[Heath] Heath Digest, Vol 94, Issue 14

Wed Oct 31 22:30:07 EDT 2018

Rich,
The first time I read you post, I thought that the neutralization might be
off.  As you approach full power, the PA may go into oscillation making full
power and wide bandwidth.  That would draw lot's of current.  It is also
possible that one of the tubes in the PA could be defective.  At high power
it might just arc over internally.
Al
WB9UVJ

-----Original Message-----
From: Heath [mailto:heath-bounces at puck.nether.net] On Behalf Of
heath-request at puck.nether.net
Sent: Wednesday, October 31, 2018 7:20 AM
To: heath at puck.nether.net
Subject: Heath Digest, Vol 94, Issue 14

Send Heath mailing list submissions to
	heath at puck.nether.net

To subscribe or unsubscribe via the World Wide Web, visit
	https://puck.nether.net/mailman/listinfo/heath
or, via email, send a message with subject or body 'help' to
	heath-request at puck.nether.net

You can reach the person managing the list at
	heath-owner at puck.nether.net

When replying, please edit your Subject line so it is more specific than
"Re: Contents of Heath digest..."

Today's Topics:

   1. RTO Status And My SB-102 (Rich Sahlender)
   2. Re: RTO Status And My SB-102 (James Owen)
   3. Re: RTO Status And My SB-102 (JOHN BIRDLEBOUGH)
   4. Re: RTO Status And My SB-102 (Bob G3OOU)

----------------------------------------------------------------------

Message: 1
Date: Tue, 30 Oct 2018 19:08:19 -0400
From: Rich Sahlender <wa3wlh at comcast.net>
To: Heath <heath at puck.nether.net>
Subject: [Heath] RTO Status And My SB-102
Message-ID: <20181030230819.GA13292 at born3.midworld.org>
Content-Type: text/plain; charset=us-ascii

I thought there may be others on the list that woulod want to know this.

I received an email from RTO that they are cancelling all service requests
on the waiting list. They will complete service on what they have received
thus far but if you were waiting for the "go ahead and ship" as I was...
well... the notification will not be coming.

Some years ago I bought a SB-102 from someone on this list. It has been on
the shelf waiting for me to get around to restoring it since. I have been
working on so much other old gear I just never seem to get around to the 102
so figured I'd give RTO a try. I am disappointed of course but understand
that RTO has done a lot of good work for us over the years although I have
not had an occasion to use their services until now. I am sure they will be
missed.

With regards to my 102 I have it receiving on all bands. It seems sensitive
enough but there is an issue that I expect is related to the LMO. From the
low end of each band to the middle the receive is very stable. From the
middle to the high end it is for lack of a better word "warbly". Any
suggestions on what this might be other than the LMO?

Xmit also works with low drive. I imagine it also work with higher drive but
every time I crank it up above 90 watts or so while in tune it blows the
fuse in the Hp-23. I rebuilt the HP-23 with one of the boards from Harbach
but the old circuit breaker was toast so I replaced that with a fuse holder.
I don't recall if I had 3 or 5 amp fuses in there while tuning the 102 and
blowing several fuses in the process. I figured this was something else that
RTO would handle after fixing the "warbly"
receive.

Anyway any suggestions appreciated. I am not really up for messing with the
internals of the LMO so if the concensus on the warbly receive is to tear
into the LMO I may just offer it up here to someone more capable than I or
as a parts unit etc...

Tnx es 73 de Rich WA3WLH

------------------------------

Message: 2
Date: Tue, 30 Oct 2018 23:58:08 +0000 (UTC)
From: James Owen <k4cgy at yahoo.com>
To: Rich Sahlender <wa3wlh at comcast.net>, Heath <heath at puck.nether.net>
Subject: Re: [Heath] RTO Status And My SB-102
Message-ID: <215143393.19483333.1540943888356 at mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"

