[EICO] Eico 723 Low Grid Drive

Tue, 11 Mar 2003 00:38:46 -0500

Hi Richard,
I have two 722 VFO units, but before I did get both I ordered crystals
from Peterson Radio they make the z-17 holders that fit the crystal 
socket pins on both the 720 and 723 transmitters. Make sure you check
the manual for the frequencies required, some are fundamental and some
are
multiplied. They are very reasonable in price. I use the Peterson for
all
my crystal needs, even for receivers, and military gear. Sorry I never
has a yaesu vfo so I can't help you there.

As for the Eico vfo units I got them inoperative, only had to change one
tube in one and the filter cap in the other. Then did the alignment and
they both turned out to be quite accurate and stable. I even use them on
CW in addition to AM operation, my transmitters each have an Eico 730
modulator for AM. I get great reports in both modes. I would have to say
a DEFINITE fun set of equipments.

Jim
WB2FCN
http://eshop1.chem.buffalo.edu

richard wrote:
> 
> I have that same 723 from my novice days.  Does anyone have good ideas for
> finding crystals . . or  a VFO.  Now, I have an outboard VFO from my Yaesu
> 101E . . another great old radio.  Anyone have a schematic I could get a
> copy of of the Eico VFO to see if there were a way I could adapt my Yaesu
> VFO to work with it?  I know that one is a long shot, but I'd like to be
> able to use the old radio a little.  Those were good days sitting hunched
> over the key trying not to be too bad and hoping for a comeback.
> Thanks,
> Richard
> WB6LUJ
> 
> ----- Original Message -----
> From: "James M. Walker" <[email protected]>
> To: "Carl Strode" <[email protected]>; <[email protected]>
> Sent: Monday, March 10, 2003 5:42 AM
> Subject: Re: [EICO] Eico 723 Low Grid Drive
> 
> > Hi Carl,
> > and also list members, I have an Eico 723 I also use the 722 VFO with it.
> > As for the chirp, sounds like the 6CL6 screen resistor might be changing
> > value, and or, the filter caps/voltage divider network is not working,
> could
> > be dried out electrolytics. I would definitely check the voltage at the
> > screen
> > of the 6CL6. Do you have the manual, if not it is available at the
> B.A.M.A.
> > site under Eico. As for the low 15 meter drive I think you should check
> the
> > 15 meter grid input coil to the 6DQ6, make sure it isn't distorted or
> burned
> > open. Of prime consideration is the power supply components.
> >
> > If I can be of assistance just ask.
> > http://eshop1.chem.buffalo.edu
> > 73
> > Jim
> > WB2FCN
> >
> > ----- Original Message -----
> > From: "Carl Strode" <[email protected]>
> > To: <[email protected]>
> > Sent: Sunday, March 09, 2003 5:44 PM
> > Subject: [EICO] Eico 723 Low Grid Drive
> >
> >
> > > My Eico 723 has low grid drive only on 15 meters.
> > > Plenty of drive on 80, 40, 20 and 10.
> > >
> > > On 15, the max drive is only about 1.5 ma.
> > >
> > > If I hook up the 722 VFO, the drive is even less.
> > >
> > > I have not checked the 722 VFO yet, but since with any xtal, and even
> > > with the VFO the 15-meter grid drive is low, I am leaping to the
> > > conclusion that the 723 has a problem.
> > > The part that bugs me is that the drive on 10 seems to be great, only
> > > low on 15.
> > >
> > > I have not operated a 723 for over 25 years, and cannot recall how my
> > > original novice rig behaved.  I don't think I ever even saw a manual
> > > until recently.
> > >
> > > The 723 I now have puts out from 30 to 40 watts depending upon the band
> > > which seems to be about right for the rated input.
> > >
> > > Of course it chirps, with the chirp getting progressively worse from 80
> > > to 10.  15 seems to be the worst.
> > >
> > > Any suggestions?
> > > Please help.
> > >
> > > Also, when trying to neutralize the rig in accordance with the manual,
> > > adjustment of the neutralizing capacitor does not seem to have much, if
> > > any impact.  When watching the grid drive level on 20 meters and then
> > > adjusting the plate tuning, on the very slightest movement of the meter
> > > is noted, regardless of where the cap is set.  I have set it as best I
> > > can to a place that has the smallest of twitches, as opposed to a
> > > slightly larger "twitch".
> > >
> > > Carl WA7CS
> > > Pasco, WA
> > >
> > > [email protected]
> > >
> > > _______________________________________________
> > > EICO mailing list
> > > [email protected]
> > > http://mailman.qth.net/mailman/listinfo/eico
> > >
> >
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> >