Thank you for the reply, David.
Mike, I had understood the tone of your reply being due to the mood of a bad day (everybody has sometimes). That's why I did not reply to the first part of your message.
In any case, due to the fact that such lists are also a source of knowledge and friendship, I wanted to clarify that yes, music is only a hobby for me, my job is totally different and very hard (little time for hobbies). And yes, I do own a lot of vintage synths, very soughtafter and rare today, that I more often had bought for cheap when people used to go digital; and mostly were broken. So a desire arose inside me, I repaired them, giving a new life to real pieces of history.
Moreover, these machines are very often lent to real and very popular musicians here in Italy, absolutely for free. This is the background of my story, that's all. Sorry if I have annoyed somebody with my requests of help and many thanks to all who helped a newbie like me (eventually I succeded in restoring the beast - up to now... :-).
I think that, although many renowned pro-techs like you are in the mail list, the spirit of it is that such passions are feeded by sharing opinions, suggestions, jokes and helps between the subscribers. BTW, I have been on Analogue Heaven for more than15 yrs now and it is another "mother" list...
Ciao
Fernando
Il giorno 11/mag/2011, alle ore 03.46, Mike ha scritto:
> Sorry if I came off as abrasive yesterday... just about everything I was working on that could go wrong did. The bulbs posted on e-bay are rated for 10,000 hours at 14v A.C. by their manufacturer. As a general rule, when a bulb is fed D.C. at its rated voltage, it is expected to last half as long. The bulbs are military quality. All of the info you need is in the e-bay auction.
>
> http://cgi.ebay.com/Yamaha-CS-80-CS80-Preset-Incandescent-Bulbs-/320677774366
>
> I did the only test that I could with them without actually running them for 5,000 hours D.C. This test was fun. I found an equation stating that: "The life of a miniature lamp is inversely proportional to the 12th power of the applied voltage." So I figured, well, why not reverse the equation for longevity and cook em! Plugging into the above equation, I needed about 20.5 volts A.C. to get the things to burn out after 1% of their rated life. I hooked up my PSU and the samples that I had left in parallel. After 3 days and a few hours they were all done. (100 hours was the goal) I'm sure that there are other variables I didn't account for, but it was a fun test.
>
> Setting the fun aside, I've sold 4 sets so far and haven't received a complaint or even heard of a bulb burning out. Only one e-bay individual has left me feedback.
>
> I think they are reliable. I bought them from a very reputable manufacturer, am following their usage instructions, and did as much homework as I could.
>
> Personally, I think that it is best to replace all of them. After talking with a few folks, plus hearing heard horror stories of buttons melting and bleaching (probably from the wrong replacements), it doesn't seem like a bad idea. Furthermore, the originals are probably at the end of their life anyway. I also work on mixing consoles and it's not uncommon to see half of the bulbs burned out on a desk that hasn't been maintained since the 80's.
>
> http://launch.groups.yahoo.com/group/yamahacs80/message/2035
>
> I don't see how the originals could melt or bleach but there are a few similar sized bulbs out there that consume WAAYYY more current than the originals and run a lot hotter as well as brighter. My bulbs consume a third less current than the originals, run a lot cooler than the originals, and have the same lumen output as the originals.
>
> I hope that this answers your question.
>
> -Mike
>
> --- In yamahacs80@yahoogroups.com, Fernando Zarone <fernandozarone@...> wrote:
> >
> > Mike,
> > sincerely ) would buy the bulbs, but would like to know:
> > have they been tested for long time? i mean, are they reliable in the long run?
> > Is it convenient to replace all of them , although the original are still working?
> >
> > Last, how much do a complete set cost?
> > To Italy-
> >
>
>
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