Help required: Missing 0.1 ohm resistor. Can I use jumper cable?

Zimmer64

Zimmer64

New member
Hi there,

I am assembling my kit and am missing the 0.1 ohm 5w resistor that is used in den DC heater supply. What does this resistor do? Can I use a jumper wire until I have bought a replacement? All shops are closed in Switzerland until the 3rd.....

Thanks for your advice and happy New Year!

Michael
 
I assume you know if you contact replacementparts@bottlehead.com or phone Eileen they will send you a replacement.  If you want one quickly and cant source them locally then PM your address and i'll send you one as i have a few Dale .1ohm resistors here. Post from Ireland -> Switzerland should only take a day or two.

I'm not really sure as to its purpose but i think its more to limit startup current rather then smoothing the supply so i don't think it would be a good idea to bypass it with a jumper.
 
Thank you for the kind offer. I will try to get this resistor locally tomorrow. Finished the build this morning. Installed impedance switch and C4S. Resistance checks all ok. Just can't fire it up just yet  :'(

Cheers

Michael
 
what zimmer was asking was of course can he use a jumper--why a jumper-- well!!!  a jumper could have .1ohm resistance--zimmer measure a jumper and see
 
The added resistance adjusts the DC voltage to the heaters. (It has other benefits, not easy to summarize in a line or two.) The adjustment is small less than a half volt, so it won't damage the tubes to use a jumper for a few hundred hours. But don't leave it out for too long.
 
Michael,

I love to hear those stories.  Too often we only see problems on the board.  I believe the vast majority fire up first time and work as intended.
 
Yeah. I just took it slowly. Read a step in manual, attached the parts as instructed, checked against the photos in the manual and only then soldered if so instructed. After each section I took high resolution photos and checked the solder joints on my iPad (magnified). That process really minimizes the chance of errors, plus gives you a nice documentation of your work.

Michael
 
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Slow and meticulous beats fast and sloppy any day.  I wouldn't expect you to be sloppy either.

But so many first kit builders are in a hurry and have no idea how to make a good, solid solder joint.
 
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