Hi Tim. You don't say whether your Viking II is stock or whether you or someone else has modified the speech amp to allow for transmission of a wider range of audio frequencies. A stock Viking II has a rather limited audio range and the response drops off rapidly above 3000 Hz and below 800 Hz (I'm going from memory on these figures but I believe they're in the ballpark). What I'm driving at is that using an EQ with a stock Viking II might not produce the results you are hoping for.
If you'd like to widen the audio response of your transmitter's speech amplifier, take a look at the audio mods for the Viking II, two examples of which can be found on the AM Window Tech page under Modifications. Here's the URL:
http://www.amwindow.org/tech/htm/mods.htmAnother way to get a Viking II producing wide audio is to bypass the speech amp completely and feed balanced audio to the grids of the 807 modulators through an line to grid audio transformer. Ken, W2DTC does this with his Viking II and Bill KC2IFR does it with his Valiant, just to cite two examples you can hear on the bands here on the east coast. The audio produced by these two gents is fabulous and the direct feed probably produces the best results. Getting a transformer that will do the job is the trick. The Hammond 841 fits the bill, but last I looked I think it ran somewhere around $75-80 new and was a special order. You can do some research and get the figures you'll need to do the mod and then start searching for a transformer.
If you really want to delve into the audio mods and different problems inherent to some of the stock components in the Viking II, they have been discussed in articles that appeared some time back in Electric Radio. You can check the ER website for info about an independent website that features a searchable index of back issues of Electric Radio. There's a link to ER's website from the main index page of the AM Forum and you can purchase the back issues directly from ER.
Good luck and enjoy the Viker II!
Additional notes:
Paul, VE7KHZ has a website that includes some info about his mods to a Viking II. He used the audio to modulator grids method and he discusses what he did and shares some photos. Here's the URL to the page on Paul's website that shows his Viking II audio mods.
http://www.qsl.net/ve7khz/VikingII.htmlHighly recommended too are articles on the AM Fone "East Coast Sound" page, including Mike W2ZE's excellent introduction to audio entitled "Processing 101". Here's the URL:
http://amfone.net/ECSound/index.htm