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Old 4th May 2006, 03:47 AM   #1031
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Quote:
Originally posted by moamps
Hi Shawn:
The one next to the mains connector is for ground lifting.

When and why do you lift the ground?
What ground are you lifting from what kind of ground?
Perhaps a schematic would answer these silly questions?

Ja Bless,

Shawn.
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Old 4th May 2006, 10:29 AM   #1032
moamps is offline moamps  Croatia
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The questions are not at all silly.

Ground lifting refers to separating the safety ground (to which the chassis is connected) from the power ground of the amp. The ground lifting switch comes in useful to minimize or avoid altogether any ground loop problems typically associated with audio systems.

I'll try to get the schematic up over the weekend. I suspect a few pics of the inside of the amp might be welcome as well.

Regards,
Milan
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Old 6th May 2006, 09:23 PM   #1033
moamps is offline moamps  Croatia
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Shawn,

The schematic is up at http://www.moxtone.com/siemox.htm

Regards,
Milan
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Old 13th May 2006, 07:19 AM   #1034
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Hi Miklos,

Quote:
Originally posted by miklos
Headphone amp with Russian ECL84 video tube. The output pentode section is in a cathode follower configuration.
Miklos
Very nice! I also used ECL84 (actually PCL84) for a somewhat larger PP headphone amp. It is able to drive small bookshelf speakers, too.

Tom
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Old 14th May 2006, 08:12 PM   #1035
gianis is offline gianis  Greece
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Default line pre

my new pre- ampl. 12sx7 with VFD input display
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Old 14th May 2006, 08:30 PM   #1036
gianis is offline gianis  Greece
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Default 801 tube preampl.

and a pic from my latest preampl. with 801 tube [poor foto from my mobile cam]
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Old 18th May 2006, 08:25 AM   #1037
ddd is offline ddd  Bulgaria
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Congratulations, gianis! Elaborated work.
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Old 18th May 2006, 06:40 PM   #1038
gianis is offline gianis  Greece
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Default preamplifiers

Thanks!
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Old 18th May 2006, 11:20 PM   #1039
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Default Re: 801 tube preampl.

Quote:
Originally posted by gianis
and a pic from my latest preampl. with 801 tube [poor foto from my mobile cam]

You're all lit up like a Christmas Tree, brilliant! True art! Do you have more photos, like building it and putting it together. How do you like it? Shawn.
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Old 19th May 2006, 08:19 AM   #1040
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Default My tube gear

Here are some pics of my S-5 Electronics tube amplifier and a Millett Hybrid Headphone/pre amp. I recently cased up the amplifier in a photo box that I got from a crafts store.

The amplifier has the input caps removed and acts as a power amp. The pre amp has a diamond buffer, Noble 100k pot, and Blackgate caps on the output.

Click the image to open in full size. Click the image to open in full size. Click the image to open in full size. Click the image to open in full size.
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