[Kenwood] Kenwood TS-130S pots

[Mark Nace]

Does anyone know a source for the volume and mic gain pots for the TS-130S?  
Thanks and 73
Mark
N5KAE

 


----- Original Message ----
> From: David C. Hallam <dhallam at knology.net>
> To: Bryan Swadener <bswadener at yahoo.com>
> Cc: kenwood at mailman.qth.net
> Sent: Mon, November 21, 2011 6:34:00 PM
> Subject: Re: [Kenwood] Kenwood TS-130S
> 
> Bryan,
> 
> I have the bulbs as I replaced the one in the VFO.  How do you get to 
> it?  Is it easily accessible if I the off the bottom cover?
> 
> I just went in and removed the J5 jumper on the diodes that prevent 
> transmission to the WARC bands.  The diagrams in the manual were no help 
> in finding it.  I pushed wires around and found every jumper but J5.  
> After about 10 minutes or so, I finally found it.
> 
> David
> KW4DH
> 
> On 11/21/2011 5:18 PM, Bryan Swadener wrote:
> > David,
> >
> > They're just "Grain Of Wheat" lamps with a T1 (3mm diameter) bulb&  wire 
>leads.  IIRC, Kenwood used 14V/25mA lamps.  Your local hobby supply store should 
>have them.
> >
> > Their lifetime is determined by the supply voltage/current and the number of 
>times you cycle the power on/off.  Each increase of 5% voltage/current results 
>in a decrease of approximately 50% in lifetime.  Likewise, a decrease of 5% 
>voltage/current results in an increase of 50% in the lifetime.
> >
> > The number of times you cycle the power on/off has an effect as well.  
>Incandescent lamps have a low cold resistance.  This results in an inrush 
>current pulse of around 5X or more of the running current. This is a huge 
>mechanical shock to the filament and causes early failure.  Leaving it ON isn't 
>practical but you can limit the inrush current with a simple current source.  
>The LM317L voltage regulator works well, is easy to implement, and costs 
>pennies.  The LM317L datasheet shows how to use it as a current regulator, using 
>one resistor.  Since the 317 will drop around 1.25V, use it with a 12V lamp on a 
>14V source.  Mine's been working for many years... so far.
> >
> > vy 73,
> > Bryan WA7PRC
> >
> > From: David KW4DH
> > Subject: [Kenwood] Kenwood TS-130S
> > To: kenwood at mailman.qth.net
> >
> > Before I adventure inside the case of my TS-130S, is there a bulb to
> > illuminate the S meter?  I have gone back and forth over the schematic
> > but I can't seem to find any indication.
> >
> > David
> > KW4DH
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