Re: {Collins} 75A2 opereration



I've actually had similar experiences with a Hallicrafter SX-101 and a Drake 
R-4A. I love self healing radios, hi, hi. :-)

Steve

J. Steven Cochrane W7JSC

----- Original Message ----- 
From: "Bob Stevens" <bob@xxxxxxxxxxxx>
To: <Collins@xxxxxxxxxxxxx>
Sent: Sunday, July 17, 2011 11:01 AM
Subject: Re: {Collins} 75A2 opereration


> Sometime ago, The ham club was donated from a SK's Estate an older xcvr 
> (not
> Collins). It transmitted fine, but the rcvr was so weak that you could put 
> a
> signal into it and put your ear up to the speaker with af and rf gains 
> wide
> open and hear it faintly in the background and tune across it, just as 
> John
> described. We tried checking the tubes (all within range) and voltages 
> (all
> ok) and cleaned and exercised all the variable controls and switches but 
> it
> just wouldn't come around. We were ready to give up and feed it to the
> dumpster and one of the guys took it home, put in his shack, and turned it
> on with the af gain down and left it (we had already determined that it
> probably wasn't going to explode). He came back several days later and it
> worked fine, We all puzzled over that result and no one has yet figured it
> out. The only times it had been on for up to 15 years was the few Saturday
> mornings when many of us get together at the clubhouse. The theories
> centered the reforming of something, a coupling condenser perhaps. While 
> all
> the advice you have gotten so far is excellent and probably, in the end,
> will yield you the result you desire, I would suggest that you also leave 
> it
> on (again assuming that your are not concerned about it catching fire or
> some other catastrophe) Can't hurt. Gud luck with the project, the A-lines
> are great rcvrs. 73, Bob K9ING
>
> -----Original Message-----
> From: Brian J. Henry [mailto:bhenry@xxxxxxxxx]
> Sent: Sunday, July 17, 2011 10:22 AM
> To: John King; Collins@xxxxxxxxxxxxx
> Subject: Re: {Collins} 75A2 opereration
>
> John,
>
> I don't know if this will help, but when I first acquired my 75A-3, I 
> found
> the small wires that connected the RF input to the input of the 80m-10m
> input transformer had burned up due to the application of high level RF to
> the receiver RF input.
>
> Brian Henry, WB6QED
>
> > -----Original Message-----
> > From: John King [mailto:k5pgw@xxxxxxxxx]
> > Sent: Sunday, July 17, 2011 7:24 AM
> > To: Collins@xxxxxxxxxxxxx
> > Subject: {Collins} 75A2 opereration
> >
> >
> > Thanks to Charlie, Darryl,Ted, and Steven for their email and 
> > suggestions.
> >
> > Since my first post, I have hooked a signal source (antenna
> > analyzer) to the coax connector on the 75A2 and have gotten a
> > faint signal through the receiver from the antenna analyzer. Not
> > enough signal to move the S meter, just audible as noise.
> >
> > The PTO seems to be working because I can tune across the signal
> > from the analyzer. All controls have an effect on the noise
> > coming from the speaker. The BFO doesn't impress me as working.
> >
> > Still looking. Thanks and 73, John, K5PGW
> > _______________________________________________
> > SHARE THE FUN: JOIN THE COLLINS COLLECTORS ASSOCIATION TODAY !
> > http://www.collinsradio.org/membership/
> >
> >  NETS: Tues & Thur: 3.805 MHz-2000 Central + Fri: 3.895 MHz-2000 Pacific
> >   SUNDAYS: 14.263 MHz-2000 UTC  +  AM Net: 29.050 MHz-1200 Central
> >   1st Wednesday AM Net 3.880 MHz-2000 local (ET, CT, MT, PT)
> >
> > The Collins Reflector reserves the right to refuse access to anyone.
> >
> > LIST HELP?  ADMIN EMAIL:  collins-owner@xxxxxxxxxxxxx
> > This ONLY goes to the list admins and does not post to the group!
>
> _______________________________________________
> SHARE THE FUN: JOIN THE COLLINS COLLECTORS ASSOCIATION TODAY !
> http://www.collinsradio.org/membership/
>
>  NETS: Tues & Thur: 3.805 MHz-2000 Central + Fri: 3.895 MHz-2000 Pacific
>   SUNDAYS: 14.263 MHz-2000 UTC  +  AM Net: 29.050 MHz-1200 Central
>   1st Wednesday AM Net 3.880 MHz-2000 local (ET, CT, MT, PT)
>
> The Collins Reflector reserves the right to refuse access to anyone.
>
> LIST HELP?  ADMIN EMAIL:  collins-owner@xxxxxxxxxxxxx
> This ONLY goes to the list admins and does not post to the group!
>
>
> _______________________________________________
> SHARE THE FUN: JOIN THE COLLINS COLLECTORS ASSOCIATION TODAY !
> http://www.collinsradio.org/membership/
>
>  NETS: Tues & Thur: 3.805 MHz-2000 Central + Fri: 3.895 MHz-2000 Pacific
>   SUNDAYS: 14.263 MHz-2000 UTC  +  AM Net: 29.050 MHz-1200 Central
>   1st Wednesday AM Net 3.880 MHz-2000 local (ET, CT, MT, PT)
>
> The Collins Reflector reserves the right to refuse access to anyone.
>
> LIST HELP?  ADMIN EMAIL:  collins-owner@xxxxxxxxxxxxx
> This ONLY goes to the list admins and does not post to the group!
> 






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