The Most Audiophool Thing You Own

[SIY]

What were you testing for? That is interesting. 6DJ8s, a vhf tube can be tricky. The best I have are bugle boys that were tested for noise and microphonics some 50 years ago by ARS in Calif.

Linearity, noise, noise corner, grid current.

 

[watchnerd]

We've a fair bit of overlap.

Check out jpjones3's music collection on Discogs

Dig through jpjones3's collection on the world's biggest online music database and marketplace & start cataloging your own. Happy Collecting!

www.discogs.com

That's freaky.

But you've got some classical on LP, which I relegate to RTR and digital.

 

[watchnerd]

Linearity, noise, noise corner, grid current.

I have to admit.

I still can't figure out what the heck mu is

 

[SIY]

I have to admit.

I still can't figure out what the heck mu is

Generally, maximum voltage gain, grid to plate. dVp/dVg at constant plate current.

 

[xaviescacs]

I have a dynavoice speaker cable thick as a garden hose. I'm not sure what is more embarrassing: seeing it every day or trying to sell it to someone.

 

[watchnerd]

Generally, maximum voltage gain, grid to plate. dVp/dVg at constant plate current.

And is there a reason they didn't call that just 'gain'?

 

[SIY]

And is there a reason they didn't call that just 'gain'?

It’s related but not the same. It’s the gain only under a constant current condition. If you have a load on the plate, the gain will be lower than mu.

 

[SIY]

Here’s an example: suppose you have a tube with a mu of 50, a plate resistance at the operating point of 10k, a plate load of 30k, and an unbypassed cathode resistor of 500 ohms. Gain will be mu times 30/(30 + 10 + (0.500*30)) = 27.3. Not the same as mu.

 

[JP]

That's freaky.

But you've got some classical on LP, which I relegate to RTR and digital.

Mistakes of the young. Most of my classical is digital download so no entry in Discogs.

 

[Robin L]

My copy of "Pièces De Luth Du Vieux Gaultier" as performed by Hopkinson Smith, Astree 8703, with green marker on the rim. I used to have sorts of Audiophool crap, but his pretty much is the last example of my previously wayward ways:

 

[phoenixdogfan]

Woo headphone stand. Sez "Woo" right in the name for cryin' out loud.

Audio Advisor, Inc.

 

[pseudoid]

I still can't figure out what the heck mu is

What is Mu-metal?
Mu-metal is a nickel-iron alloy with very high magnetic permeability that has a low coercivity that saturates at low magnetic fields, resulting in excellent shielding properties. Magnetic shielding works by redirecting the propagation of magnetic field lines so that magnetic flux flows through the walls of the shield itself, by-passing the inside of the vacuum chamber.
Chemical Composition:
MuMETAL® Chemical Composition % In Weight*
Nickel (Ni) 80-82%
Molybdenum (Mo) 3.5-6%
Manganese (Mn) 0.8% max
Silicon (Si) 0.5% max
Cobalt 0.5% max
Copper 0.30% max
Chromium 0.30% max
Phosphorus 0.02% max
Sulfur 0.01% max
Carbon (C) 0.05% max
Iron (Fe) Balance
From <http://www.mu-metal.com/technical-data.html>
Then, there is that other 'mu' or the greek letter μ, which represents one millionth, or 1e−6.

 

[watchnerd]

What is Mu-metal?
Mu-metal is a nickel-iron alloy with very high magnetic permeability that has a low coercivity that saturates at low magnetic fields, resulting in excellent shielding properties. Magnetic shielding works by redirecting the propagation of magnetic field lines so that magnetic flux flows through the walls of the shield itself, by-passing the inside of the vacuum chamber.
Chemical Composition:
MuMETAL® Chemical Composition % In Weight*
Nickel (Ni) 80-82%
Molybdenum (Mo) 3.5-6%
Manganese (Mn) 0.8% max
Silicon (Si) 0.5% max
Cobalt 0.5% max
Copper 0.30% max
Chromium 0.30% max
Phosphorus 0.02% max
Sulfur 0.01% max
Carbon (C) 0.05% max
Iron (Fe) Balance
From <http://www.mu-metal.com/technical-data.html>
Then, there is that other 'mu' or the greek letter μ, which represents one millionth, or 1e−6.

None of those

 

[monkeyboy]

DT1990 and T1.2 :-(

 

[2ndHarm]

Isn't Nagra reviving their line?

They seem to be solidly digital these days. Although, they have a number of refurbished and new, old stock analog units they'd be happy to sell you. $20,000 and up.

 

[watchnerd]

Although, they have a number of refurbished and new, old stock analog units they'd be happy to sell you. $20,000 and up.

That's not bad, actually.

 

[rdenney]

I own a green Sharpie, but have never used it.

Lessee…does a medical-grade isolation transformer count?

I own some obsolete playback media and equipment, but that isn’t phoolery without intent.

Rick “maybe the damping platform under my turntable?” Denney

 

[MattHooper]

... I then added to the phoolery by spending about $400-500 rolling tubes FWIW, I currently run Amperex 'PQ' USA white label 6922's.

Ha! I have a foot in that "audiofoolery" as I've been tube rolling recently. Actually quite enjoying the (apparent) results. (E.g switching from 6550s on my CJ amps to KT120s, fer the heck of it).

Aside from that, the most audiofool think I own is the Uptone Audio Iso Regen. I bought it quite a long time ago...can't even remember exactly why...but never actually used it. After the ASR review I realized I still had it around and sold it. (Brand new in the box). Except the buyer returned the damned thing because he said it didn't work! So perhaps I got a bum unit. I can't even bring myself to bother testing it in my system.

 

[pseudoid]

None of those

P'haps this one:
The MU (Musicians' Union) looks after music recording and broadcasting rights when you do any recording work – from regular sessions to home recording. From <https://musiciansunion.org.uk/recording-and-broadcasting>

 

[Kuma]

A $150 Moon Audio USB cable. Purchased it right before I found ASR.