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Old 13th April 2006, 09:46 PM   #1001
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hello Bas , yeah it s great , i like that
an original design , lol
i got ur transformer and choke thanks a lot
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Old 23rd April 2006, 06:36 PM   #1002
Giaime is offline Giaime  Italy
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I forgot to put here my Preamp...

Click the image to open in full size.
Click the image to open in full size.
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Please don't look at the volume knob I'm using... the real one is still in the building process

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and this is me...
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Old 25th April 2006, 07:27 AM   #1003
ddd is offline ddd  Bulgaria
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Nice! I like this style. One SE EL84 from me:
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Old 2nd May 2006, 12:49 AM   #1004
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Default Tube Linestage/Preamp

This is the first project I ever finished using tubes. I wanted to taste the various valves (because they are all so very different ;-) so I made a linestage with options. You can pick up a measurement of the DC heater suppy and adjust it on the rear of the unit. There is a discharge resistor and momentary switch so you can shut off the unit, discharge the caps and switch the valves without any clicking or popping and minimal risk to the tube. An advanced version may have the sockets entirley switched for non-tube swapping of instant comparison, where all flavours would be plugged into their appropriate sockets and selected via a large selector type rotary? I can't be bothered but a fun idea?



I hope you like it. It is a fun thing to have. Oh yeah, I think I'm going to add an octal socket when I rewire it.

Ja Bless,

Shawn.
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Old 2nd May 2006, 12:54 AM   #1005
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Default The schematic for Linestage/preamp

Here is the schematic.

It is by far the best sounding preamp I have ever owned, it's great 'cause I made it! It cost nothing, couple hundred bucks for everything.
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Old 2nd May 2006, 12:58 AM   #1006
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Default Inside

I have to sit down for a day or two and gut the thing and rewire it properly. I have some decent caps from Solen that just came in the post, soon.

Cheers,

Shawn.
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Old 2nd May 2006, 01:02 AM   #1007
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Default Exposed Electrolytics

Hey, one more thing. If you ever have to put an electrolytic on the top side of your "hot" looking chasis, why not strip the plastic off the elctrolytic capacitors, on most you will find "a more pleasing to the eye" aluminium barrel. Perhaps not for everyone.

Cheap and dirty works now just as much as it did back in the day.
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Old 2nd May 2006, 05:48 AM   #1008
ddd is offline ddd  Bulgaria
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I like your approach, Tom. Any observations?
But I doubt the Elcos could look better w/o thair motley sleeves.
It's a matter of taste anyway
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Old 2nd May 2006, 02:32 PM   #1009
Giaime is offline Giaime  Italy
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Quote:
Originally posted by ddd
But I doubt the Elcos could look better w/o thair motley sleeves.
I thought about this for my preamp a couple of posts up, but since I use a voltage doubler, the alluminium can carries 150V...

Hello Tomwaits, great preamp! Very good idea that of exchange tubes. But a little remark: I don't think that your totem configuration is best suited to put in evidence the differences. It's intrinsic degeneration tends to null out special tube "flavours": if you have to rewire it, why don't you try the classic grounded cathode -> DC coupling -> cathode follower (the same tube number as now). That will give you strong tube characterization: but I must admit that if I read right in the schematic, you're using one of my favourite dual triodes so...
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Old 2nd May 2006, 02:45 PM   #1010
poobah is offline poobah  United States
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Giaime,

You need to paint those capacitors. Of ALL people on earth... an ITALIAN (Ferrari, Michaelangelo, etc...) should know this.

Investigate "hammer tone" paints.

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