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2nd Annual San Diego Head-Fi Meet: Saturday, November 2nd, 2013 - Page 8  

post #106 of 178
That thing looks awesome, how much did parts cost roughly for you?
post #107 of 178

Thank you! I have a ton of electronic parts here in my inventory, so I didn't have to buy much. The mini 48-to-12 VDC switching regulator was the most expensive item I actually bought ($15), and I guess the vintage Philips NOS tube would set one back $25 or so, but again...I have tons of them lying around.

 

If one were to try and reproduce this from all-purchased parts, my guess would be ~ $100 - $125, not including the table lamp needed for the base.

 

It's not the parts cost, it is the extraordinary amount of design time and assembly labor that is most significant.

 

Cheers,

-Papi Chulo

post #108 of 178
Quote:
Originally Posted by Diogenio View Post
 

I'm here in San Diego and will try my best to make it. If so, will bring along my "Teta" HP amp (Spanish, look it up). It is a 12AU7 with 48 VDC B+ running in constant-current mode, driving a power MOSFET output buffer. Surface-mount stepped attenuator as vol control. Hand wired, point-to-point. The chassis is a heavy, chromed steel base from an old IKEA table lamp. I designed this a few years ago and built two, the other one (the prototype) was a birthday gift to my buddy. We both find it drives our Sennheiser 650s like we've never heard before. Of course, I'm a bit biased...

 

Cheers,

Papi Chulo

 

 

Love that boob amp!

post #109 of 178

The "Boob-Tube" or  "Tube-Boob."  I like either one.

post #110 of 178
Quote:
Originally Posted by Diogenio View Post
 

I'm here in San Diego and will try my best to make it. If so, will bring along my "Teta" HP amp (Spanish, look it up). It is a 12AU7 with 48 VDC B+ running in constant-current mode, driving a power MOSFET output buffer. Surface-mount stepped attenuator as vol control. Hand wired, point-to-point. The chassis is a heavy, chromed steel base from an old IKEA table lamp. I designed this a few years ago and built two, the other one (the prototype) was a birthday gift to my buddy. We both find it drives our Sennheiser 650s like we've never heard before. Of course, I'm a bit biased...

 

Cheers,

Is it unusual to run the 12AU7 at 48 volts? I've usually heard of lower than that, but maybe it was the plate voltage I'm thinking of.

 

Mike

post #111 of 178

The filament is always run at 12 V. I am referring to the plate voltage @ 48 VDC. Yes, it is a bit unusual - but the highest DC voltage I would want anywhere close to my ears. Small signal triodes of this type are designed to typically operate between 200 - 300 V on the plate. It just so happens that there is a "sweet spot" in the toe of the plate curves at 48 V that is very linear and musical. Lower voltages are not as good, neither are higher ones until one reaches the 200 - 300 V recommended range. This has been my experience, and the experience of other designers as well.

 

My circuit has been further linearized through the use of constant-current loading of the tube. The output buffers are pure Class A and run 150 mA of idle current. They are practically stout enough to drive a high-efficiency loudspeaker!

 

Bottom line is that everybody smiles when they listen to it. It was a satisfying project.

 

-Papi Chulo

post #112 of 178

Just an FYI I've added a Liquid Glass to my amp setups and will have it with some nice 6GU7 tubes...

post #113 of 178

What is a "liquid glass?"

post #114 of 178
Quote:
Originally Posted by Diogenio View Post
 

What is a "liquid glass?"

 

http://www.cavalliaudio.com/index.php?p=product_details&pId=1 - Excellent amp and paired wonderfully with the MD. I could just imagine how it would pair with the AD...

post #115 of 178
Quote:
Originally Posted by Greed View Post
 

 

http://www.cavalliaudio.com/index.php?p=product_details&pId=1 - Excellent amp and paired wonderfully with the MD. I could just imagine how it would pair with the AD...

I can't wait!!! I love living in San Diego :] just a 20 minute journey to the Coronado library and I can also visit my old high school friends at the same time

post #116 of 178
Wish I could make this....I'll be in Las Vegas that weekend.
post #117 of 178

New member, longtime can-head. This is my RSVP, really looking forward to it!

post #118 of 178
Quote:
Originally Posted by Diogenio View Post
 

What is a "liquid glass?"


Technically, all normal glass is liquid. :p

post #119 of 178

I hope to attend as well, pending if I can leave early from my 8-year old son's buddy's bday party.  I'd be bringing my Centrance iDevice M8, as I want to hear how they power the Alpha Dogs.

 

Any of you San Diego Head-fi peeps know of / are a good DIY'er that can solder Ultimate Ears IEM 2-pin connectors onto my custom cable?  Please PM if you know of any local leads, much appreciated! 

post #120 of 178

Would really like to encourage everyone to bring their portable stacks if possible as I will only have an AK120 there for people wishing to listen to demos.

 

Looking forward to the meet!

 

 

 

 

Brannan Mason

Here at Noble, we craft some of the finest universal and custom in-ear monitors available today. 

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Head-Fi.org › Forums › Meets, Get-Togethers, Factory Tours › Local / Regional Head-Fi Meets, Parties, Get-Togethers › 2nd Annual San Diego Head-Fi Meet: Saturday, November 2nd, 2013