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Old 23rd December 2012, 03:39 PM   #11
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Now, would I be evil if I said The Invasion Of The Double Digits ?
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Old 23rd December 2012, 10:57 PM   #12
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Quote:
Originally Posted by Tesla88 View Post
Thanks but what about Do It with Tubes?
I assume this is for recording studio use? If so, the parts selection and construction technique are pretty demanding, if you are up to the task, you can check out Gyraf's DIY projects: Gyraf Audio - G9 DIY.

And if your friend just want something "tubey" to fool around with at home, there are many soundcards with tube preamps built-in for decent prices. Not trying to talk you out of the project, but just a reminder that there is a huge difference in requirement for pro vs amateur use...

Jaz
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Old 23rd December 2012, 11:42 PM   #13
Tesla88 is offline Tesla88  Italy
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My friend is a studio engineer with an SSL analog mizer, i built some stuff for this studio like a pair of 1176 compressors , a cabinet simulator for guitar , DI boxes , etc
So he's not a fool who likes having nice looking preamp with a tube lighted by some blue leds

Really don't know what he wants this time , he gave me some vocal tracks for test saying try to give some warm and color...

I started from a single stage form 6CG7 with a 47k load on the plate and a trimpot from K to Ground to obtain a well balanced distortion , only tested with sinewave.

I read carefully all of you stated , please go on with suggestions , i really appreciate!

And sorry for my bad english...
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Old 24th December 2012, 02:53 AM   #14
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Quote:
Originally Posted by Tesla88 View Post
My friend is a studio engineer with an SSL analog mizer, i built some stuff for this studio like a pair of 1176 compressors , a cabinet simulator for guitar , DI boxes , etc
So he's not a fool who likes having nice looking preamp with a tube lighted by some blue leds

Really don't know what he wants this time , he gave me some vocal tracks for test saying try to give some warm and color...

I started from a single stage form 6CG7 with a 47k load on the plate and a trimpot from K to Ground to obtain a well balanced distortion , only tested with sinewave.

I read carefully all of you stated , please go on with suggestions , i really appreciate!

And sorry for my bad english...
Since your friend is a real pro, please take a look at the Gyraf's site for more information, even if you don't end up using their design, you can still get some ideas for your build, good luck with your project, keep us posted on how it turns out.

Jaz
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Old 24th December 2012, 08:36 AM   #15
Tesla88 is offline Tesla88  Italy
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I looked at the gyraf , intresting stuff

Quote:
good luck with your project, keep us posted on how it turns out.
Sure , i hope to do something in these days , but i'm goig to build a pair of 1176 compressor again these days . must be ready for january

Anyway once they're finished i'll try to do something on this project.

Please keep posting intresting ideas/schematic

Have a nice day a merry xmas
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Old 24th December 2012, 11:19 AM   #16
DF96 is offline DF96  England
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Buy a cheap Chinese tube buffer off ebay. They add lots of 'tube sound', by using low supply rail voltage etc.
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Old 24th December 2012, 03:09 PM   #17
TheGimp is online now TheGimp  United States
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Pick a tube of your choice that is known for good neutral sound capability. Build a clean buffer stage with a cathode follower to give good drive ability. Now add a coupling cap (.22uF 450V) to a 50K pot and an additional 5K resistor to ground from the anode of the first stage. As you decrease the resistive load on the anode, second harmonic distortion will go up.

For instance, I'm testing a 6CB6 (Triode strapped) with a current source load and fully bypassed cathode. At 200V on the anode, and 1.5mA through the tube I get second harmonic less than -80dB (0.078% thd) and third below -90dB. Not fantastic, but a good gain stage.

If I add a 2.2uF cap in series with a 10K resistor to ground, the second harmonic goes to -32dB and third only increases to about -72dB.

Voila! Tube sound. 3.6% second harmonic THD.

The downside is as one increases the anode load to increase second harmonic distortion, one also increased the load on the stage and gain decreases. Thus, you need a gain control between stages to allow you to compensate for the decreased gain as you increase distortion.
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