HI Rick,??? Sorry to hear that RTO is likely closing their doors.? The SB/HW
series of Heathkit is pretty simple to repair and keep going as almost
anyone with a little troubleshooting experience can usually fix them.? The
problem you cite, a warble is likely what you suggest the VFO.? I have never
worked on the SB-102 VFO but have repaired several? TRW VFO's in the
SB-100/101.? The usual problem has been intermittent contact between the
capacitor rotor and ground.? I think what happens is that some oxide builds
up on the moving bearing contacts possible due to dried up lub and or lack
of use.? I found that a length of braid connected from the rotor to ground
cured the problem with the TRW VFO's.? 
?? Now as to the fuse blowing problem.? The fuse in my HP-23 is 3 amp and
likely the circuit breaker is the same.? I have seldom blown a fuse when
tuning to maximum output which on my HW-100 and SB-101 runs about 110 watts.
It would take some current measurements to determine the problem but
something is causing an excess load on the primary. Look for a bad contact
on the fuse holder which is in the plug on the HP23 as excess heat can cause
the fuse to blow.? Don't know what else to tell you except if you can borrow
another power supply you could determine if it's in the transceiver or power
supply.
73 Jim?James C. Owen, III K4CGY

      From: Rich Sahlender <wa3wlh at comcast.net>
 To: Heath <heath at puck.nether.net>
 Sent: Tuesday, October 30, 2018 7:16 PM
 Subject: [Heath] RTO Status And My SB-102

I thought there may be others on the list that woulod want to know this.

I received an email from RTO that they are cancelling all service requests
on the waiting list. They will complete service on what they have received
thus far but if you were waiting for the "go ahead and ship" as I was...
well... the notification will not be coming.

Some years ago I bought a SB-102 from someone on this list. It has been on
the shelf waiting for me to get around to restoring it since. I have been
working on so much other old gear I just never seem to get around to the 102
so figured I'd give RTO a try. I am disappointed of course but understand
that RTO has done a lot of good work for us over the years although I have
not had an occasion to use their services until now. I am sure they will be
missed.

With regards to my 102 I have it receiving on all bands. It seems sensitive
enough but there is an issue that I expect is related to the LMO. From the
low end of each band to the middle the receive is very stable. From the
middle to the high end it is for lack of a better word "warbly". Any
suggestions on what this might be other than the LMO?

Xmit also works with low drive. I imagine it also work with higher drive but
every time I crank it up above 90 watts or so while in tune it blows the
fuse in the Hp-23. I rebuilt the HP-23 with one of the boards from Harbach
but the old circuit breaker was toast so I replaced that with a fuse holder.
I don't recall if I had 3 or 5 amp fuses in there while tuning the 102 and
blowing several fuses in the process. I figured this was something else that
RTO would handle after fixing the "warbly"
receive.

Anyway any suggestions appreciated. I am not really up for messing with the
internals of the LMO so if the concensus on the warbly receive is to tear
into the LMO I may just offer it up here to someone more capable than I or
as a parts unit etc...

Tnx es 73 de Rich WA3WLH
_______________________________________________
Heath mailing list
Heath at puck.nether.net
https://puck.nether.net/mailman/listinfo/heath

-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<https://puck.nether.net/pipermail/heath/attachments/20181030/b8c32cda/attac
hment-0001.html>

------------------------------

Message: 3
Date: Wed, 31 Oct 2018 01:24:15 +0000
From: JOHN BIRDLEBOUGH <jbirdlebough at msn.com>
To: Rich Sahlender <wa3wlh at comcast.net>, Heath <heath at puck.nether.net>
Subject: Re: [Heath] RTO Status And My SB-102
Message-ID:

Content-Type: text/plain; charset="us-ascii"

More likely than LMO is the alignment is off SB-102 radios drift off because
of component aging.  I replaced all my resistors and caps, with MOF and
silver mica.  Now radio is rock solid, once it was realigned.  Worst problem
to fix in SB-10X is the mechanical dial slipping problem.  And cracked
dials.  Rest is repairable.  I normally do linears but a few SB-10X,
Collins, Hammarlund transceivers end up on my bench.

Sounds fixable.

73's K7BIT

-----Original Message-----
From: Heath <heath-bounces at puck.nether.net> On Behalf Of Rich Sahlender
Sent: Tuesday, October 30, 2018 4:08 PM
To: Heath <heath at puck.nether.net>
Subject: [Heath] RTO Status And My SB-102

I thought there may be others on the list that woulod want to know this.

I received an email from RTO that they are cancelling all service requests
on the waiting list. They will complete service on what they have received
thus far but if you were waiting for the "go ahead and ship" as I was...
well... the notification will not be coming.

Some years ago I bought a SB-102 from someone on this list. It has been on
the shelf waiting for me to get around to restoring it since. I have been
working on so much other old gear I just never seem to get around to the 102
so figured I'd give RTO a try. I am disappointed of course but understand
that RTO has done a lot of good work for us over the years although I have
not had an occasion to use their services until now. I am sure they will be
missed.

