[AMRadio] DX-100B, output falls off gradually

[Phil LaMarche]

Tubes reboxed in the original RF Parts box.  Replaced the peanuts with
bubble wrap.  Will be mailed tomorrow.  Invoice is in the box from RF Parts.

Phil

Philip LaMarche
 
LaMarche Enterprises, Inc

Phil at LaMarcheEnterprises.com
www.LaMarcheEnterprises.com  
 
727-944-3226
727-937-8834 Fax
727-510-5038 Cell 
 www.w9dvm.com
K3 # 1605
KPA500 # 029
P3 #1480

 CCA 98-00827
CRA 1701
W9DVM
 


-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Rick Poole
Sent: Sunday, November 20, 2011 1:01 PM
To: amradio at mailman.qth.net
Subject: Re: [AMRadio] DX-100B, output falls off gradually

At 12:42 PM 11/20/2011, Gary Schafer wrote:

 >>>>>
>The fact that you say pin 1 of the rear jack is at ground no matter 
>where the mode switch is would point to:
>Someone placing an internal jumper across pin 1 to ground.
<<<<<

It appears that is what happened... more specifically, someone apparently
placed a jumper across the Plate switch so that the VFO and buffer cathodes
are always grounded.

Turns out this is part of the rework of the DX-100B so that it will work
with the SB-10, at least according to one of the illustrations in the SB-10
manual.  I haven't figured out why, yet.  But regardless, I'm not going to
be using the SB-10 anyway, at least not any time soon, so I'm going to
remove that jumper and maybe substitute an internal switch until I figure
out why the jumper is there to begin with.

It's going to be a couple of days before I can wrestle that big block of
iron over to the workbench... having an arthritis attack so it's all I can
do just to walk... and anyway I just blew up one of the modulator tubes (it
developed an internal short) so I need to wait for a replacement to show up
at my door before I can take this little project any further.

Rick WA1RKT

______________________________________________________________
Our Main Website: http://www.amfone.net
AMRadio mailing list
Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
List Rules (must read!): http://w5ami.net/amradiofaq.html List Home:
http://mailman.qth.net/mailman/listinfo/amradio
Post: AMRadio at mailman.qth.net
To unsubscribe, send an email to amradio-request at mailman.qth.net with the
word unsubscribe in the message body.

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html