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New Cavalli Audio Liquid Glass Amplifier - Fall Release - Page 10

post #136 of 644

Would it be possible to post the dimensions of the amp? Does it run hot? What is the good Dr.'s recommendation for a sufficient amount of clearance above the amp when positioned in a rack?


Edited by Dr. Roberts - 9/20/12 at 10:37am
post #137 of 644
Thread Starter 

Dr. Roberts, the dimensions are (including the front panel which is slightly wider than the body and including the feet):

 

13.75"W x 10.5"D x 4.5"H

 

The power dissipation depends on the tube used, but for most situations will be 55-60W. The output stages are biased at 150mA which leads to some power consumption.

 

The amp has lots of ventilation and does not get uncomfortably hot. I would say you need about 4" above the amp or really good slow airflow if you go smaller. This also assumes no restriction at the bottom or sides of the amp.

 

I've had the pre-production unit burning in tubes continuously for about a week now in a room with only convection cooling, no forced air, but on a table with nothing above the amp. The hottest part of the top panel, closest to the tube cage, is about 45C (about 113F).

Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #138 of 644

Anybody preordered yet? :D

post #139 of 644

I wish! I just spent $2k to get the squirrel's out of my attic!  Little buggers cost me a nice amp!

post #140 of 644
Thread Starter 

Yes, there are some sign ups. :)

Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #141 of 644
Thread Starter 

Gents, as we get closer to release of the product, here are just some of the tubes that should work in the LG:

 

Noval Tubes

 

12AU7

ECC82 

5963

6680

5814

12AT7

ECC81

6DJ8

ECC88

6922

E88CC

8416

6H30

6189

6N1P-EB

6H23-EB

7730

7316

ECC802

6CG7

12BH7

6FQ7

6GU7

 

Octal tubes

 

6SN7

12SN7

VT231

CV1986

CV1988

B65

B63

ECC32

CV181

 

There are three limitations on the tubes that can be used:

 

1. Has to match 12AU7 or 6SN7 basing arrangement.

2. Heater current less than or equal to 1A. For 6.3V tubes, they are in series so a 1A heater is ok. For 12.6V tubes they are in parallel so a maximum of 500mA heater current for 12V tubes per tube.

3. Maximum of about 22mA plate current per tube. Tubes like 6H30 MUST be run at the 200V Plate voltage setting because of this. But tubes like 6SN7 can run at 300V setting. 6922s and equivalents should be run at 200V because their plate voltage maximums are less than 150V.

 

Since the triodes are in a totem pole arrangement each triode sees 1/2 the plate voltage (either 100V or 150V).

 

There is a shutdown in the amp if too much plate current is being drawn.

 

Remember that the gain of the amp is 1/2 the mu of the triodes being used.

 

Hope this gets you started on your tube collections. :)

Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #142 of 644
Quote:
Originally Posted by longbowbbs View Post

I wish! I just spent $2k to get the squirrel's out of my attic!  Little buggers cost me a nice amp!

Oh man...we had the same problem the first winter after we moved into our house 11 years ago. Sorry dude!

post #143 of 644
Quote:
Originally Posted by MacedonianHero View Post

Oh man...we had the same problem the first winter after we moved into our house 11 years ago. Sorry dude!

 

The joy of living in the north woods...(Possibly snow tonight!)  Of Course, that is why a great amp is useful! Some indoor time is a comin'!

post #144 of 644
Quote:
Originally Posted by longbowbbs View Post

 

The joy of living in the north woods...(Possibly snow tonight!)  Of Course, that is why a great amp is useful! Some indoor time is a comin'!

Snow? Yikes, and I'm in the Great White North....no snow here for at least 2.5 months. But on that note, closing my pool tomorrow for the season. frown.gif

post #145 of 644
Thread Starter 

Sounds like you guys needs some tube-based room heaters. evil_smiley.gif

Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #146 of 644

Thanks for the info Doc. Already got me one of those room tube heaters....it's called a BAT power amp with Russian Mig valves.

post #147 of 644
Thread Starter 

LOL. Hard to compete with fighter jets. smile.gif

Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #148 of 644

Alex's next project. Liquid Fighterjet.

 

On that note, change your avatar, Alex. lol

 

Quote:
Originally Posted by runeight View Post

LOL. Hard to compete with fighter jets. smile.gif

post #149 of 644

Maybe he could use the logo inside of the two jet engines...

 

 

 

 

instead of seeing the fans you see two logos!    Liquid MiG....Supersonic Sound!

post #150 of 644

Liquid Oxygen.  Isn't that jet/rocket fuel?

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