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Old 6th April 2012, 10:58 PM   #31
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Quote:
Originally Posted by dantwomey View Post
After.....a few hours.....I realized I was running out of power.

My wife said the very same thing to me last night in the boudoir..... Should I be concerned, or can I just consider this to be a function of my advanced age???? Ta-da-boom....!

On a different note, I'd recommend you give the F5 a little more time to "mellow in". I know mine took a good 15-25 hours before I fully enjoyed its nuances.
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Old 7th April 2012, 01:18 AM   #32
alazira is offline alazira  United States
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Quote:
Originally Posted by dantwomey View Post
This is the circuit I built. I didn't realize I could eliminate R7 and R8. I didn't measure voltage drop across R3 and R4. I just made sure the Vdrop across R11 and R12 was 600mV and DC offset on the output was near zero.

Regards,
Dan

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R5 & R7 are paralleled so they are equal to a single 50 ohm resistor. If using a single resistor, use 5W. A single 100 ohm resistor as in the schematic Peter Daniel shows would reduce feedback/increase gain and have a little warmer sound (probably the opposite of what you want if you are looking for a shinier top end)
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Old 7th April 2012, 01:22 AM   #33
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Originally Posted by CanAm Man View Post
My wife said the very same thing to me last night in the boudoir..... Should I be concerned, or can I just consider this to be a function of my advanced age???? Ta-da-boom....!

On a different note, I'd recommend you give the F5 a little more time to "mellow in". I know mine took a good 15-25 hours before I fully enjoyed its nuances.
I'll leave running for a couple of days at low volume to see if that helps. At the very least it'll warm up my basement.

Regards,
Dan
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Old 7th April 2012, 10:48 AM   #34
AndrewT is offline AndrewT  Scotland
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Originally Posted by alazira View Post
R5 & R7 are paralleled so they are equal to a single 50 ohm resistor. If using a single resistor, use 5W.
removing one of the paralleled 100r does not require the remaining 100r to be of higher dissipation.
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Old 7th April 2012, 02:44 PM   #35
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Pictures as requested. The first pic is of my DIY heaven. The Shigaclone on top of Pedja Rogic's DIY AYA III DAC. My compromise to hometheater is my Anthem D2 Preamp/Processor above my recently fired up F5. As mentioned in an earlier post this system feeds my DIY line arrays designed by Rick Craig of Selah Audio.

Click the image to open in full size.

Pics of my F5 with some cosmetic stuff still to be done.
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Click the image to open in full size.

Click the image to open in full size.

Regards,
Dan
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Old 7th April 2012, 02:51 PM   #36
6L6 is offline 6L6  United States
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Wow! Looks nice!

Are the heatsinks cool enough? I am only curious because the fins are the 'wrong' way for convection, and their efficiency is reduced. Such is the way with found parts and pieces...
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Old 7th April 2012, 03:07 PM   #37
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Originally Posted by 6L6 View Post
Wow! Looks nice!

Are the heatsinks cool enough? I am only curious because the fins are the 'wrong' way for convection, and their efficiency is reduced. Such is the way with found parts and pieces...
Define 'cool enough'?

Regards,
Dan
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Old 7th April 2012, 03:10 PM   #38
AndrewT is offline AndrewT  Scotland
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cool enough that they look good
or
cool enough that they enhance the reliability of the amplifier?
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Old 7th April 2012, 03:10 PM   #39
6L6 is offline 6L6  United States
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Hold your hand on them for 5+ seconds?
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Old 7th April 2012, 03:10 PM   #40
Jozua is offline Jozua  South Africa
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Dan

I think you are placing your very expensive speakers at risk with such a low power amp!

Regards

Jozua
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