The bridge will give you nearly 200 volts without load but it won't isolate the supply from AC line. If your "B" supply shorts to either side of the AC line you will have a flash and blow components.
You can build an isolated supply without expensive transformer. Why not use 2 - 12 volt back to back. The first one gives "A" voltage the second "B" isolated from the line. I'll send some information..
Norm
: Seems to me that one could use a bridge rectifier on 115 AC to get over 200 DC. If you used a grounded chord the danger of a hot chasis would be eliminated. After the filter caps and choke in such a supply you would have more amps than could be used. Use a RS 12 V center tapped transformer for your "A" side. This idea would could eliminate a $50 or more, transformer. I must be missing something here. Seems like a simple, safe, and extremely effective scheme.
Norm
Seems to me that one could use a bridge rectifier on 115 AC to get over 200 DC. If you used a grounded chord the danger of a hot chasis would be eliminated. After the filter caps and choke in such a supply you would have more amps than could be used. Use a RS 12 V center tapped transformer for your "A" side. This idea would could eliminate a $50 or more, transformer. I must be missing something here. Seems like a simple, safe, and extremely effective scheme.
You can get close to 200 volts at the price of current available. Depending on how many tubes you are using, and the types, this may not even be a factor. For liability reasons, some values are not printed, however you can use the basics of some of the direct links that I have to modify to your needs.
Depending on application, tubes in use, and how many you are using, you may not really need the 200 volts.
The down side is that these schematics as well as what you have proposed; have one side potentially attached to the "hot" side of the power line, You can minimize risk by making sure to use a polarized plug, and keep all of the chassis connections isolated from anything someone may contact in general usage. (no open chassis, bare screws, metal knobs, etc.) Your grounded power cord will be just that much more insurance if you attach the green ground wire to the chassis itself. (Some of the computer cords are wired to a japanese or Korean standard which utilizes a bare ground with a green and blue wire. Unfortunately the blue wire and green wire are not consistently associated with one side of the plug.)
Also, depending on the radio wiring, you may want to put a small value cap in line with the antenna for those cases where the antenna may ground out.
: Seems to me that one could use a bridge rectifier on 115 AC to get over 200 DC. If you used a grounded chord the danger of a hot chasis would be eliminated. After the filter caps and choke in such a supply you would have more amps than could be used. Use a RS 12 V center tapped transformer for your "A" side. This idea would could eliminate a $50 or more, transformer. I must be missing something here. Seems like a simple, safe, and extremely effective scheme.