14-07-2017, 11:52 AM
Andy, it is always a good idea to pay particular attention to the grounding in any amplifier. One single ground to chassis at the input with everything else connected to a suitable bus-bar - e.g.: 16 swg tinned copper - avoids all those nasty circulating currents that provide the unwanted feed back.
Take a look at the widely available construction details for the Mullard 5-10 and 5-20 amplifiers for good examples of this technique. For example: http://www.r-type.org/articles/art-003d.htm
Vox used the same technique in their valve guitar amplifiers like the AC30.
Take a look at the widely available construction details for the Mullard 5-10 and 5-20 amplifiers for good examples of this technique. For example: http://www.r-type.org/articles/art-003d.htm
Vox used the same technique in their valve guitar amplifiers like the AC30.
