The AM Forum

Hi All, well I am back working on old  radios. I have a sp 600 jx17 that was dropped off as a basket case.got it receiving so far. a lot of tube replacement so far but that's expected Had very low audio so I installed a 600ohm transformer to 8ohm  but still low audio. some site said to replace the 2 audio coupling capacitors with ones twice their value.But I am not to bright on reading schematics so where might they be. a picture would be appreciated Thanks Much. O by the way I got the viking 1 and the viking 1&1/2 working fine with all the help from this form  RED  N9GHE

There are two excellent documents you should purchase if you are going to get that receiver back in working condition.   They will have the answer to virtually any and all technical questions you will ever have regarding the SP-600. 

First the military TM-11-851, available as a down load AVAILABLE HERE (http://www.jamminpower.com/main/sp600.html) as a down load at the bottom of the page, or you can get a print copy, which I highly recommend, on Ebay.   The second is "The Anthology Of Technical References For The Hammarlund SP 600 And Its Variants".   These two documents will make you a virtual expert by the time you've finished reading them.   

I recommend you put the radio back to "stock" condition, then proceed with incorporating those modifications you consider necessary.   

HERE ARE PICS (https://mikeharrison.smugmug.com/HAMMARLLUND/SP600) of my refurb process from a couple years ago.

Thank you Mike.
just picked one up a few weeks ago. Got to finish the move and then hope to play with it.
73
Carl
WA1KPD