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Zenith Transoceonic H500
11/4/2009 6:22:12 PMJohn Jarratt
Hello Everyone: I have just started to restore this Transoceonic H500. I am using the schematic from this site. I am crosschecking the capacitors as layed out in the schematic and what I am seeing on the radio isn't the same as the schematic. I am not all the way through it yet but I have seen a couple so far that are not the same capacity rating as the schematic. C20 on the If tube is supposed to be .0047 uf but it is .047 uf in the radio. It doesnt look like it has been replaced at some point. Has anyone who has restored this radio come across anything similar? Thanks for any advice.
11/4/2009 6:32:08 PMJohnnysan
:Hello Everyone: I have just started to restore this Transoceonic H500. I am using the schematic from this site. I am crosschecking the capacitors as layed out in the schematic and what I am seeing on the radio isn't the same as the schematic. I am not all the way through it yet but I have seen a couple so far that are not the same capacity rating as the schematic. C20 on the If tube is supposed to be .0047 uf but it is .047 uf in the radio. It doesnt look like it has been replaced at some point. Has anyone who has restored this radio come across anything similar? Thanks for any advice.
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It's possible that you have a different version. What is the chassis number?
Johnnysan-
11/5/2009 8:15:04 AMJohn Jarratt
This is a H500 , serial #391456. I have 1 full schemtic and 1 partial that say they are for the H500 but they have different values for many components. The partial schematic may be the correct one but i am not sure. Itr is one this site. is there any way to get the entire page?::Hello Everyone: I have just started to restore this Transoceonic H500. I am using the schematic from this site. I am crosschecking the capacitors as layed out in the schematic and what I am seeing on the radio isn't the same as the schematic. I am not all the way through it yet but I have seen a couple so far that are not the same capacity rating as the schematic. C20 on the If tube is supposed to be .0047 uf but it is .047 uf in the radio. It doesnt look like it has been replaced at some point. Has anyone who has restored this radio come across anything similar? Thanks for any advice.
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:It's possible that you have a different version. What is the chassis number?
:Johnnysan-
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11/4/2009 7:28:52 PMEdd








Sir John. . . . .




I was more interested in seeing the actual FUNCTION of that C-20 capacitor and it shows to be a B+ and I.F. transformer decoupling capacitor for B+ side of the IF transformer and the IF transformers screen grid.


Either value should provide a low enough Z path to ground, of any stray IF frequency that might be present at that point. The advantage with the .05 value. Plus it is providing a quick ground path for High level IF signal, present on the plate side of that IF transformer,thru the B+ side, other wise it would be dependent upon flowing thru lossy B+ supply components.

The improvement of bypassing acton is particularly true if the unit is a disc ceramic type, versus a common foil type of capacitor.



73's de Edd













:Hello Everyone: I have just started to restore this Transoceonic H500. I am using the schematic from this site. I am crosschecking the capacitors as layed out in the schematic and what I am seeing on the radio isn't the same as the schematic. I am not all the way through it yet but I have seen a couple so far that are not the same capacity rating as the schematic. C20 on the If tube is supposed to be .0047 uf but it is .047 uf in the radio. It doesnt look like it has been replaced at some point. Has anyone who has restored this radio come across anything similar? Thanks for any advice.
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11/5/2009 12:42:21 AMLisa BAsson
Edd I was wondering if you ever made heads or tails out of the can I sent you..LBAsson If so give a email or something...Please Great thanks
11/4/2009 8:53:42 PMMarv Nuce
John,
Occassionally I've noticed drawings/lists that include a leading "0", but if the decimal is unseen or unprintable from an old schematic, the wrong value appears.

marv

:Hello Everyone: I have just started to restore this Transoceonic H500. I am using the schematic from this site. I am crosschecking the capacitors as layed out in the schematic and what I am seeing on the radio isn't the same as the schematic. I am not all the way through it yet but I have seen a couple so far that are not the same capacity rating as the schematic. C20 on the If tube is supposed to be .0047 uf but it is .047 uf in the radio. It doesnt look like it has been replaced at some point. Has anyone who has restored this radio come across anything similar? Thanks for any advice.
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11/5/2009 8:29:05 PMBill VA
:Hello Everyone: I have just started to restore this Transoceonic H500. I am using the schematic from this site. I am crosschecking the capacitors as layed out in the schematic and what I am seeing on the radio isn't the same as the schematic. I am not all the way through it yet but I have seen a couple so far that are not the same capacity rating as the schematic. C20 on the If tube is supposed to be .0047 uf but it is .047 uf in the radio. It doesnt look like it has been replaced at some point. Has anyone who has restored this radio come across anything similar? Thanks for any advice.
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Hi Johm,

C20 on the If tube is supposed to be .0047 uf but it is .047 uf in the radio.

I know no one has ever looked at the wrong physical part and get it mixed up with the schematic but the .047 is not the one on the RF 1U4, right? With that out of the way SAMS Set 152-12 covers Model H500 Chassis 5H40 and it is different from the Zenith/Riders Model H500 Chassis 5H40. Regardless tho the IF Decoupling cap is same, .0047 at 400 Volts. Now all that being said it's no telling what value part may be installed versus the schematic and no manfacturer is exempt from doing that as far as I know. I have had the ZTO's with .0047, don't recall any other value but did have a run of ZTO's with .0033 caps. And other part changes of course. What to do? I generally follow what was factory installed unless I know different for some reason. Most times it involves resistors and it's because I don't like the voltage readings. Of course I didn't know what Edd said so I may reconsider what I have in my ZTO. But here's some pictures of factory installed .0033 cap. Good luck with your ZTO.








11/5/2009 9:49:40 PMRon
:Hello Everyone: I have just started to restore this Transoceonic H500. I am using the schematic from this site. I am crosschecking the capacitors as layed out in the schematic and what I am seeing on the radio isn't the same as the schematic. I am not all the way through it yet but I have seen a couple so far that are not the same capacity rating as the schematic. C20 on the If tube is supposed to be .0047 uf but it is .047 uf in the radio. It doesnt look like it has been replaced at some point. Has anyone who has restored this radio come across anything similar? Thanks for any advice.
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I have a dumb question, how do you insert pictures here ?
11/6/2009 2:36:02 AMEdd






Sir Ron. . . . .




I think that maybe Sir Leslie was the last person to have made that query and here was the link below to that response, and my specific reply to him with its details.




If you only need the quickie info aspect, refer down to the colored text portions .




Click on me . . [X]. .('rat 'chere)





73's de Edd










Hello Everyone: I have just started to restore this Transoceonic H500. I am using the schematic from this site. I am crosschecking the capacitors as layed out in the schematic and what I am seeing on the radio isn't the same as the schematic. I am not all the way through it yet but I have seen a couple so far that are not the same capacity rating as the schematic. C20 on the If tube is supposed to be .0047 uf but it is .047 uf in the radio. It doesnt look like it has been replaced at some point. Has anyone who has restored this radio come across anything similar? Thanks for any advice.


I have a dumb question, how do you insert pictures here ?


11/6/2009 9:27:09 AMRon
Thanks, Edd


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:73's de Edd

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:Hello Everyone: I have just started to restore this Transoceonic H500. I am using the schematic from this site. I am crosschecking the capacitors as layed out in the schematic and what I am seeing on the radio isn't the same as the schematic. I am not all the way through it yet but I have seen a couple so far that are not the same capacity rating as the schematic. C20 on the If tube is supposed to be .0047 uf but it is .047 uf in the radio. It doesnt look like it has been replaced at some point. Has anyone who has restored this radio come across anything similar? Thanks for any advice.
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:I have a dumb question, how do you insert pictures here ?
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