[R-390] Restoration questions

[Barry]

That last detente is for an optional squelch circuit.

Sounds like the IF gain needs to be adjusted.  It's easy to set it too "hot".  There should be info in the manual for setting it.

Congrats on getting it refurbed.
Barry - N4BUQ

----- Original Message -----
> From: "Johnsay Johnsay" <groundwave at yahoo.com>
> To: r-390 at mailman.qth.net
> Sent: Thursday, June 20, 2013 7:19:34 AM
> Subject: [R-390] Restoration questions
> 
> Hi All:
> I'm currently in the process of refurbishing a '58 vintage Motorola
> with an EAC IF strip.
> I've finished cleaning it up and going over the mechanicals.  So far
> I'm well pleased as it's quite sensitive and mostly everything seems
> to be working fairly well.
> On this  unit I've noticed that the function switch has an unmarked,
>  extra detente beyond "CAL".  Functionally it behaves like MGC.
>   Wattup wid dat?  Secondly this unit seems to have a surplus of gain
> and readily overloads unless one rides the RF gain.  It's
> particularly annoying on CW.  Is this normal or an issue?
> Other than a rough check of the front end  and checking tubes I
> really haven't gone through an alignment.  So far I've checked tubes
> in the if strip and replaced C503.
> BTW, thanks to those who assembled the Y2K manual,  what a resource!
> John,  W8KX
> ______________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:R-390 at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>