Wall wart specs for Sopht amp?

[smashinator]

It's likely that I just missed the details somewhere, but I just searched the sopht threads on this forum and read through the Sopht site again, and I don't see how much current the wall wart needs to be able to supply.  Is 1 amp sufficient, or will it need more than that?

[slajeune]

Hi,

I am using a 12v 1.6A wallwart.  If you can find a bit beefier (14v > 1.2A), it should do the job nicely!

Thanks,
Stephane.

[smashinator]

Thanks for the info!

Just so I'm clear, I would use a regulator chip to get my voltage down to 12v, right?  Or do the tubes suck enough current that the voltage will drop on it's own?

[Luap]

I See Stephane already got this one (while I slowly typed)!:oops:

Also ...probably a good idea to measure AC voltage on any wart before you power up- the one I tried had a 12V ripple! --bbbBBBZZZzzzzzz!!!!

You don't want to go much more than 13V on the heaters, how much the voltage will drop really depends on the wart. Measure it under load- they very greatly from whats on the lable.  Lower than 12V is ok, it just won't be as loud. (splitting hairs)


---------Sopht amp current--------

12u7=150mA(h) + <1mA(plate) = 151
12k5=450mA(h) + 35mA (plate) + 85mA(SC-grid)= 570

Current for 12k5 version = ~721mA


12u7=150mA(h)+`1mA = 151
12al8=550mA(h) + 1mA (plate) 35mA(plate) + 85mA(SC-grid) =671

Current for 12al8 version = ~822mA
-----------------------------------

Luap

[smashinator]

Cool!  Thanks for the help!