10.05.2017, 14:33
Hello Kai,
I just ordered a replacement Marquardt switch from Allied electronics. The selected tape speed doesn't change the pitch of the noise, the only thing that effects it is the duration of the time between on and off. If you turn it on and then off and quickly back on the noise is considerably reduced. If you wait several hours after turning off then the noise will be considerably louder when turned back on. For this reason I have been looking at capacitors, something storing and discharging some part of the circuitry connected with channel II.
Cheers, Ken
I just ordered a replacement Marquardt switch from Allied electronics. The selected tape speed doesn't change the pitch of the noise, the only thing that effects it is the duration of the time between on and off. If you turn it on and then off and quickly back on the noise is considerably reduced. If you wait several hours after turning off then the noise will be considerably louder when turned back on. For this reason I have been looking at capacitors, something storing and discharging some part of the circuitry connected with channel II.
Cheers, Ken