a tube box on 9V

Stompboxes circuits published in magazines, books or on DIY electronics websites.
kaya112
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Post by kaya112 »

this is a tube box my first make
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Post by kaya112 »

PCB :P :P :P :P :P

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rocklander
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Post by rocklander »

what is it, and what does it do?
got schematic?
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Post by Dirk_Hendrik »

Big boot waiting for encounter!!
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Post by kaya112 »

schematic

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Post by DarkRain »

Just a quick question: You are using 9v to supply tube heaters? It's a little bit under the specified voltage (12.6 between pin 4 and 5) - you could use 12v to supply the whole pedal and get more headroom and also you will be within the specs for the heaters.

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Post by DrNomis »

Looks like the schematic is based on the Valvecaster....... :hmmm:
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Post by Dirk_Hendrik »

Below what we call a building drawing.
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The Schematic looks like this:
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Note the differences. The building diagram is handy for building the thing, even if you do not know what it does. The schematic is to understand what is going on.




(Thanks Simon, Valvecaster confirmed)
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Post by DarkRain »

Ok ... but again... wouldn't be more convenient to use a 12V supply then a 9V? ?


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Post by Dirk_Hendrik »

Most definitely.
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Post by DrNomis »

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..... :thumbsup
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Post by copachino »

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..... :thumbsup

what about 18VDC??

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Post by DarkRain »

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..... :thumbsup

what about 18VDC??
:) Well ... again why?! Standard voltage for heaters is: 6.3 or 12.6 so i choose 12.6 beacause:
1 i can supply the heaters with the same PSU
2 it's better the 6.3 in terms of voltage

Why to drop 3 volts or 5v on a resistor ... (@300 or 150mA it can get hot) when... you don't have to drop anything and use 12V as supply ...

Best regards,
Gabriel Tudoran

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Post by DrNomis »

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..... :thumbsup

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...... :thumbsup
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Post by rocklander »

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..... :thumbsup

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...... :thumbsup
how much current would it be drawing? would an lm7812 be the ticket?
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Post by DarkRain »

rocklander wrote:
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..... :thumbsup

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...... :thumbsup
how much current would it be drawing? would an lm7812 be the ticket?
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.

Best regards,
Gabriel Tudoran

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Post by kaya112 »

two tube box PCB
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Post by Dirk_Hendrik »

Looking forward to the 4 tube version!
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Post by atreidesheir »

Dirk_Hendrik wrote:Looking forward to the 4 tube version!
It would be a beautiful pedal to look at.
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