The regulated 90 volts is for the detector. The RAK and RAL are some of the best regenerative receivers ever made, and have the smoothest control over regeneration. A  steady voltage is vital to stable regeneration control. I have had the receivers over the years, and didn't always regulate the 90 volts. For typical use, it doesn't matter much. However, for serious DX, the regulation helps get a regeneration setting just on the verge of oscillation where sensitivity is maximum.

    B.Gentry, KA2IVY

Since the RAK/RAL has come up, what is the deal with the 90 volts?  I built a supply for my RAK which I acquired first and put in a  regulator circuit using a 90 volt reg. tube that I just happened to have, it glows orange, but the radio worked just fine with or without the 90.  My other supply for the RAL is the correct supply for it and got that from Brian KN4R.  The only problems so far after a decade or more has been replacing the 1uf caps and other large bypass caps, tubes I have found plenty of.  That one stacked cap under the chassis might be a concern, but if need be, could be subbed with individual bypasses if it ever fails.  The RAK gets its most use during the winter when I am looking for NDB's, using it or a Mackay 128XX, the RAL gets used throughout the year.

Charlie in NC.

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