August 7th, 2015, 4:07 pm
[/quote]FerdinandII wrote:I don't think the Plinius does have a volume control......
Roscoe
August 7th, 2015, 5:32 pm
August 10th, 2015, 8:40 am
August 10th, 2015, 9:19 am
dberning wrote:It is my understanding that you live near me. It appears that your composite desired load for your preamp would be about 4 k ohms. The 2.2 uF output capacitor I see in your photos is too small to drive this load with full bass response. At a minimum, I would suggest 10 uF. As to whether your output stage can deliver enough current to drive the output linearly at the required voltage depends on the idle current through the tube and the configuration as to basic compliance. Adding extra output jacks is straightforward mechanical, but determining linearity of output drive requires expertise and suitable test equipment. Since you apparently live near me, I would be happy to evaluate what you have and a logical path to get you to where you want to go.
David Berning
August 10th, 2015, 9:48 am
August 10th, 2015, 10:10 am
August 10th, 2015, 10:25 am
dberning wrote:Stuart's idea is good in principle, but caution is in order. It appears that there is a muting relay for the output with perhaps a timer that allows the voltages to stabilize in the preamp before allowing the output to be active. Without muting, there is a risk of destroying ss amps and speakers as the output voltage wanders around during warm up. If you do something like Stuart is suggesting, you probably would need a second relay for the additional outputs.
David
August 10th, 2015, 11:52 am
August 11th, 2015, 2:16 pm
August 12th, 2015, 11:02 am