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4S Universal Tube Preamp Project (12A*7)
http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=4628
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Author:  gonzalo guerrero [ 29 Mar 2019, 04:06 ]
Post subject:  Re: 4S Universal Tube Preamp Project (12A*7)

mwhouston wrote:
gonzalo guerrero wrote:
i'm bulding a 4s preamp,but here i only have linear 250k pots,can i use it? or will degrade the sound?
thanks to all. :evil:

No fine.

yeah!!! thanks!!! the 4s is alive,loud'n'proud...i'm using solid state power suply,and dc in filaments,was lost on the grouns wirings,and pickup a little hum,but now is all ok,nice sound! the best sonics to me,12au7 and 12bh7.
:lildevil:

Author:  ILoveHiFi [ 29 Mar 2019, 06:03 ]
Post subject:  Re: 4S Universal Tube Preamp Project (12A*7)

gonzalo guerrero wrote:
i'm bulding a 4s preamp,but here i only have linear 250k pots,can i use it? or will degrade the sound?
thanks to all. :evil:

Linear pots means its hard to get accurate and tight volume control, this means its harder to get the volume to your desired volume.
Log pots have the curve where you turn say 10% and volume increases 10% as hearing is logarmitic.

Linear then turn 10% maybe increase 5% or 15% volume or even worse

Author:  gonzalo guerrero [ 29 Mar 2019, 06:10 ]
Post subject:  Re: 4S Universal Tube Preamp Project (12A*7)

ILoveHiFi wrote:
gonzalo guerrero wrote:
i'm bulding a 4s preamp,but here i only have linear 250k pots,can i use it? or will degrade the sound?
thanks to all. :evil:

Linear pots means its hard to get accurate and tight volume control, this means its harder to get the volume to your desired volume.
Log pots have the curve where you turn say 10% and volume increases 10% as hearing is logarmitic.

Linear then turn 10% maybe increase 5% or 15% volume or even worse

I`m using the 4s pots in max full signal and controling the level in the power amp...

Author:  gonzalo guerrero [ 03 Apr 2019, 23:56 ]
Post subject:  Re: 4S Universal Tube Preamp Project (12A*7)

hello...just change the pots to log,and add a led status...he's more happy now... :D :lildevil:
the sound with a miniwwat 12au7 and the oddblock with sovtek kt88,and the NGF of,is a very beauty sound...
thanks to all.

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