On 22/12/2015 8:25 PM, Brian-Gaff wrote:
I have a denon here with a little relay like this, the problem seems to be
that relays get dirty, or wear aas this one has and e distortion varies and
the levels wobble when its time to take the lid off and do another contact
cleaning job...
Brian


**When I encounter such relays, I (wherever possible) replace the
original relay with a 4 pole C/O type, that uses gold over silver
contacts. They tend to last a great deal longer and with 4 sets of
contacts, some redundancy as well.

--
Trevor Wilson
www.rageaudio.com.au

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Yes but that would be major surgery of an old unit, and I cannot do this
myself now so I'll just patch it up. Incidentally I've just had similar
issues on an aerial attenuator switching relay on an ICOM communications
receiver. It was peculiar as when poor contact was being made the cross
modulation generated at first made me think an fet had died in the early
stages and gone non linear on me.
However a quick fiddle proved that it was just the effect of partial
contacting.
On the Denon, its really weird as when its in dodgy mode turning the
volume up produces some terribly broken up sounds as it presumably, once
again acts a little like diode and a resistor.
Brian

--
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Remember, if you don't like where I post
or what I say, you don't have to
read my posts! :-)
"Trevor Wilson" wrote in message
...
On 22/12/2015 8:25 PM, Brian-Gaff wrote:
I have a denon here with a little relay like this, the problem seems to
be
that relays get dirty, or wear aas this one has and e distortion varies
and
the levels wobble when its time to take the lid off and do another
contact
cleaning job...
Brian


**When I encounter such relays, I (wherever possible) replace the original
relay with a 4 pole C/O type, that uses gold over silver contacts. They
tend to last a great deal longer and with 4 sets of contacts, some
redundancy as well.

--
Trevor Wilson
www.rageaudio.com.au

---
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On 23/12/2015 10:18 PM, Brian-Gaff wrote:
Yes but that would be major surgery of an old unit, and I cannot do this
myself now so I'll just patch it up. Incidentally I've just had similar
issues on an aerial attenuator switching relay on an ICOM communications
receiver. It was peculiar as when poor contact was being made the cross
modulation generated at first made me think an fet had died in the early
stages and gone non linear on me.
However a quick fiddle proved that it was just the effect of partial
contacting.
On the Denon, its really weird as when its in dodgy mode turning the
volume up produces some terribly broken up sounds as it presumably, once
again acts a little like diode and a resistor.
Brian


**What you have found is something I've seen hundreds of times. Which is
why I employ the fix I described, if possible.

--
Trevor Wilson
www.rageaudio.com.au

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I'm sure, but the fact is in the end I still cannot do it myself any more,
so it will probably remain like this until IIpop my cloggs or a more
terminal fault occurswhen it will be decision time as to what to do.
Brian

--
From the Sofa of Brian Gaff Reply address is active
Remember, if you don't like where I post
or what I say, you don't have to
read my posts! :-)
"Trevor Wilson" wrote in message
...
On 23/12/2015 10:18 PM, Brian-Gaff wrote:
Yes but that would be major surgery of an old unit, and I cannot do this
myself now so I'll just patch it up. Incidentally I've just had similar
issues on an aerial attenuator switching relay on an ICOM communications
receiver. It was peculiar as when poor contact was being made the cross
modulation generated at first made me think an fet had died in the early
stages and gone non linear on me.
However a quick fiddle proved that it was just the effect of partial
contacting.
On the Denon, its really weird as when its in dodgy mode turning the
volume up produces some terribly broken up sounds as it presumably, once
again acts a little like diode and a resistor.
Brian


**What you have found is something I've seen hundreds of times. Which is
why I employ the fix I described, if possible.

--
Trevor Wilson
www.rageaudio.com.au

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