[Kenwood] Kenwood TS-130S

Thu Nov 24 11:02:38 EST 2011

All Electronics has 14V 45mA T-1 bulbs with 10" insulated wire leads @ 2 
for 1ドル.90 CAT# LP-6. Perfect for this application.
David
KW4DH
On 11/24/2011 10:47 AM, Steve wrote:
> At 07:58 AM 11/23/2011, D Langston wrote:
>> Are these the same lamp ratings used for the TS-520/820?
> Not the least bit critical. The easiest thing to do is remove the top
> cover, see the size of the bulb (maybe cut it out and take it with
> you for comparision), then go to Radio Shack and look through their
> stash. The only ones I've ever found at RS even close to the right
> size have been the ones with green or red dye on the bulb.
> Fortunately, the dye washes off very easily with rubbing alcohol.
>> Next, you really want to reduce the voltage to the bulb using a
> series resistor to prolong the life and reduce the heat generated by
> the bulb (so it doesn't burn the S-meter's case, for example).
> Usually, it takes something like a 43 or 51 ohm 1/2 watt resistor;
> choose the resistor so the bulb still provides adequate illumination,
> which ever place you're going to put it, in the S-meter or VFO.
> You'll find the voltage to the bulb will be something like 10.5 to
> 11.5 volts. As a side benefit, the resistor also provides some
> cushioning for the cold inrush current. Just use Ohm's Law to make
> sure you choose the power rating of the resistor properly so it
> doesn't burn up (measure the voltage across the resistor then
> calculate the power dissipated in the resistor). Also make certain
> the bulb does NOT touch the VFO dial or front of the S-meter, or it
> may eventually cause a burn spot.
>> Note that often, the filament in those el cheapo bulbs (relatively
> speaking) is usually offset inside the glass envelope; thus, you may
> have to rotate the envelope while watching the VFO dial or S-meter to
> find a position where the filament provides even and adequate
> illumination, then you may have to tape the bulb to keep it in that position.
>> SteveH, K0XP
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