ST70 power cord.

steve f wrote:Hi,
New to this forum. I'm going to change a cracked power cord.
The new cord (not stock) is polarized. Is there a preferred
connection for the hot lead? And is it common to the other Dynaco products?
Thanks,
Steve

wharf-creek wrote:
....and that is, that the WHITE wire (hot) should be fused, while the black wire (ground) should be the one to go directly to the transformer. And, green should go to the chassis.

Captain Coconut wrote: Yes, black wire is always hot. But what I don't understand, is why on a ST70, one of the leads from the power cord goes to "B" on the fuse holder and on the ST35 the same lead goes to the "A" post.

Luddite wrote:
When I recently built my own ST-35, I did wire the black lead of the power cord to the "B" post on the fuseholder. Electrically it makes no difference since the fuse is in series either way you wire it. As for the Dynaco drawings, Maybe there were two different individuals who drew the pictorial diagrams. One chose "A" and one chose "B". Both choices would be compatible with the schematic diagram.

Best Regards,
Charlie

Captain Coconut wrote: ...If I were to add an off/on switch to the ST35, it would seem that I could wire it the same way that it's done on the ST70. Or I could wire it like the ST35 shows, but run a wire from the fuse to the switch and from the switch to the transformer?

Luddite wrote: Another suggestion; I also soldered a 0.01 microfarad, 250VAC, 2KVDC, ceramic capacitor across the switch contacts. This dampens any switching transients (pops) that might occur at turn-on or turn-off.

Bugs wrote:Could someone explain the older vs. newer two wire power cords to me. By older I mean the original cord that came on my ST 70 where the male wall plug consisted of two prongs of equal dimensions vs. the new two wire plugs where one of the prongs is a lager dimension than the other and can only be inserted into the outlet one way. On the newer, which prong is hot and which is neutral and if either wire is hooked up to the fuse, will it make a difference?

Thanks

tubes4hifi wrote:BLACK IS HOT AND TO THE FUSE, WHITE IS NEUTRAL, GREEN IS EARTH GROUND

JunkyJan wrote:... I'm quite surprised that such simple common-sense safety precautions are not mandatory in the U.S. - guess it is too difficult to enforce as Federal regulation, perhaps? (My quirky sense of humour tells me that perhaps with a population of 250 million ya can afford to lose a few here and there!)

-- 'Jan

natoe wrote: As a member of one of the biggest electrical unions in the country we have set up some of the common sence things that are part of our installs,like putting the ground up on recepticals and some other things.