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aroS3 11th December 2006 07:20 AM

A new project, Blue Velvet Pre Amp is ready and rocks ! ! !
2 Attachment(s)
On Saturday evening i finished the Blue Velvet pre Amp project designed by thingy

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.

aroS3 11th December 2006 07:24 AM

2 Attachment(s)
Another one....

Klimon 11th December 2006 11:35 PM

Looking very nice ;)

Enjoy the thingy


Sherman 12th December 2006 06:02 PM

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?

aroS3 12th December 2006 10:23 PM

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......

aroS3 13th December 2006 06:49 AM

2 Attachment(s)
A pic from underneath.....

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