I too have some old gear, some Drakes that are ~35 years old and two Johnson Rangers that are ~50 years old.  I would normally side with Ton w8ji, but not this time.  Replace all the electrolytic capacitors, there aren't that many, they are cheap, and most likely the radio will work better.  It just isn't worth it to take a chance on damaging your valuable radios.  It can be a pain in the butt to trouble shoot them.  The old electrolytic capacitors are most likely out of spec and will just cause problems down the road.  I would install a fuse as mentioned as added protection.  Also I would change the power cords to ether a two prong polarized plug or a three wire plug.  Make sure that the fuse goes in the hot lead.  

My Drake R-4B receiver for example uses only nine electrolytic capacitors.  Not a big deal money wise or time wise to replace.  In being a member of several old radio web groups I feel safe in saying electrolytic capacitors, tubes and resistors that have gone high in value cause the most problems.  The electrolytic capacitors once replaced should be good for another 25 years.  Todays electrolytic capacitors are much better made than the old paper caps and you can upgrade some to give you a little better performance.  I would do a visual inspection of the old carbon resistors.  If they are cracked or look like they have been baked in an oven I would replace them too.  There may be some resistors that were originally install that are underrated and could use a higher wattage resistor.  I would try and find a web group for each of your old radios and see what the other guys have had to do to their gear to keep it working well.  Most of these groups have someone that is very knowledgeable and welling to give you some good advise.  Good luck.

Al, n7ioh

Jamie, as was mentioned earlier, look at the Par end-fed half wave antennas.  I know what your landlord said, but even with your dipole you are going to have a feed line.  The feed line of your dipole even if you use RG58 will be MUCH larger than the Par antenna which I believe is only about 1/8" in diameter.  The Par 20 meter end-fed is only 33 feet long.  It would be more stealthy then the dipoles you are thinking of making and work MUCH better.  The 20 meter Par antenna has a 300 KHz bandwidth and comes in a 100 watt or a 300 watt unit.  Take a look at the Par antenna, link.
http://www.parelectronics.com/end_fedz.htm
Then show the photos to him and see if he will reconsider  the no wire antenna.

Here is a link to the eham reviews where Par has a 5 out of 5 with 192 reviews.  Some have even used his antennas inside their homes with great results.
 http://www.eham.net/reviews/detail/3632

While the dipole you are thinking of making will work, 20 meters is a tuff band for those with poor signals and antenna that can't hear.

Al, n7ioh

I like WA7CC's idea of contacting the owner and trying to locate the problem.  It may be a simple fix that will eliminate the RFI for others too.  If you can go there with a HT or cell phone so you can stay in contact with the other ham while he is on 10 meters and getting the RFI it should be easy to isolate.  I would try turning off and on different switches or circuit breakers and see if it goes away.  It is possible there is more then one item causing the RFI so switching off the main breaker to the shop would, killing all power would tell you for sure if the RFI is coming from there.  You may be able to do this before he opens or after he closes so it won't affect his business.  

Al, n7ioh

Actually it's NOT 50 watts PEP, it's 50 watts ERP.

Al n7ioh

You may want to join AMPhone.  These guys have been a lot of help to me and I think they have seen and done just about everything when it comes to these old radios.

http://amfone.net/Amforum/index.php

Al, n7ioh

Drake out of business, not hardly.  R. L. Drake is still in business and going strong.  Here is there link, http://www.rldrake.com/

Al, n7ioh

I just opened up my CSS-1 and looked at C24 but could not find any markings on it.  I also looked at the papers that came with mine and no parts list or schematic.  I would suggest contacting Am-Con Inc. at 1-406-844-3052 in Lakeside, MT or email them at amcom@digisys.net and see if they will help you.  

Al n7ioh

Hi Russ, Tom N1TQ just sold one last month here on eHam.  You might contact Tom to see who bought it and if you can get a copy of the manual from the new owner.  Tom's email is, n1tq@charter.net

I often look to see if someone has the item for sale that I need information about and then try to contact them, even on ebay.  

