Tweet
Hello and thanks for any input /advice.
The tube data sheet for the ECLL800 shown here http://frank.pocnet.net/short/001/e/ECLL800.gif shows 26ma for the two pentodes and 16ma for the shared screen. What are these values of, desirable bias, maximum bias, absolute maximum values over the range of an amplifiers performance?
There are no data sheets that include the graphs for working out bias etc. So I sort of ball parked an amp together, this has served me well for 2 years. I have gone back inside to take measurements as I was hoping to get more power as it is quieter than my 5 watt marshall,
With tubes in I have 290v HT, I have a cathode resistor 360ohm that shows 10v across it =28ma total
It states max power for each pentode is 6w, so if I was aiming for 70% bias then (6/290)x0.7=14.5ma per pentode, so is it biased cold. What do i change to get it nearer the 70% bias? DO i lower or raise the cathode resistor?
Thanks.
The tube data sheet for the ECLL800 shown here http://frank.pocnet.net/short/001/e/ECLL800.gif shows 26ma for the two pentodes and 16ma for the shared screen. What are these values of, desirable bias, maximum bias, absolute maximum values over the range of an amplifiers performance?
There are no data sheets that include the graphs for working out bias etc. So I sort of ball parked an amp together, this has served me well for 2 years. I have gone back inside to take measurements as I was hoping to get more power as it is quieter than my 5 watt marshall,
With tubes in I have 290v HT, I have a cathode resistor 360ohm that shows 10v across it =28ma total
It states max power for each pentode is 6w, so if I was aiming for 70% bias then (6/290)x0.7=14.5ma per pentode, so is it biased cold. What do i change to get it nearer the 70% bias? DO i lower or raise the cathode resistor?
Thanks.