Im Having problems finding a reliable economical source for .0047, .00047, .03, .002, etc 6000 volt caps for electroststic TV's. ASC makes them but often I have to wait several weeks or buy large quanities. Prices are high as well, $2.00 to $2.50. If I buy 100 the price drops to about $1.50. Any Ideas or possibly a coop buy?<BR>Charles Azar<P>------------------<BR>chuck azar

Allied Electronics has them in small quantities, quick shipping, though the prices are about the same as ASC.<P>------------------<BR>

allied's supplt is very sporatic. That is who i've been buying from and now they don't have .03's or .00047's and they want a min. order of 100.<BR>Chuck AZar<P>------------------<BR>chuck azar

Hi , How about Newark or Digi-key??<BR> <P>------------------<BR>

Newark or Digikey do not have any 6000 volt caps.<BR>chuck azar<P>------------------<BR>chuck azar

Newark or Digikey do not have any 6000 volt caps.<BR>chuck azar<P>------------------<BR>chuck azar

Interesting! How could you need very many such caps.<P>------------------<BR>

I restore pre 1950 TV's and specialize in electrostatic sets. Each set has at least 4 or 5 of these caps. Anyone repairing these old sets needs to change these caps as they are always bad.<BR>Chuck<P>------------------<BR>chuck azar

Hi Guys,<P>I will look into adding these 6000V caps to our product line.<BR>Are these 6000V caps a "poly film" type? <P>Also, what pF/uF sizes would you like us to carry?<BR>Don't worry guys....if we get them in, you will not need to buy a hundred at a time.<P>Regards, Dave (of JustRadios) <A HREF="http://www.justradios.com/capacitors.html" TARGET=_blank>http://www.justradios.com/capacitors.html</A> <P>------------------<BR> <A HREF="http://www.justradios.com" TARGET=_blank>www.justradios.com</A>

THe caps I need were posted in the 1st posting. I called the ASC office in the US and they told me they would sell direct for a $ 500. min order and bill to a credit card. They might go lower. I talked to Ron Holman at 308-284-3611. let me know by phone, 215-794-3616, or email if you get some<BR>Chuck<P>------------------<BR>chuck azar

THe caps I need were posted in the 1st posting. I called the ASC office in the US and they told me they would sell direct for a $ 500. min order and bill to a credit card. They might go lower. I talked to Ron Holman at 308-284-3611. let me know by phone, 215-794-3616, or email if you get some<BR>Chuck<P>------------------<BR>chuck azar

Hi Chuck<P>Just visited the ASC website. ASC offer many different types ie film/foil and metalized. They also make from different poly films ie polyester and polypropylene. What "type and material" is best for TV application?<BR>Are .0047, .00047, .03, and .002 the only sizes needed for TV restorations...or are there other sizes needed (depending on the TV). Which sizes are needed most often?<P>One last question.....Can 6000V ceramic disc be used......or will only film type work?<P>Regards, Dave (of JustRadios) <A HREF="http://www.justradios.com/capacitors.html" TARGET=_blank>http://www.justradios.com/capacitors.html</A> <P>------------------<BR> <A HREF="http://www.justradios.com" TARGET=_blank>www.justradios.com</A>

Hi Dave. The caps I most freq. use are .001,.0047,.00047,in that order. The part no. is X675-.0047-10-6000. They all have the same part no. with the capacity as the middle numbers.Ceramic and micas will not work. They cause wierd problems in the horz sweep circuits. You could look up the circuit diagrams of all the old electrostatic TV sets to see which values are used in the horz. and vert. sweep coupling to the deflection plates and as bypass caps in the high voltage circuits.<BR>By the way I'm looking for a schematic for a Zenith G2951 or Sams set 95 folder 8.<BR>Thanks, <BR>Chuck <P>------------------<BR>chuck azar

Dave,<P>It turns out that the high voltage coupling caps for the electrostatic deflection plates in these sets is one application where the differences between capacitor types becomes terribly evident. Unlike a lot of the audio discussions where people have difficulty making a convincing case that there are differences, with these TVs, the difference is visually obvious, and not subtle.<P>Probably every one of us who works on these electrostatic TVs, when faced with the need to replace the coupling caps, tried ceramics the first time around (because it is easier to find ceramics available in the high voltages). But, wow! does it cause problems. The linearity of the scan gets all messed up. You can find quite a number of threads on this forum about the necessity to avoid ceramic caps in these applications.<P>My impression is that any type of poly cap will work as long as it has the 6000 V rating. I repaired mine before discovering this forum (hence my educational experience with ceramic caps -- there was no one to tell me otherwise...). I finally found something workable at a local surplus place -- some laser power supply capacitors.<P>The capacitance values suggested above look good to me. In my experience, the capacitance value doesn't matter much. I just used 0.005 uF for everything (both vertical and horizontal), and it seems to work fine. You might start with that value (if you end up having to buy a lot of inventory of each value) and add values if there are enough of us buying them.<P>Tom<P>------------------<BR>

Chuck:<P>Welcome to the forum. Good topic.<P>I can help with the Zenith schematic you need. If you still need it, send me an e-mail by clicking on the envelope icon.<P>------------------<BR>Tim

Hi Chuck and Tom,<P>Thanks for the information. Very interesting that only film type work well for this specific application .... although sounds like exact uF size not needed. I'll look in to possibility of adding a line of 6000V film caps ..... but will take some time. Getting in some more sizes of 630V film caps and a line of 1000V tubular axial film caps later this month, so am currently pretty busy re-working the web site for this addition. Next on agenda will be 6000V. Thanks again for your input.<P>Regards, Dave (of JustRadios) <A HREF="http://www.justradios.com/capacitors.html" TARGET=_blank>http://www.justradios.com/capacitors.html</A> <BR> <P>------------------<BR> <A HREF="http://www.justradios.com" TARGET=_blank>www.justradios.com</A>

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I've used high voltage disk caps with great sucess but only for the horizontal coupling on quite a few electrostatic sets. They work poorly as Vert. coupling caps and there will most definately be problems. Seems the disk caps work good at higher horiz. frequencies but not at the lower Vert. frequencies. I went around and around with the first electrostatic Emerson set I restored with these disk caps and finally settled on tubular H-V for the vert. and H-V disk for the horiz. coupling. The type of H-V disk cap that I used was 5/8 diameter and almost 1/2" thick!!<P> You might try Ra-Elco in Salt Lake City. I've bought alot of high voltage caps for electrostatic TV restoration there over the years. They are mainly surplus(but have some new) and so what they have on hand is what they have. Ask for Brian if you call there, he knows their H-V cap stock pretty well.<P><BR> Several years back they had mil-spec glass- oil filled .001 H-V caps that listed for over 80.00 at Newark or Allied for just 6.00 each. I used quite a number of those mil-spec caps in conjunction with a .005 20KV disk type they also stock in my sets here at home and none have failed. The .005 disk type subs in just fine for the old .0047 tubulars.<P> Sorry I don't know the phone number but they are listed if you call info.<P> I have a few .001 12KV TRW caps(new) and a few of the .005 20KV discs(used) that I could let go of if you're in a bind to get a project finished.<P>Mark<P>------------------<BR>

Thanks for all the help and a special thanks to David K who prompted me to retry Allied. They do have some items in stock but I had to insist they recheck after they told me again they didn't have any. Still it would be a good Idea for someone like Dave to stock these items because ALL electrostatic sets need at least 4 caps to repair these old sets. I have never seen one that had good caps in them.<BR>Thanks again,<BR>Chuck<P>------------------<BR>chuck azar