Leaderboard

I finally built my Blue Hawaii - a single box KG 2015 which uses the mosfets, (but I will build the BJT boards too). All GR supplies. I was inspired by a Triumph Rocket motorcycle for the chrome trim and I wanted volume indication in the dark so it has a circle of leds and a delayed pointer off the heater warm up. While I was working all this out Kevin published the Grounded Grid so I am building one of those in a similar case. Looking forward to some extended listening now. Thanks Kevin for a great design

I was able to get the 450v supply up and running. I did have one error on the board. The current source feeding the 10v reference gets up to 150 degree F, but I can add more copper around it. I think it will be just fine. I was running this with a 110mA load.

Hmmm, I thought straight guys wrapped their "natural materials" in "plastic" all the time. Thanks! I was trying to make them look high end. Sonus Faber and Chario were my inspiration. Good thing Otis doesn't have much going on Saturday. We'll make 'em spiffy!

@Dusty Chalk - haujobb gave me some great F242 flashbacks. Industrial/EBM is a bit of a personal weakness.

Milo and I got the speaker boxes mostly complete today. Made some round holes and some rectangular panels. Tweeter holes are in the Cherry baffles only, as they're not deep enough to need holes in the MDF panel too. Woofer holes and port tube holes in back. Cherry baffles got milled and drilled as well. And the first coat of Arm-R-Seal. The fluting is strictly aesthetics.

That’s just so incredible. Awesome work Kerry.

Second day in Sydney, lovely city this is. We're very close to the Harbor....when we got here, we took a walk down to the harbor and looked through a nice local market at an area called the Rocks. Got some absolutely amazing licorice there, the maker is a fucking genius at bringing some of the most unexpected ingredients together to make a delicious treat. Then got a distant pic of the Opera House (we'll tour it later), but some big-ass thing was in the way. Today, we did a hop-on-hop-off tour of the city, stopped in a few places including Bondi Beach, Chinatown, several market areas, and then I walked back to the hotel while Karen is still shopping Lot of walking, but enjoying this a lot!

Seriously impressive Kerry (as usual )

Wow!

gorgeous Sent from my Pixel 2 XL using Tapatalk

Here's the HV version set to 450v. Have to test this one still.

Horses for courses. As John Broskie of TubeCAD points out, series regulators are well suited for class AB power amplifiers, where the current demand on the power supply can vary from tens of mA to several amps, whereas shunt regulators are best suited for class A amplifiers where the variation in current demand is relatively limited. Arguments about which “sounds better” approach religious discussions, although it is interesting that more designers claim that shunt regulators sound “better” than the reverse – for example, Broskie, the late Allen Wright of Vacuum State Electronics, Richard Marsh, the late John Camille, designer of the Kyrie 211 SET amplifier, Lynn Olson, designer of the Amity, Raven and Karna, Kevin Carter of K&K Audio, and Frank Cooter. I think Kevin Gilmore is one of the few designers who has gone on record saying that series regulators are as good or better. Incidentally, Richard Marsh wrote an excellent basic article on power supplies for Audio Amateur magazine (1983, issue 3). Religious arguments aside, there are pluses and minuses to both approaches. In favor of series regulators, they can have excellent specifications in terms of noise, output impedance, input rejection, etc. For example, the low voltage regulators designed by Walt Jung have a lower output impedance than 0.2” (yes, one fifth of an inch) of 18 gauge wire. Of course, to achieve that performance you would have to incorporate the regulator circuit on the amplifier board, as any intermediate wiring would negatively affect the impedance. Series regulators are frequently more efficient than shunt regulators as they only require a few mA extra current draw for regulation. In favor of shunt regulators, they have a constant current draw from the raw power supply, can both source and sink current, and have a relatively simple path to ground. By using a constant current source in series between the raw power supply and the shunt, this limits the signal currents to the regulator and amplifier area, whereas the varying demands of a series regulator means that some simplified form of the signal current has to circulate between the raw power supply and the series regulator. The argument that a shunt regulator can both source and sink current is thought by some to be a major reason for its sonic superiority. However, this can be abrogated to a significant degree by placing a bleed resistor after a series regulator to bring it up to 50% of maximum load, as first suggested by Richard Marsh. This allows a series regulator to also source or sink current up to the level of its bleed current, but also decreases the efficiency advantage of a series regulator. For a phono preamp, which runs in class A, you definitely want low noise. The GRLV definitely qualifies for that. K&K Audio sells a shunt regulator kit which it claims is suitable for phono preamps, and says it is based on the Salas regulator, so I assume that it is low noise also, though without suitable measuring equipment it is impossible to know how they rank in terms of noise.

https://haujobb.bandcamp.com/album/alive Industrial -- unless the genre still interests you, stay away

This amazing.

Milo has another type of woodworking to do.