Pwr supply question

[Rick90405]

Hi everyone,
I am building a JE labs simple 45, old version.
My PT is Hammond 272DX, I get a B+ of 420v from a 5U4.
I used the 2 red leads to the plates, red/yellow CT to ground.
From 8 pin 50ohm resistor 10uf cap choke 47uf cap.
Any ideas? Where did I go wrong?
The 2.7k resistor on the B+ to the OT have burned out.
Richard

[DeathRex]

Your 420 B+ is unloaded.

The 2.7k resistor on the B+ to the OT have burned out.

Not supposed to be a resistor from B+ to the outputs.

The rest of it seems right.

[Rick90405]

Thanks for your answer, but schematics show these resistors, unless they should go at another place.
More thinking to do.
Richard

[battradio]

Please post the schematic you have or direct us to them

[Rick90405]

The schematics are the first version of Jelabs simple 45, not the srpp.
My copy is pretty bad, but I can try to scan it.
It's no longer on the website.
I will see what I can do.
Thanks.
Richard

[DeathRex]

It's in Tom's site. http://www.wdox.com/pics/simple45sch.jpg
The 2.7K 2W is a filter resistor from B+ to the 100K that feeds the 6SL7.
B+ should go from the choke to the output. Fix that and you might be good.

[Rick90405]

Thanks, I will try.
Still worried about having 420v of B+, could that damage the output trans?

[DeathRex]

The output transformer should be able to take 630 or a little higher.

JL used a 5Y3, using a 5U4 your B+ will be a little higher when loaded, like 340-350. To lower the B+ you can insert a resistor infront of the 50 ohm, or get a 5Y3, or 5Y4, you have to move a wire in the socket for a 5Y4.

[Rick90405]

Yes I noticed, on Tom schematics, it says 5Y3, will dig in my rectifier box to find one.
Cheers!