Al, n7ioh

Here is a link to one of my searches showing a connection.
http://www.google.com/#hl=en&safe=off&num=100&q=%22INTERNATIONAL+MARINE+RADIO+COMPANY%22R700m&aq=&aqi=&aq=&aqi=&aq=f&aqi=&oq=&fp=58a729af4b6714f0

Here is the other thing I found that shows the connection between ITT and International Marine Radio Company.

[PDF]
The Ultimate Quick Reference Guide
File Format: PDF/Adobe Acrobat - View as HTML
International Marine Radio Company. (IMRC), a subsidiary of STC (part of ITT) supplied many shipping lines (Including the famous 'Cunard') with radio ...

Al, n7ioh

I have done some searching and have not found much.  Can you provide some more information about the radio?  Do you know when it was made?  Is it a valve radio?  Is there any other information on the radio or inside that might help us to identify it?  

From what little I have been able to find it looks like other companies made radios for ITT.  One of these companies was, International Marine Radio Company.  It's possible we may have to look at other radio companies to find your radio.  

Al, n7ioh

They also made two antennas that covered 10, 15, 20 and 40 meters only.

Model HF4V-II, HF Vertical antenna covering 10, 15, 20, and 40 meters produced from 1978 to 1981

http://www.bencher.com/pdfs/00409IZV.pdf

Model HF4V-S, HF Vertical antenna covering 10, 15, 20, and 40 meters - 14 ft produced from 1978 to 1981

http://www.bencher.com/pdfs/00811IZV.pdf

Al, n7ioh

There were 3 pre warc antennas that were made about that time. here is the information and links to the manuals so you can check the tube sizes.

Model HF5V-II, HF Vertical antenna covering 10, 15, 20, 40 and 80 meters produced from 1977 to 1979

http://www.bencher.com/pdfs/00813IZV.pdf

Model HF5V-III, HF Vertical antenna covering 10, 15, 20, 40 and 80 meters produced from 1979 to 1981

http://www.bencher.com/pdfs/00464IZV.pdf

Model HF5V-S, HF Vertical antenna covering 10, 15, 20, 40 and 80 meters - 16 ft produced from 1978 to 1981

http://www.bencher.com/pdfs/00463IZV.pdf

Take a look at these manuals and see which manual shows your antenna.

Al, n7ioh

Here is a link to the Bencher website where you can download all the different antenna manuals and find out which one you have.  

http://www.bencher.com/pdf_download.html

I have the HF6V-X which was their export antenna so the tubing sections were cut shorter for international shipping.  I also have their regular HF6V but their were little differences made over the years.   There are eight HF5... and HF6... antennas and two HF9... antennas listed.

Al, n7ioh

I was going to install MOV's (metal oxide varistor) in the AC input line of some of my radio gear.  I was told that the MOV's have some problems and I should use Transorbs (TVS Diodes) or equivalent instead.  I looked at Mouser's website and there are hundreds to choose from.  I need some help in selecting the correct ones for my gear.  My gear, Drake T-4XC, TR-6, R-4B, AC-4, Johnson Viking Ranger II, Astron RS-70M, Ameritron AL-1500(240VAC), and JRC JST-245.  Mouser's link below to the TVS Diodes page.
http://www.mouser.com/Search/Refine.aspx?N=254140&Keyword=tvs&FS=True

I know that most if not all the new ham radios have protection at the antenna input to the radio.  Because much of my gear is older I would like to add this device to them.  What is it that I should be adding and does Mouser have them, (part number please)?  I am guessing it goes from the center pin to ground.  

Thanks, Al n7ioh

Sorry to here about your loss.

You might try joining AMPhone, here is the link to sign up.
http://amfone.net/Amforum/index.php?action=help;page=registering

They are a great bunch of guys and gals.  They have a classified section and technical section for just about everything.  I am sure that old radio will need some work and it is very likely someone in the group has that radio.

Al, n7ioh