With regards to my 102 I have it receiving on all bands. It seems sensitive
enough but there is an issue that I expect is related to the LMO. From the
low end of each band to the middle the receive is very stable. From the
middle to the high end it is for lack of a better word "warbly". Any
suggestions on what this might be other than the LMO?

Xmit also works with low drive. I imagine it also work with higher drive but
every time I crank it up above 90 watts or so while in tune it blows the
fuse in the Hp-23. I rebuilt the HP-23 with one of the boards from Harbach
but the old circuit breaker was toast so I replaced that with a fuse holder.
I don't recall if I had 3 or 5 amp fuses in there while tuning the 102 and
blowing several fuses in the process. I figured this was something else that
RTO would handle after fixing the "warbly"
receive.

Anyway any suggestions appreciated. I am not really up for messing with the
internals of the LMO so if the concensus on the warbly receive is to tear
into the LMO I may just offer it up here to someone more capable than I or
as a parts unit etc...

Tnx es 73 de Rich WA3WLH
_______________________________________________
Heath mailing list
Heath at puck.nether.net
https://puck.nether.net/mailman/listinfo/heath

------------------------------

Message: 4
Date: Wed, 31 Oct 2018 08:17:28 +0000
From: Bob G3OOU <g3oou at aol.com>
To: Rich Sahlender <wa3wlh at comcast.net>, Heath <heath at puck.nether.net>
Subject: Re: [Heath] RTO Status And My SB-102
Message-ID: <6653a8b8-a669-f14d-3cb8-e7dc10830267 at aol.com>
Content-Type: text/plain; charset=utf-8; format=flowed

Hi Rich

Your LMO problem is almsot certainly due to the lubrucant having dried out
on the rotor contact and capacitor bearings inside the LMO. This is
relatively easy to fix but requires some patience to remove the LMO from the
chassis. You will need to slacken the front panel and remove the main tuning
control and its friction connection to the dial assembly. 
Best to study the user manual and various documents that have been published
on this topic before commencing work.

73

Bob

Bob F Burns G3OOU, G-QRP 6907, @BobFBurns Crystal Palace Radio & Electronics
Club: http://cprec.btck.co.uk/ Technical web site: www.qsl.net/g3oou

On 30/10/2018 23:08, Rich Sahlender wrote:
> I thought there may be others on the list that woulod want to know this.
>
> I received an email from RTO that they are cancelling all service 
> requests on the waiting list. They will complete service on what they 
> have received thus far but if you were waiting for the "go ahead and 
> ship" as I was... well... the notification will not be coming.
>
> Some years ago I bought a SB-102 from someone on this list. It has 
> been on the shelf waiting for me to get around to restoring it since. 
> I have been working on so much other old gear I just never seem to get 
> around to the 102 so figured I'd give RTO a try. I am disappointed of 
> course but understand that RTO has done a lot of good work for us over 
> the years although I have not had an occasion to use their services 
> until now. I am sure they will be missed.
>
> With regards to my 102 I have it receiving on all bands. It seems 
> sensitive enough but there is an issue that I expect is related to the 
> LMO. From the low end of each band to the middle the receive is very 
> stable. From the middle to the high end it is for lack of a better 
> word "warbly". Any suggestions on what this might be other than the LMO?
>
> Xmit also works with low drive. I imagine it also work with higher 
> drive but every time I crank it up above 90 watts or so while in tune 
> it blows the fuse in the Hp-23. I rebuilt the HP-23 with one of the 
> boards from Harbach but the old circuit breaker was toast so I 
> replaced that with a fuse holder. I don't recall if I had 3 or 5 amp 
> fuses in there while tuning the 102 and blowing several fuses in the 
> process. I figured this was something else that RTO would handle after
fixing the "warbly"
> receive.
>
> Anyway any suggestions appreciated. I am not really up for messing 
> with the internals of the LMO so if the concensus on the warbly 
> receive is to tear into the LMO I may just offer it up here to someone 
> more capable than I or as a parts unit etc...
>
> Tnx es 73 de Rich WA3WLH
> _______________________________________________
> Heath mailing list
> Heath at puck.nether.net
> https://puck.nether.net/mailman/listinfo/heath

------------------------------

Subject: Digest Footer

_______________________________________________
Heath mailing list
Heath at puck.nether.net
https://puck.nether.net/mailman/listinfo/heath

------------------------------

End of Heath Digest, Vol 94, Issue 14
*************************************