In Reply to: Re: Try a 12A4 posted by calico on March 26, 2007 at 18:41:19:
If you have poor sound quality from a 12B4
then the design must be really bad.
If it's dry sounding then current is too high
and if it's too warm it's too low current.
The 12B4 and 12A4 have GREAT sound quality!
Mine are choke loaded with ATC output.
If you open up your preamp and give me
the B+ and the cathode resistor value and
voltage across it I might be able to help.
You probably have a poor operating point.
You can post me direct for more info.
(Just click on danlaudionut above)
Who made it?DanL
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Follow Ups
- Re: Try a 12A4 - danlaudionut 18:58:41 03/26/07 (1)
- What current? - Salectric 10:37:32 03/27/07 (0)