[R-390] New toy.

[Bob Camp]

Hi

If you do decide to replace them I would recommend using 5 watt wire 
wound resistors. They are small enough to fit and they will pretty much 
last forever.

The only real issue is if the resistors are imbalanced. That will put 
an unequal load on the 6082's. Unequal load burns out the tubes a bit 
faster. Of course without matched pairs of tubes I doubt the currents 
are balanced to anything better than 10 or 20% even with exact 
resistors.

The whole issue of tolerance on carbon comp resistors has kept a number 
of threads going here for quite a while. Needless to say it's a "hot" 
topic. A lot of the parts were 20% when new. There is more than a 
little data that even when new they spread out over the entire range 
....

	Take Care

		Bob Camp
		KB8TQ

On Feb 7, 2005, at 8:29 PM, Llgpt at aol.com wrote:

>
> In a message dated 2/7/2005 5:46:18 PM Central Standard Time,
> redmenaced at yahoo.com writes:
>
> Charring  under the 6082's, well, not really charring,
> just black heat-type  dirt.  I guess you could call it
> smoke marks.  Checking the  resistors now.  Is that
> first band supposed to be yellow?  Or  what?  I measure
> the four at 41.8 for R615, 44.0 for R620, 40.8  for
> R621, and 50.8 for the last one I can't see the  number
> on.
>
> Most tubes tested good.
>
>
>
> 47 Ohms Joe, replace ALL of them.
>
> Les
> _____________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/faq.htm
> Post: mailto:R-390 at mailman.qth.net
> Unsubscribe: http://mailman.qth.net/mailman/options/r-390
>