Presenting the "Fartbottle" deluxe. - diyAudio
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Old 28th October 2004, 03:25 PM   #1
G is offline G  United States
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Default Presenting the "Fartbottle" deluxe.

Hi all. I finally couldn't stand using a SS preamp with my tube amp anymore so I took out some parts I had been saving for a special project and made a few orders from Michael Percy and created the "Fartbottle" (that is what someone on this site called the 12au7) deluxe. It is basically an overbuilt Foreplay and I can say that all of the people that have praised the sound of the circuit are not wrong. It sounds very balanced and nuetral and natural. I thought I would share some pics. :

http://img.photobucket.com/albums/v2...r/Image002.jpg

http://img.photobucket.com/albums/v2...r/Image003.jpg

http://img.photobucket.com/albums/v2...r/Image009.jpg

http://img.photobucket.com/albums/v2...r/Image008.jpg

Cheers.

G
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Old 28th October 2004, 04:47 PM   #2
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Default Nice photos

Dear Gavin,

Looks good, did a nice job. What material did you use for the chassis?
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Old 28th October 2004, 05:26 PM   #3
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Hi Steve! I used Hammond cast aluminum chassis for the pre and PSU.
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Old 28th October 2004, 08:32 PM   #4
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Nice use of the NL8's for interconnects, I use the same and they work great.
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Old 29th October 2004, 04:18 AM   #5
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Default Thanks

Thanks Gavin. The paint job looks pretty nice, what color is it?

Thanks.
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Old 29th October 2004, 05:06 AM   #6
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It is a custom color that I had mixed at a automotive specialty paint supply. Thanks.
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Old 29th October 2004, 05:13 AM   #7
karma is offline karma  Canada
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nice how manny hours did it take to build or days?

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Old 29th October 2004, 07:18 AM   #8
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Gavin,
How did you do the grounding arrangement?
Do yo have one starground in each chassis and connect them to each other by an extra wire in the umbillical?

Very nice job by the way!
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Old 29th October 2004, 06:12 PM   #9
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Nice, clean, beautiful

That "burnt copper" color rocks!
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Old 29th October 2004, 10:37 PM   #10
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Quote:
Originally posted by bequerel
Gavin,
How did you do the grounding arrangement?
Do yo have one starground in each chassis and connect them to each other by an extra wire in the umbillical?

Very nice job by the way!
Hi Bequerel.

I used two pieces of 3 conductor signal cable with a shield drain wire for the umbiblical. The black and the white of each piece was used for the negative conductor of the high voltage supply and the filtered DC filament supply respectively to give a very low resistance path back to the star ground point in the PSU chassis. The two Red wires were used for the B+ and the positive of the filament supply. The two drain wires were used as a chassis ground wire from the signal chassis to the star ground again providing a very low resistance path. I then grounded the PSU chassis and the signal chassis to earth at a star ground point. I floated the High voltage negative above earth using a 100 ohm resistor in parallel with a .22 uF cap between it and the star ground point. The preamp is as quiet as a church mouse. I also floated the filament supply about 50 volts above ground using a voltage divider. Thanks for the compliment.
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