Gary, I would take a chance on it after running it for a few days.If you are worried about liability,you would be dead meat if there was trouble and it was obvious you modified the design.Get a good buck for it and good l;uck. al Al Leatherman 224 Rt. 46 Mine Hill, NJ. 07803 973-361-5796 WWW.ALS-TV.NET ----- Original Message ----- From: "Gary McCartney" <gary@xxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Monday, August 18, 2003 10:29 AM Subject: [TechAssist] JVC TV AV2749S, anode HV level at 30kV- too high? > I have this JVC TV, model JVC TV AV2749S in the shop. I had to change > the yoke because it was burnt. I used a 27" yoke that physically looked > exactly the same except for the connectors so I switched the connectors > over from bad yoke. The geometry of the picture looks fine except that > the picture is too wide (by about an inch or more). I have no way of > knowing if it is this yoke causing this, or if the problem existed > before and possibly even caused the original yoke to fail. > > Here is the data I can provide: > > -HOT collector waveform : 1200V p-p -perfect looking (no blips) > > -HV anode: 30kV at zero beam current > > -regulated B+ at output of STR30130 regulator: 130.1 Vdc > > - temperature of HOT heatsink after 1 hour run, > taken directly above the HOT case: 44 deg. C (119 deg. F) > > - temp of B+ reg. heatsink after 1 hour run: 55 deg. C (130 deg. F) > > > - if I change C525, 0.0062uF 1600V at HOT collector to a 0.0051uF, the > picture narrows by approx. 1 inch but the HOT collector waveform rises > to 1250V p-p and the HV anode level goes to 31kV. The heatsink > temperatures stay approx. the same. > > > The main question I have: Is 30kV or even 31kV too high to safely run > this set at? I'd like to get it closed up and outa here. Any opinions, > please. > -- > > > > > Gary McCartney > > McCartney Electronics > Guelph Ontario Canada > Est. 1984 > email: gary (at) number63.ca > > **************************************************************************** * > Classifieds! Buy or Sell! > http://sell.tech-assist.org > The Tech Address Book: > http://www.tech-assist.org/secure/tip/contact.htm > Add a Repair Tip Here, or Change/Remove your Email Address: > http://www.tech-assist.org/secure/tip/main.htm > Lost Password: > http://www.tech-assist.org and select "Lost your Login Info?". > Email Archives: > //www.freelists.org/archives/techassist/ ***************************************************************************** Classifieds! Buy or Sell! http://sell.tech-assist.org The Tech Address Book: http://www.tech-assist.org/secure/tip/contact.htm Add a Repair Tip Here, or Change/Remove your Email Address: http://www.tech-assist.org/secure/tip/main.htm Lost Password: http://www.tech-assist.org and select "Lost your Login Info?". Email Archives: //www.freelists.org/archives/techassist/