I would like to build a B supply for a 6 tube (201As) radio, with B voltages 45, 67, 90, and 135 approximately. In terms of a transformer, what should I be looking for as far as AC output on the secondary winding, in order to feed a bridge rectifier and filtering?

:I would like to build a B supply for a 6 tube (201As) radio, with B voltages 45, 67, 90, and 135 approximately. In terms of a transformer, what should I be looking for as far as AC output on the secondary winding, in order to feed a bridge rectifier and filtering?
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Hello Brian, best bet [at least I think so] would be to order the pwr sply from AES. I have one, and it has those B+ voltages

Building a supply is lots of fun and a learning experience. For the highest range... 135V DC you will need a 150 V rms secondary voltage. I assume you will use a 4-diode bridge with capacitive filter.

http://www.hammondmfg.com/pdf/5c007.pdf

From there, you will need voltage regulators, or an array of zener diodes, to give you the lower voltages.

Rich

:I would like to build a B supply for a 6 tube (201As) radio, with B voltages 45, 67, 90, and 135 approximately. In terms of a transformer, what should I be looking for as far as AC output on the secondary winding, in order to feed a bridge rectifier and filtering?
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The current draw of most of the stages of this radio is not much (especially the detector). The simplest power supply (and least expensive) would be a solid state bridge rectifier connected to the AC line to make an AC-DC power supply. A divider resistor would give you your necessary voltages. You might not see as high as 135, but you could easily get 110 or maybe 120.

The AC/DC supply does pose a shock risk, and so a simple isolation transformer can also be added, which can either be a transformer designed for the purpose, or two of the more robust filament transformers from Radio Shack wired back-to-back. If this does not provide enough voltage, then a higher voltage transformer will be necessary. Higher voltages allow for large chokes, which can remove excessive hum.

...Or else you can also build the B supply kits as others have suggested.

For my Radiola 16, which I rarely use, I utilize a Majestic B supply which I restored. I replaced all of the paper capacitors and wiring. It provides plenty of voltage, but is not well regulated, and so you will run into trouble in circuits that use adjustable voltage for regeneration and volume control. Otherwise it is a very nice period correct power supply that will look good next to any radio. I purchased the thicker twisted black (16 gauge, I believe) AC cord from www.sundialwire.com, and gave it a very attractive line switch and plug, since the Majestic B does not have an internal power switch.

T.