When I turn my preamp off when the amp is still on my right rear PT 88 has a slight blue glow to it for a second could that be the bias resistor if so what is the value of the Bias resistor
3 posters
VTA ST120 kt88
peterh- Posts : 1823
Join date : 2012-12-25
Location : gothenburg, sweden
- Post n°2
Re: VTA ST120 kt88
It's nothing wrong with the vta120, it's a procedural error !rfbro wrote:When I turn my preamp off when the amp is still on my right rear PT 88 has a slight blue glow to it for a second could that be the bias resistor if so what is the value of the Bias resistor
The vta120 will get a surge when the pre is turned off. This might be damaging to the tubes and should be avoided.
Better turn the vta120 off first , then after a few seconds the pre.
At power on, turn the pre on first, and after a while ( 30s ?) turn the vta120 on.
deepee99- Posts : 2244
Join date : 2012-05-23
Location : Wallace, Idaho
- Post n°3
Re: VTA ST120 kt88
peterh wrote:It's nothing wrong with the vta120, it's a procedural error !rfbro wrote:When I turn my preamp off when the amp is still on my right rear PT 88 has a slight blue glow to it for a second could that be the bias resistor if so what is the value of the Bias resistor
The vta120 will get a surge when the pre is turned off. This might be damaging to the tubes and should be avoided.
Better turn the vta120 off first , then after a few seconds the pre.
At power on, turn the pre on first, and after a while ( 30s ?) turn the vta120 on.
Yeah. What Peterh said.
deepee99- Posts : 2244
Join date : 2012-05-23
Location : Wallace, Idaho
- Post n°4
Re: VTA ST120 kt88
Oops, posted the following twice
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