Vintage Asylum

RE: Marantz 8b power transformer

128.48.7.107

In Reply to: RE: Marantz 8b power transformer posted by CompNut on June 04, 2007 at 20:32:57

Hello, CompNut:

I assume that you examined the schematic?

If not, it is available over here, courtesy of Triode Electronics:
http://www.triodeel.com/marantz8.gif

You should be able to calculate the needed voltages from the diagram, methinks.

Good luck locating a replacement power transformer. I believe that they were custom-wound. I have no idea of the exact current ratings of the originals, however and I do not believe that that specification was mentioned in the service data.

For reference purposes and to see an example of an unaltered unmodified 8-B, please examine assorted images posted to eBay of such units being offered for auction.

The most common cause of failures in an 8-B seem to be related to failed rectifier diodes, but this is very rare, with the exception of the 1/2-wave selenium, mounted on the back skirt of the chassis, secured to it by means of a threaded screw and nut. Those should always be replaced, counter to the cult of idiots who prefer to never touch the amplifier at all. All I can say to them is "KABOOM!", followed by lots of weeping.

Good luck to you!

Richard Links
Berkeley, CA

Follow Ups:

RE: Marantz 8b power transformer - CompNut 19:41:07 06/11/07 (1)
- RE: Marantz 8b power transformer - Marantzguy 10:26:07 06/14/07 (0)

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