"Jim F." <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- I see that tube bias is a big problem in these sets.
Any chance of fusing the cathode resistors to would help stem the bias problem ? Do you think a couple of cathode wired-in-series fuses work ? Jim --- Bill Carpenter <[EMAIL PROTECTED]> wrote: > > "Bill Carpenter" <[EMAIL PROTECTED]> made an utterance to > the drakelist gang > ---------------------------------------------------------------------- > I did move the T4XB to plug/unplug my straight key > so that is a possibility. > Thanks for the tip and Gary I don't disagree that it > was a bias problem. > I'll get new resistors and we'll see. > ----- Original Message ----- > From: "Robert Ladden" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Tuesday, January 01, 2008 12:08 PM > Subject: Re: [drakelist] T4B Trouble > > > > > > Robert Ladden <[EMAIL PROTECTED]> made an > utterance to the drakelist gang > > > ---------------------------------------------------------------------- > > Did you move things around when you switched rigs? > I found (the hard way) > > that it is possible for the cinch connector to get > in an angle where the > > bias pin loses contact. > > > > 73, > > Bob WW3QB > > > > At 12:05 PM 1/1/2008, you wrote: > > > >>"Bill Carpenter" <[EMAIL PROTECTED]> made an utterance > to the drakelist gang > >>---------------------------------------------------------------------- > >>Power supply seems OK. Bias adjusts from -49 to > -90 and voltages at 279 > >>and 682. Both a little high but seem OK to me. > Anything else I should > >>check before I try replacing the cathode > resistors? Gotta wait to order > >>some anyway. > >>----- Original Message ----- From: "Garey Barrell" > <[EMAIL PROTECTED]> > >>To: <[EMAIL PROTECTED]> > >>Sent: Tuesday, January 01, 2008 10:34 AM > >>Subject: Re: [drakelist] T4B Trouble > >> > >> > >>> > >>>Garey Barrell <[EMAIL PROTECTED]> made an > utterance to the drakelist > >>>gang > >>>---------------------------------------------------------------------- > >>>Yep, that's it. It's adjustable to set the idle > current for the finals. > >>>No bias voltage = full plate current! > >>> > >>>73, Garey - K4OAH > >>>Glen Allen, VA > >>> > >>>Drake 2-B, 4-B & C-Line Service Supplement CDs > >>><www.k4oah.com> > >>> > >>> > >>> > >>>Bill Carpenter wrote: > >>>> > >>>>"Bill Carpenter" <[EMAIL PROTECTED]> made an > utterance to the drakelist gang > >>>>---------------------------------------------------------------------- > >>>>Thanks Gary, I'll look at the AC-4 though I > replaced the electrolytics a > >>>>few years ago. Which pin is the bias measured > on? It looks like pin 9 > >>>>to me at -45 to -65 volts against pin 1 which is > ground? > >>>> > >>>>----- Original Message ----- From: "Garey > Barrell" > >>>><[EMAIL PROTECTED]> > >>>>To: <[EMAIL PROTECTED]> > >>>>Sent: Tuesday, January 01, 2008 9:46 AM > >>>>Subject: Re: [drakelist] T4B Trouble > >>>> > >>>> > >>>>> > >>>>>Garey Barrell <[EMAIL PROTECTED]> made an > utterance to the drakelist > >>>>>gang > >>>>>---------------------------------------------------------------------- > >>>>>Bill - > >>>>> > >>>>>Sounds like you lost the bias supply in the > AC-4, electrolytics and/or > >>>>>rectifiers. There has been some discussion of > this over the last few > >>>>>weeks on here. > >>>>> > >>>>>The AC-4R kit from The Heathkit Shop is the > best answer for AC-4's that > >>>>>still have their original electrolytics. > >>>>> > >>>>>You got lucky in that the cathode resistors > opened! Carbon comp > >>>>>resistors are pretty hard to find. Best > replacement is the Ohmite OX > >>>>>ceramic composition resistor available from > Mouser and others. > >>>>> > >>>>>73, Garey - K4OAH > >>>>>Glen Allen, VA > >>>>> > >>>>>Drake 2-B, 4-B & C-Line Service Supplement CDs > >>>>><www.k4oah.com> > >>>>> > >>>>> > >>>>> > >>>>>Bill Carpenter wrote: > >>>>>> > >>>>>>"Bill Carpenter" <[EMAIL PROTECTED]> made an > utterance to the drakelist > >>>>>>gang > >>>>>>---------------------------------------------------------------------- > >>>>>>I was enjoying SKN last night on 40M with my > Bline but decided to > >>>>>>switch to my K2/100 to use a more effective NB > against bad powerline > >>>>>>noise that has popped up here recently. I > left the Bline on and was > >>>>>>happily CWing away when the Bline kind of > "blinked" so I turned it > >>>>>>off. Later I found no output at all so > suspecting finals I checked > >>>>>>them and yes they were bad. I put good ones > in and still no output. > >>>>>>There had been no noise, smoke or burned sound > so I had not looked > >>>>>>under the finals. I did that this morning and > found R32 and R33 (1 > >>>>>>watt 15 Ohm) both burnt and testing very high > or open. Obviously I > >>>>>>need to replace these but is there anything > else I should check first > >>>>>>to see what may have caused this to happen? > >>>>>> > >>>>>>Any help appreciated. > >>>>>> > >>>>>>Happy New Year! 73 > >>>>>> > >>>>>>Bill > >>>>>> > >>>>>>NZ0T > >>>>> > >>>>>---------------------------------------------------------------------- > >>>>>Submissions: [EMAIL PROTECTED] > >>>>>Unsubscribe: [EMAIL PROTECTED] - > unsubscribe drakelist in > >>>>>body > >>>>>Hopelessly Lost: [EMAIL PROTECTED] - > help in body of message > >>>>>Zerobeat Web Page: www.zerobeat.net - > sponsored by www.tlchost.net > >>>>>---------------------------------------------------------------------- > >>>> > >>>> > >>>> > >>>>---------------------------------------------------------------------- > >>>>Submissions: [EMAIL PROTECTED] > >>>>Unsubscribe: [EMAIL PROTECTED] - > unsubscribe drakelist in > >>>>body > >>>>Hopelessly Lost: [EMAIL PROTECTED] - > help in body of message > >>>>Zerobeat Web Page: www.zerobeat.net - sponsored > by www.tlchost.net > >>>>---------------------------------------------------------------------- > >>>> > >>> > >>>---------------------------------------------------------------------- > >>>Submissions: [EMAIL PROTECTED] > >>>Unsubscribe: [EMAIL PROTECTED] - > unsubscribe drakelist in > >>>body > >>>Hopelessly Lost: [EMAIL PROTECTED] - help > in body of message > >>>Zerobeat Web Page: www.zerobeat.net - sponsored > by www.tlchost.net > >>>---------------------------------------------------------------------- > >> > >> > >> > >>---------------------------------------------------------------------- > >>Submissions: [EMAIL PROTECTED] > >>Unsubscribe: [EMAIL PROTECTED] - > unsubscribe drakelist in body > >>Hopelessly Lost: [EMAIL PROTECTED] - help > in body of message > >>Zerobeat Web Page: www.zerobeat.net - sponsored > by www.tlchost.net > >>---------------------------------------------------------------------- > === message truncated === ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
