Re: PR machine gun

[KeyboardSystems@sisna.com (Jim Duane)]

Ken,

        If all else fails, we at Keyboard Systems offer a replacement PR
cabinet (solid state) amplifier for $199.00.  It does not have reverb, but
you can add Trek II reverb to the organ which is much better reverb than
the old necklace reverb springs.

Jim Duane
Product Manager
Keyboard Systems

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>I own an RT-3 with two PR tone cabinets, bought by the original owner
>in 1971. It's in great shape, but every year it develops a summer
>peculiarity: as the humidity increases (I live in the far North, so
>this is rather brief) one of the cabinets, a PR 40, begins to hum --
>sometimes loudly. In the past I have lived with it, since it passes
>with the coming of cooler weather. But this year that PR 40 has
>learned a new trick. After being on for about 15 minutes, it begins to
>stutter out machine-gun like explosions of sound. It got so bad I had
>to disconnect it, and rely solely on the PR 20.
>
>Can you technical experts give me a clue? Is a sick tube the most
>likely cause? An output tube? Or is an aging resistor or capacitor
>more likely?
>
>Many thanks for any insights -- two cabinets sound better than one!
>
>Ken LaFleur