Tuning problem in SB-101

[Bob Burns]

In a message dated 04/09/2008 15:37:44 GMT Standard Time,  
kgordon2006 at verizon.net writes:

I can't  remember whether or not those tagged-washers are inside the 
LMO or outside  of it. If they are outside, I think I can get them freed up 
with some  solvent.. But I will still have to drop the front  panel.





Hi Ken
 
The bad news is that the tagged washers are inside the VFO housing close to  
the front wall. You will need to clean the old goo off before replacing it 
with  some sort of grease. Once the VFO assembly is removed, you can take off one 
side  panel to gain access to the interior but not the side holding the VFO 
tuning  capacitor. Modern general purpose thin oils are not suitable as they 
are fairly  volatile and also creep / migrate across the oiled component.
 
Someone else on the list may be able to advise on a suitable grease?
 
Suggest that you clean and regrease the main variable capacitor  bearings and 
earthing sliders - I have had some of those behave erratically  because of 
dried grease. Also check that the valve holder connections to  the valve pins in 
the rest of the SB101 are still sound. I have had some of  these socket 
connections get very sloppy over the years, particularly the AF  output valve which 
actually fell out when I turned the rig upside down. You can  (carefully) 
tighten them a little with a sharp pointed tool like a scriber,  otherwise change 
the valveholder.
 
I wonder how many of the modern black box rigs will still be going strong  in 
40 years?
 
73

Bob 

G3OOU
G-QRP  6907
_http://members.aol.com/rfcburns_ (http://members.aol.com/rfcburns) 



   

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