On Tue, 09 Nov 2004 22:05:19 +0000, JustMe wrote:


Can anyone confirm my translation of the resistor colour codes (gathered
from an identical amp as those in the faulty amp were badly burnt):

1st digit: Brown: 1
2nd digit Black: 0
Multiplier: Black: 0
Quality: Brown: 1

I make this 10 ohms of a high-tolerance 1%/1000 hour anticipated failure?


If the amp is pretty old then you are right, apart from the 4th band which
usually means 1% tolerance (silver=10%, gold=5%, red=2%). Some old
resistors had a salmon pink band at the end to signify "high stability" -
but that is a while ago!

There are now resistors with 4 bands, where the 4th band is the
multiplier. In this case your value would be 1k. These are produced so
that you can revel in delightful values like 91k!

How about measuring a known good resistor out of the other amp and
comparing them? A resistor will almost always fail open circuit or
high in value. If the other amp has been working fine, and its resistors
are not burned, then you should be looking for whatever caused the burning
(e.g. a shorted transistor or something like that allowing excessive
current flow for too long).

--
Mick
(no M$ software on here... :-) )
Web: http://www.nascom.info