Leaderboard

Had lunch with Grawk at Champy's in Chattanooga Great time catching up before he went off to a bacon festival he didn't invite me to Sent from my ONEPLUS A3000 using Tapatalk

I might need to fire my photographer, but here's something new.

Stairs went in easy yesterday. Solid as a rock. Not sure these beams holding up our front porch had to be replaced, but we did it anyway.

I deny being there

He knew that bacon would just lead you to having a biscuit. The world can't take that right now.

Have a phenomenal day young man!

Finally got out to test the new brakes. Not your typical mid-April ride, with a light dusting of snow on the trails and temps in the low 30s... The brakes did squeal once on the trail which I'm hoping was an aberration or I'm going to be grumpy. They worked great though, and should improve with a few more rides.

It’s not about the loud volume in itself, it’s the process of getting to a loud master, by adding lots of gain, compression and limiting, that can cause audible distortion. https://en.m.wikipedia.org/wiki/Loudness_war Anyway, I’ll have a listen tonight to your link and report how my gear behaves...

Lost in Space -- I really like reboots like this. I approve. Oh, and hey, look, it's Parker Posey. And Molly Parker (whom I know from Deadwood and House of Cards).

So, there are a couple possibilities. The first is that you have reached the limits of the amp, and the second is that you've reached the limits of the headphones. If it is the second, then there is no solution to the problem other than changing to different headphones. If it is the first, it depends on whether you are hearing distortion due to the amp running out of voltage, or current. The KGSSHV uses +/-450 volt or +/-500 volt power supplies, so its voltage limits are higher than the BHSE (which uses +/-400 volt PS), and close to or the same as the DIY T2 - in fact, there is less than 1 dB difference between the max voltage output of the KGSSHV with 450 volt PS and the DIY T2. The alternative is that you are hearing distortion due to current limiting, which could be alleviated by increasing the standing current in the KGSSHV. However, a more important point is, that if you are listening regularly at "deafening volumes", you are likely irreparably damaging your hearing. One sign of this is that if you hear ringing in your ears after a listening session, that is, as someone colorfully put it, "the scream of a dying acoustic nerve." You can replace headphones and amplifiers. You cannot replace your ears. Once your hearing is gone, it is gone.

Looks great! Thanks for the recipe. I've recently wanted to make some Moroccan dishes and bought cumin and other spices in preparation. This looks like a great dish to start on.

Harissa is so delicious. I've only ever used the premade stuff -- thanks for the recipe.

https://www.google.com/amp/s/www.sfchronicle.com/recipes/amp/Repertoire-recipe-Harissa-and-Honey-Chicken-12813045.php

flyback switcher on board. another stepdown flyback switcher for the filaments

I quick test on my system with BHSE and 007mk2.9 says this is a problem with a component in your chain. With hard diving edm/pop at volumes that made me cringe I experience no distortion. Fwiw I ride motorcycles all the time and my wife thinks I'm deaf. My normal listening volume is determined by her yelling across the house at me. Ymmv.

The Copenhagen is a differential cascode circuit. The Copenhagen V uses tubes (valves) for the upper device, while the Copenhagen S uses transistors (sand). They are otherwise just about the same. It does indeed use input and output transformers (amorphous Lundahls in both cases, though the inputs can use mu metal instead). The tubes (E81L's) need not be matched at all. It is what is often called a "transconductance amp". In essence, it uses the headphone's impedance as an I/V converter, and it takes advantage of the slight Sennheiser impedance bump to make it a bit more euphonic. When used with Senns, I'd describe the sound as happy and punchy (kind of making them sound like how Grados would sound if they were not grating) - some people hate it, others love it, but it definitely has a sound. It can be linearized with the addition of some parallel resistance on the output (this is what a triode amp does except the parallel load is the tube plate impedance). Without doing that, it is not great with the Focals. Even with, they are so poorly damped that it would not be my first choice for powering them. With phones that have a flat impedance, it is pretty neutral. It's not an amp for everyone (definitely not for the objectivist crowd), but it is my favorite these days - I use a Copenhagen S with 650's for most pleasure listening.

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.

^ Here and ready for action Sir!

Dinner is served

About to: (Sous vided) Rack of pork

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

Smoked Panko and herb crusted Rack of Lamb. Sent from my iPhone using Tapatalk

They are that, but they are available. DSHA3 and DSHA3F (specifically for Focals, picture below in walnut) are the current models, and Tom and I are very close to releasing the T5 which is effectively a DSHA output stage with tube gain. Indeed, I just received an updated T5 power transformer in the mail today that I soldered in not 10 minutes ago.

Sent from my ONEPLUS A3000 using Tapatalk