A new project, Blue Velvet Pre Amp is ready and rocks ! ! ! - diyAudio
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Old 11th December 2006, 07:20 AM   #1
aroS3 is offline aroS3  Greece
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Default A new project, Blue Velvet Pre Amp is ready and rocks ! ! !

On Saturday evening i finished the Blue Velvet pre Amp project designed by thingy
Olsher.

It uses one 6SN7GT - VT231 (NOS KEN-RAD ~ year 1940)per channel, tube rectification by 6X5 (NOS JAN year 1945) and finally tube regulation by VR105. The original schematic uses 5AR4 rect and OA2 for regulation.
The performance is outstanding and together with the Simple EL84PP the system just rocks ! ! !
The sound is extremely balanced and very tranparent also harmonics and sound image are superb.
A tube pre amp to live for.
Some finshing details remaining to complete the total image.
The coupling caps i used in this project are Mundorf Supreme Silver oil and even the run in time are a few hours they seem to be excellent while the resistors are Famus Kiwame form Japan.
As a result i'm very pleased from the total performance while the VR105 with the marvelus blue - purple light are eye candy.
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Old 11th December 2006, 07:24 AM   #2
aroS3 is offline aroS3  Greece
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Another one....
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Old 11th December 2006, 11:35 PM   #3
Klimon is offline Klimon  Belgium
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Looking very nice

Enjoy the thingy

Simon
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Old 12th December 2006, 06:02 PM   #4
Sherman is offline Sherman  United States
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Looks nice. What do you estimate the gain is? IIRC the Simple EL84 doesn't require a preamp. Did you make changes to the power amp?
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Old 12th December 2006, 10:23 PM   #5
aroS3 is offline aroS3  Greece
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The gain is around 12 db.
Although according to papers the Simple EL84 doesn't need a pre amp to reach max power, I noticed that working together with the pre amp, the total system has more guts now and someone could say that it's not any long a 10 Watts amp but some more......
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Old 13th December 2006, 06:49 AM   #6
aroS3 is offline aroS3  Greece
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A pic from underneath.....
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