In Reply to: Grainy Sound posted by eleiko2@verizon.net on June 25, 2012 at 05:23:03:
Try another amp.
As for me, the 405 uses dated 70s era LM301 op amps that are not known for the smoothest response. Hence, the 405-2 appeared later which used better TL072s and fixed the current limiting stage.
In '76, Frank Van Alstine offered an upgrade to the Dyna PAT-5 which replaced the lowly LM301s with far better LF356s. It was much better sounding.
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Follow Ups
- Process of elimination - E-Stat 21:57:13 06/25/12 (0)