i solved the blooming hv problem. had to back down the agc and kine bias. the horiz out is pulling 220ma. the book says not over 200ma. BUT voltages throughout the set are higher because of strong line voltage. QUESTION hoe warn should the fly be after the set is on for about 30 minutes. this one is pretty warm. the regulator tube and hv tube is enclosed with the fly in a steel cage.<BR>any thoughts. i surfed the net and found even when new the 21cyp22 pix tbues were not bright i was pushing it to far. thanks steve<P>------------------<BR>

Steve,<P>Glad to hear that my suspicions about the CRT hogging too much current because the kine bias was too high was spot on. Trouble is now I gotta go to the clinic and have my arm looked at, it hurts from patting myself on the back. <IMG SRC="http://www.antiqueradios.com/forums/smile.gif"><P>Just because the AC line is hotter than the set was made for I don't think in itself would create an overly high H.O.Tube current condition. I suppose you could add some resistance to the screen grid of the H.O.Tube to reduce the cathode current flow just enough to bring it down to 200 mA. This will decrease the available width a little bit, so if you are no presently blessed with abundant width, don't do it.<P>You have tweeked the Horizontal Efficiency coil for minimum cathode current...right?<P>As for how warm the flyback is getting, if the book wants 200 mA, I'd try to get it that low, those flybacks get enough thermal abuse even at proper ratings with all the heat in that doghouse.<P>Glad to see you are nearly there.<BR> <BR>Rob<P>------------------<BR>

related question...if my set has individual "screen" controls and individual 'background' controls, I still am not sure how these relate to 'bias' and 'gain'. One book said to make the pic tube last the longest you want to keep the 'kine gain' down - is this the screen controls? And background is bias? Or the other way around? Neither? thanks...Mark French

i hope you didnt pay the clinic. the kine bias is not the pronlem. the high voltage is still low. it is pointing toward a bad focus coil. will keep you posted. steve<P>------------------<BR>

Don't worry Steve, the doc said my pain wasn't from being clever, its just arthritis!<P>I fail to see how a bad focus coil could cause the CRT to hog so much current. Apparently it is or you wouldn't have been seeing such a bright raster. In my experience with an excellent 21FJP22, at 12 kV you hardly get any light out of that CRT, so even if your HV is low in part because of a problem with the focus coil and thus the Q of the H. o/p stage is reduced, this doesn't explain why the CRT is hogging so much current. That would be related to Kine Bias and other gun voltages. Did you ever disconnect the ultor lead on the CRT as I suggested at the beginning and see what the HV supply does then?<P>Rob<P>------------------<BR>

voltage is the same with anode lead pulled from crt. steve<P>------------------<BR>

Steve,<P>With the CRT ultor disconnected have you also measured the HV with the anode cap disconnected from the shunt regulator to determine if it is shunting the HV low?<BR>That voltage should soar to nearly 30 kV in that condition. Don't leave it on longer than it takes to make this measurement in case of insulation breakdown damage. I'd have the HV probe connected so that you don't have to waste time hand positioning it and have my hand on the AC plug to shut down quickly after the reading stabilizes.<P>Rob<P>------------------<BR>

the ctc10 is working great now. the .1 200v cap on the horiz center was leaky as was the .15 on the horiz effic. coil. i will post pics if someone can tell me how to do this.<BR>steve<P>------------------<BR>

That's great news Steve! When you open a reply note the hotlink at the bottom of the composition page called *Forum Code. Click this and it will give you instructions for imbedding a photo. You will need to have it posted at your website address (like an FTP file area at your server) or one you can specify for this to work. Alternately you can put them in the Forum's photos section.<BR>I'm sure many would enjoy seeing the photos including myself.<P>Rob<P>------------------<BR>