Intro: Stephe's original BOM called for the EDCOR trafo (as our EU friends call them, and it's easier to type) which developed a short.

Note where the 50+ volt bias is coming off the 6.3 VAC winding.

Enter the Hammond 273BX which was wired differently (from Mouser.com's page)

Red/Yellow "High Voltage" is reference ground for Red/Red, NOT 50 VAC. 50 VAC comes off the GRN/YEL for Filament #2 and does go to ground in the bias circuit.

HERE is my question:

From the Hammond 374BX data sheet (https://www.mouser.com/datasheet/2/177/300-951115.pdf):

First: IGNORE Filament #1 (refer to PDF if any questions), there are only two LV outs on this model.

Second, the 50 VAC comes from between the two RED HV lines, Red/Yel goes to ground.

Third: YEL/YEL goes to rectifier heater, CT Yel/Blk not used.

On the 274BX the Grn/Yel line between the two GRN 6.3 VAC is for 50 VAC.

Does it (Grn/Yel) go to ground for the 374BX as reference ground for the GRN/GRN leads to the 6SN7 heaters??

If the answer is obvious, and yes, please affirm.

I've looked at several dozen different schematics for tube amps from Aiken, Robinette, Valvewizard to Stephe and many others and see a YUGE variation in how different amps/trafos get wired so this has me confused enough to post before I finish wiring what I've started.

Thanks in advance.

Norm