Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: worth on May 22, 2012, 02:06:28 pm

Title: Hammond 270FX Primary wires ?
Post by: worth on May 22, 2012, 02:06:28 pm

I just received this PT.. it's got three primary wires , white , black , and grey. What IS the grey wire ? It's not really clear on the wiring diagram ?

Title: Re: Hammond 270FX Primary wires ?
Post by: HotBluePlates on May 22, 2012, 02:12:38 pm

Scroll to the bottom of this page (http://www.hammondmfg.com/263.htm).

Apparently, Hammond made a change to their PT's in 2009, but they still haven't updated the diagrams on their boxes. I got a Hammond PT a few months ago, with the same lack of indication on the diagram for the gray wire.

I suggest using the 125v wiring (white, black wires) to avoid the too-high voltage that used to be common with Hammond PT's.

Title: Re: Hammond 270FX Primary wires ?
Post by: sluckey on May 22, 2012, 02:14:30 pm

Use white and grey if your line voltage is 115VAC. Use white and black if your line voltage is more like 125VAC.