[Kenwood] Kenwood TS-130S

[D Langston]

Are these the same lamp ratings used  for the TS-520/820?

73'

Dan
KO4RA
----- Original Message ----- 
From: "Clif Holland" <clif at avvid.com>
To: "Bryan Swadener" <bswadener at yahoo.com>; <kenwood at mailman.qth.net>
Sent: Monday, November 21, 2011 5:25 PM
Subject: Re: [Kenwood] Kenwood TS-130S


> 14v 80ma
>
> Clif Holland KA5IPF
> www.avvid.com
>
>
>
>
> ----- Original Message ----- 
> From: "Bryan Swadener" <bswadener at yahoo.com>
> To: <kenwood at mailman.qth.net>
> Sent: Monday, November 21, 2011 4:18 PM
> Subject: Re: [Kenwood] Kenwood TS-130S
>
>
> 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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