[R-390] Dead R-390A

[Bill Keller]

Hi, Group.  I've got a problem and need some advice.  My R-390A just went dead - no sound, not even a calibration signal.  All the tubes and dial lamps are still lit up, and the fuses all check ok.  I've checked the speaker and all associated connections and they're fine.  Before I start doing things I may not need to do, does anyone have an idea to share with me that might help me find the trouble quicker.
Thanks,
Bill K.