult! First world problem.
Yep, I'm actually in the office and in the middle of the detailed torture-testing of Vidar. And yes, it does have heat sinks--high density versions, arranged in the middle of the chassis. You can literally look all the way through the center of the amp.
So far, I can report that Vidar is comfortably exceeding its power ratings in all modes, and into all rated loads. It is also (now) 100% stable. The ones at the show had some parasitic oscillation into 4 ohm loads near maximum output, which has been addressed with some changes to the compensation and bypassing.*
Next is thermal testing. We're getting aluminum bottom chassis to test next to the current steel design, so we can have a bit more surface area to spread the heat.
For heatsink nerds, the Vidar has about 620 square inches of radiating area in the heatsinks themselves, plus about 155 square inches for the top, plus about 280 square inches for the bottom chassis.
For history nerds, this is a bit more radiating area than the Sumo Polaris 2 had back in 1990, which was rated at 120/240 into 8 and 4 ohms. (Vidar, in current form, puts out more power than Polaris 2—and has three pairs of output devices, rather than two, so it's a significantly more robust amp. And...Polaris 2 cost $799. In 1991.)
*Running into stuff like this is normal in power amp design...it's a whole different ballgame than small-signal or low-power design. I'll have a chapter up on this soon.
Yep, I'm actually in the office and in the middle of the detailed torture-testing of Vidar. And yes, it does have heat sinks--high density versions, arranged in the middle of the chassis. You can literally look all the way through the center of the amp.
So far, I can report that Vidar is comfortably exceeding its power ratings in all modes, and into all rated loads. It is also (now) 100% stable. The ones at the show had some parasitic oscillation into 4 ohm loads near maximum output, which has been addressed with some changes to the compensation and bypassing.*
Next is thermal testing. We're getting aluminum bottom chassis to test next to the current steel design, so we can have a bit more surface area to spread the heat.
For heatsink nerds, the Vidar has about 620 square inches of radiating area in the heatsinks themselves, plus about 155 square inches for the top, plus about 280 square inches for the bottom chassis.
For history nerds, this is a bit more radiating area than the Sumo Polaris 2 had back in 1990, which was rated at 120/240 into 8 and 4 ohms. (Vidar, in current form, puts out more power than Polaris 2—and has three pairs of output devices, rather than two, so it's a significantly more robust amp. And...Polaris 2 cost $799. In 1991.)
*Running into stuff like this is normal in power amp design...it's a whole different ballgame than small-signal or low-power design. I'll have a chapter up on this soon.
So far, I can report that Vidar is comfortably exceeding its power ratings in all modes, and into all rated loads. It is also (now) 100% stable. The ones at the show had some parasitic oscillation into 4 ohm loads near maximum output, which has been addressed with some changes to the compensation and bypassing.*
Quick question, what does increasing the output devices do for the sound quality? Less distortion? Less noise? Or does it just prevent the Amp from breaking down as opposed to improving the sound quality In which case doing something like using 6 pairs or 10 pairs of output devices would only increase the cost and add nothing of value?
Also out of curiosity, how many Multibit DAC chips would you have to use per channel (I know you use 2 now) in order to have enough current/voltage summed up to send the output directly to an amp without a separate analog section...be it opamp based or discrete?
I've had my Yggy on for about 12hrs with music or tv going through it non-stop. Last night it was barely warm only on one side and this morning it's slightly warm everywhere.
My question is does it only get notoriously hot 3 days in?
Originally Posted by Jason Stoddard /img/forum/go_quote.gif
For heatsink nerds, the Vidar has about 620 square inches of radiating area in the heatsinks themselves, plus about 155 square inches for the top, plus about 280 square inches for the bottom chassis.
Ignoring the chassis, you've got quite a bit of capacity just in the fins. I'm out on the road now but once I get back from this trip, I might have to napkin math the P,diss and guesstimate what kind of action the sinks are seeing. Assuming a stright-fin arrangement it would be interesting to see the gains on some pin-fin arrangements. Not that it needs to be done (and maybe you have already!), I'm just studying for the PE and this would make a cool natural convection problem
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