a tube box on 9V
Posted: 28 Jul 2014, 06:47
this is a tube box my first make
DrNomis wrote:I agree Darkrain, 9V would mean that the cathodes of the valve aren't able to reach their full electron-emission capabilities, also, I seem to remember reading somewhere that if you run a valve at a lower heater voltage, it can lead to something called "Cathode Poisoning", incidentaly, I tried building a Valvecaster but it didn't work well and hummed alot.....
Well ... again why?! Standard voltage for heaters is: 6.3 or 12.6 so i choose 12.6 beacause:copachino wrote:DrNomis wrote:I agree Darkrain, 9V would mean that the cathodes of the valve aren't able to reach their full electron-emission capabilities, also, I seem to remember reading somewhere that if you run a valve at a lower heater voltage, it can lead to something called "Cathode Poisoning", incidentaly, I tried building a Valvecaster but it didn't work well and hummed alot.....
what about 18VDC??
copachino wrote:DrNomis wrote:I agree Darkrain, 9V would mean that the cathodes of the valve aren't able to reach their full electron-emission capabilities, also, I seem to remember reading somewhere that if you run a valve at a lower heater voltage, it can lead to something called "Cathode Poisoning", incidentaly, I tried building a Valvecaster but it didn't work well and hummed alot.....
what about 18VDC??
how much current would it be drawing? would an lm7812 be the ticket?DrNomis wrote:copachino wrote:DrNomis wrote:I agree Darkrain, 9V would mean that the cathodes of the valve aren't able to reach their full electron-emission capabilities, also, I seem to remember reading somewhere that if you run a valve at a lower heater voltage, it can lead to something called "Cathode Poisoning", incidentaly, I tried building a Valvecaster but it didn't work well and hummed alot.....
what about 18VDC??
18V DC will burn-out the valve heater, unless you put a resistor in that'll drop about 6V (which means alot of power dissipation in the form of heat), once the heater burns-out the valve is useless......
According to the DS it's 150mA per tube @ 12.6v that would be 18-12=6v dropout @ 150mA that would be 1W of power, a 7812 in a To220 package would be ok.rocklander wrote:how much current would it be drawing? would an lm7812 be the ticket?DrNomis wrote:copachino wrote:DrNomis wrote:I agree Darkrain, 9V would mean that the cathodes of the valve aren't able to reach their full electron-emission capabilities, also, I seem to remember reading somewhere that if you run a valve at a lower heater voltage, it can lead to something called "Cathode Poisoning", incidentaly, I tried building a Valvecaster but it didn't work well and hummed alot.....
what about 18VDC??
18V DC will burn-out the valve heater, unless you put a resistor in that'll drop about 6V (which means alot of power dissipation in the form of heat), once the heater burns-out the valve is useless......
It would be a beautiful pedal to look at.Dirk_Hendrik wrote:Looking forward to the 4 tube version!