Posted by PakProtector [ 205.188.116.67 ] on January 11, 2006 at 10:40:19:

hey-Hey!!!,
The schematic for the PP 2A3 amp is done. Galahad is its name. It employs a Schmitt inverter front end pair of 12BY7 pentodes with neutralizing caps for the 2A3 finals.

The 10k load gives a -3dB point of ~23 kHz w/o neutralization. With the caps in place to eliminate the effects of Miller on the grid-anode capacitance, it should run to the limits of the output Iron.

To ensure Class A operation, I suggest the uprated 2A3's from Russia. They will also make a little bit more power. This amp ought to do 7W quite well.
cheers,
Douglas

• http://www.audioroundtable.com/GroupBuild/Projects/Galahad_Schematic.pdf

Replies:

• Re: PP 2A3 intro - Wayne Parham 11:55:17 01/11/06 (9)
  • Re: PP 2A3 intro - manualblock 14:40:38 01/11/06 (8)
    • More - PakProtector 15:49:39 01/11/06 (7)
      • Looks Great ! - MRCLASSICMAN 11:15:58 01/12/06 (0)
      • Re: More - Damir 10:26:43 01/12/06 (5)
        • Re: More - PakProtector 11:13:28 01/12/06 (4)
          • Re: More - Damir 12:17:52 01/13/06 (3)
            • More front end tubes - PakProtector 19:40:33 01/13/06 (1)
              • and further fun... - PakProtector 11:00:18 01/16/06 (0)
            • front end gain - PakProtector 16:30:42 01/13/06 (0)