This past month, while what began as a simple minor mechanical fix to the Power and Standby Switches on a Hiwatt Little Rig head, they decided a 0.1uF film cap was necessary in series with the input grid of the 1st tube stage of their amp. I did notice from their photos they had mistakenly eliminated the 1M Grid Bias resistor to those tubes, so they corrected that, but still insisting that that cap is necessary. Strange.
I've not seen this needed before, and don't find it on any of the conventional Tube Amps we all work on. Claimed to prevent what tiny DC potential there is at the grid from going back to the guitar. The Volume control that follows this tube stage, in their 1/2W Output setting, you can hear the volume control making noise. This was their 'fix'. Oh well......that's what was requested.
I've not seen this needed before, and don't find it on any of the conventional Tube Amps we all work on. Claimed to prevent what tiny DC potential there is at the grid from going back to the guitar. The Volume control that follows this tube stage, in their 1/2W Output setting, you can hear the volume control making noise. This was their 'fix'. Oh well......that's what was requested.
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