George, Since this receiver is new to you don't overlook the possibility of MULTIPLE problems. I serviced a R-4B last year that had similar symptoms, among others, to yours and it turned out to have several bad tubes and resistors. Of course I had swapped tubes in order to isolate the problem but I was actually swapping one bad tube for another! Talk about chasing your tail!
Have you checked all the voltages and resistances against the corresponding charts in the manual? That is a good place to start with a new rig with an unknown history. Keep us posted on your progress. Ken, WA2LBI Quoting Garey Barrell <[EMAIL PROTECTED]>: > > George - > > OK.. > > Measure the voltage at TP-2 (on top of the chassis, just in > front of the Passband tuner.) Should measure -1.35 volts > with the the Preselector detuned on any band. > > Have you tried both Fast and Slow AVC? If no AVC in either > position, try swapping the Calibrator tube, 12BA6, with > either of the IF tubes, V4 or V5. Something is loading the > AVC line. If this doesn't help, try swapping the RF Amp, V1 > with another 12BZ6. > > Beyond this, you'll have to find what is either loading or > shorting the AVC line. Possibly one of the grid resistors > of V1, V4 or V5 cracked or open. They can go up in value > considerably without affecting the AVC, so unless they are > open, look elsewhere. > > Let us know what you find. > > 73, Garey - K4OAH > > > > George wrote: > > > To add to that it is an 11 tube model (no 12av6) > > > > George NE2I > > ----- Original Message ----- > > From: George > > To: [EMAIL PROTECTED] > > Sent: Thursday, April 08, 2004 9:00 PM > > Subject: [drakelist] R4A AGC inop. > > > > > > Just bought an r4a and it seems like the agc is not working at all > > I have to ride the rf gain or I get way too much audio and distortion > > It has good sensitivity and is spot on frequency wise. > > > > Also when I select NB or cal the s-meter pegs and I dont get any audio. > > > > Thanks > > George NE2I > > > > > ---------------------------------------------------------------------- > Submissions: [EMAIL PROTECTED] > Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in > body > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > Brought to you courtesy of TLCHost.net http://www.tlchost.net/ > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ----------------------------------------------------------------------
