What is the AC voltage for the heater AC input?
Try to keep the resistors on 2.2R so you help the regulator. I suggest to select LT1085 for regulator and not the LM338.
The multiturn 200R trimpot is standard value and easy to find. 220R is not standard and you cannot find it, but the value here is not critical.
Replace R11 1K with 560R so you can adjust the voltage to 6.3V
So:
1) mount 2.2R resistor
2) mount LT1085
3) mount R11 560R
4) mount 200R trimpot
Do not connect the I/V board with tubes at this stage because if voltage is around 7volts you may destroy the tube.
So load the power supply with three 1.2R 5W resistor in series so you load the power supply like having the tubes connected.
Now adjust the voltage to 6.3V
If relay chattering then replace 2.2R with lower value.
When everything ok do some power cycles and check if relay engages ok. If you have the scope check the ripple on output. You must load as I told you before you check.
After all this you can connect the I/V board (of course you need to adjust the High voltage side to 270V)
I hope it helps.
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I think i will use 9V since you said it's ok....
You mean load at the heater and B+ section at the output with 3 resistors to adjust the trimpot....????
An externally hosted image should be here but it was not working when we last tested it.
If the voltage slightly exceed to 270v+/-30v after adjusting the R1, R2 & R3 value would this be a no no...???
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I was the one who asked. IMHA it's a waste of part... Just put it to high.
voltage wise, and heater wise the specs are pretty much the same.
However, the 6n6p has a completely different pinout, so you will need to either.... air wire your sockets, or cut traces and reroute using wire to the socket.
An externally hosted image should be here but it was not working when we last tested it.
the pinouts couldnt be much more different... frustratingly.
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here is the css load which i'll try soon.
Its a casocode dn2540n5 (upper) and dn2535n3 lower.
I'll adjust the Rset (trimmer) to allow 30ma, so 15ma through each triode. wether the reg will work at this increased load we shall soon find out.
An externally hosted image should be here but it was not working when we last tested it.
Its a casocode dn2540n5 (upper) and dn2535n3 lower.
I'll adjust the Rset (trimmer) to allow 30ma, so 15ma through each triode. wether the reg will work at this increased load we shall soon find out.
1. Strosek: full set
2. boudy : full set
3. ksnider1: full set
4. toufu : (IV + Supply For IV) x 2
5. ferrari: (IV + Supply For IV) x 2
6. analogdiy: full set
7. wobii: full set
8. Cobra2: (IV + Supply For IV) x 2
9. mikelm: full set
Hi all! the next weed i will finis all PCB for 9-15 member !
2. boudy : full set
3. ksnider1: full set
4. toufu : (IV + Supply For IV) x 2
5. ferrari: (IV + Supply For IV) x 2
6. analogdiy: full set
7. wobii: full set
8. Cobra2: (IV + Supply For IV) x 2
9. mikelm: full set
Hi all! the next weed i will finis all PCB for 9-15 member !
My mistake...perhaps this is the right way to load the heater to adjust the voltage to 6.3V....3 resistors in series....please correct me if i'm wrong...
An externally hosted image should be here but it was not working when we last tested it.
Yes, I replaced R11 with 680r and R8/R9 with 1r. Then there where no problem adjusting to 6.3V...
I haven't still managed to get full voltage from the HV section. I have followed the steps suggested in this thread and got aprox. 260V. As soon as possible I will try and fiddle some more with it.
1. Strosek: full set
2. boudy : full set
3. ksnider1: full set
4. toufu : (IV + Supply For IV) x 2
5. ferrari: (IV + Supply For IV) x 2
6. analogdiy: full set
7. wobii: full set
8. Cobra2: (IV + Supply For IV) x 2
9. mikelm: full set
10. le´flu: just one salas reg please
Hi all! the next weed i will finis all PCB for 9-15 member !
2. boudy : full set
3. ksnider1: full set
4. toufu : (IV + Supply For IV) x 2
5. ferrari: (IV + Supply For IV) x 2
6. analogdiy: full set
7. wobii: full set
8. Cobra2: (IV + Supply For IV) x 2
9. mikelm: full set
10. le´flu: just one salas reg please
Hi all! the next weed i will finis all PCB for 9-15 member !
Attachments
Hi,
I would also delete LM338 from schematic to avoid complications and leave LT1084 or LT1085 so you have only to play with R8 and R9
1. Strosek: full set
2. boudy : full set
3. ksnider1: full set
4. toufu : (IV + Supply For IV) x 2
5. ferrari: (IV + Supply For IV) x 2
6. analogdiy: full set
7. wobii: full set
8. Cobra2: (IV + Supply For IV) x 2
9. mikelm: full set
10. le´flu: just one salas reg please
11. jasujonas: full set
2. boudy : full set
3. ksnider1: full set
4. toufu : (IV + Supply For IV) x 2
5. ferrari: (IV + Supply For IV) x 2
6. analogdiy: full set
7. wobii: full set
8. Cobra2: (IV + Supply For IV) x 2
9. mikelm: full set
10. le´flu: just one salas reg please
11. jasujonas: full set
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