clarification of aikido heater supply

[jarthel]

I found this mentioned in the 9pin aikido pdf
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The board assumes that a DC 12V power supply will be used for the heaters, so that 6.3V heater tubes (like
the 6FQ7 and 6DJ8) or 12.6V tubes (like the 12AU7 or 12AX7) can be used. Both types can be used
exclusively, or simultaneously; for example 6GC7 for the input tube and a 12BH7 for the output tube. For
example, if the input tube (V2 and V3) is a 12AX7 and the output tube is a 6H30 (V1 and V4), then use
jumpers J1, J5 and J6.

Although designed for a 12V power supply, a 6V heater power supply can be used with the PCB, as long as
all the tubes used have 6.3V heaters
========================

The last statement is confusing. I thought I could use different types of heaters as long as I have the power supply to use.

off-topic but since you're reading this already: Are C7 to C10 soldered off the pcb?

Thanks for the help

[leadbelly]

The 9-pin board is set up to power 6V tubes with pins 4 & 5 heater connections, and tubes like 12AX7 and 5687 with a heater common pin of 8 or 9, using only one supply for both. If you don't add the jumpers between T1 and T2, you can use separate supplies.

Not to sound negative, but should you playing around with 200+ V if you can't follow the traces on a single-sided PCB? Low attention span?

[jarthel]

Originally posted by leadbelly


Not to sound negative, but should you playing around with 200+ V if you can't follow the traces on a single-sided PCB? Low attention span?

I have built a tube amp already. I have conducted electronic/electrical experiments when I went to the university.

I can't follow the traces cause I don't have the pcb yet.
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but thanks for the reply

ps. don't you mean "short attention span"?