OT: Struggling to find info - needing assistance

[Mike Miller]

OK.  It's been a few days since I asked for assistance, and I've 
received a whole slew of replies from a BUNCH of very helpful people 
here on the list, so it's time to turn loose with what's been found.

1.  The Graymark 505b transmitter appears to have been a kit used as an 
educational kit around the mid 70s.
2.  It appears to be a three-tube AM broadcast band transmitter with a 
replaceable coil.
3.  The circuit appears to be roughly equivalent to the Graymark 515, of 
which there is a schematic already available on the web.  It appears 
that the major difference is that the 515 was wired point to point, on a 
metal chassis, where the 505 was on a circuit board, without a chassis.
4.  Graymark will be willing to copy and snail-mail me a schematic and 
manual from their archives for a paltry $6.00, which is a very measly 
sum, compared to the "cost" of the time I'd spend going through it on my 
own (although the experience gained by doing it myself is always worth 
the time it takes)...I may take the time once the paperwork gets here 
though, just to verify that the suspicions from number 3 are in fact 
correct.

I do have to say that there's a lot of very good experience here on the 
list and a lot of very helpful individuals here who are very much 
appreciated.  In the many years I've had my license, I don't recall ever 
running across such a widespread and diverse collection of knowledge 
that spills into so many content areas.  I would like to thank everyone 
who assisted in each and every way, and let you all know that you are 
all very much appreciated.

       Very best of 73s to all!
             --Mike, KA9RQW

Mike Miller wrote:

> Hey all,
>    Having problems, and can't think of a more knowledgeable place to 
> turn for information-
>
>    In cleaning out my garage, I came across an old (and not yet 
> completed) kit I can't seem to find the instructions for or the tube 
> listing for.  It's a Graymark 505b transmitter, still in the original 
> (though very shopworn) box, with some of the original parts still 
> packaged inside.  It's partially assembled, and appears as though 
> someone has tried, although unsuccessfully, to apply power to it.  
> I've considered restoring it and completing it, since the board's not 
> going to be in pristine condition anyway, most likely, due to the 
> damage to it from the power applied (there may likely have been a 
> wiring error that caused it to arc when power was applied, I can't 
> tell without a schematic, but that would be my guess).
>
>    I'm looking for any information I can find for this 
> unit...schematics, parts list (though, obviously, I could generate 
> that from a schematic), assembly instructions, etc.  Any help or 
> assistance would be greatly appreciated.  I've already checked my 
> usuals (BAMA, eserviceinfo, mods.dk, and so forth) already, with no 
> luck, so those are exhausted.  I've also googled for what I would 
> consider the obvious (graymark, graymark 505, graymark 505b, graymark 
> transmitter), with no luck either.  Anyone got any other suggestions?
>
> Apologies for directions away from the green.  Thanks!!
>
>       --Mike, KA9RQW
>
>


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