Need help understanding this transformer

[ampedup]

http://www.hammondmfg.com/166.htm I have this trans powering two gz34s in my sunn 2000s clone. My question is about the center tap. I tried hooking it to ground and it was a direct short, popping my fuse. What is it if its not a ct and should I make an artificial ct?

[randalp3000]

I assume you're using a 5 volt trans for the heaters if so you can not use the center tap. I found this out the hard way.

More info is always helpfull.

[gldtp99]

The 5V heater circuit does not use a center tap----- look at this schematic:

http://www.webphix.com/schematic%20heav ... _2000s.pdf

Disconnect the CT from ground, insulate the running end (shrink wrap), fold it up and tie wrap it in a secure location.......................gldtp99

[ampedup]

whats the red/yellow wire to ground on that schematic?

[Colossal]

The red/yellow wire shown on the schematic is the center tap for the high voltage secondary. If the Hammond transformer you are talking about above (you haven't said what model it is) is a 5V filament transformer then you don't want to use the center tap (on the Hammond), if it has one.

[Firestorm]

whats the red/yellow wire to ground on that schematic?

Center tap on the plate supply (where you do need one). Center tap on the filament supply can't be grounded because that's the rectified +DC "output" (and can actually be used for that with directly heated rectifiers).

[ampedup]

Sorry, its the 166rs . thanks for the reply.

[shane]

You could use the 5V transformers CT to supply the B+ instead of coming off one leg of the 5V winding.
A lot of Hammond power trannys have a 5V CT winding.
Cheers
Shane