Massive resistor after Primary filter caps.

[joesatch]

What is this 10W 400R dale resistor for?

[tubeswell]

That's between the plate and screen supply nodes, so its part of the R/C filtering

[sluckey]

It's purpose is to drop voltage to the rest of the B+ string. 400Ω/10W is not MASSIVE.

[shooter]

I used I^2 R 
100mA^2*400 = 4W
that's probably in the danger zone for the stuff downstream to be pullin

[sluckey]

I used I^2 R 
100mA^2*400 = 4W
that's probably in the danger zone for the stuff downstream to be pullin

Did you just make up those numbers? You ain't out in the bait shop are you?

[uki]

this is massive !!

[joesatch]

i believe i found the answer on the interwebs..

[thetragichero]

it is certainly cheaper, but can also be a design choice

[AmberB]

Pretty much standard procedure for Bogan tube amps...I've never seen one with a choke.

[kagliostro]

If the position of the resistor on the schematic will be before the first node, also because on the schematic are indicated parallel connection, the purpose of that resistor can be SAG resistor (also the resistence value is compatible)

but as it is after the first node the only explanation is that to which refers Sluckey

--



Franco

[shooter]

out ain't out in the bait shop are you?

there is logic behind the #'s
I was "looking" for 5W, then double n ship!
but to answer the ?   


Aside
we used foot long 1" diameter Resistors in a large Amp PS, they were ceramic coated, the PS's typical fail started with the Ceramic melting off and it goes down-hill from there!

[AmberB]

When the ceramic melts off your resistors, you definitely have a problem...

[Willabe]

When the ceramic melts off your resistors, you definitely have a problem...

              

[shooter]

I looked for the pics but they are lost in space
the heat on the top of the box was enough to melt the Aluminum, and "etch" really nice colors into the cover.
I did a painting of it n gave it to the Boss   


the box was so hot I just left it for 12hrs.
after the field reported many such cases the real Engineers finally put down their coffee and came up with a fix.