Hi guys
I have an "old" Icon audio 40, it has been working fine but yesterday I heard a big pop coming from the right speaker. Today the same hapened again but that noise was stronger, then i switched off the amp but I could smell something burninng in side. I opened the amp and I could see what I think that is a resistor burnt.
I can simply replace that resistor but I have no idea what was the cause. I'd like to know to avoid other problems.
Here are some pics with a darker resistor (in the midle of the picture)
Thanks in advance.
Regards
flatsound
I have an "old" Icon audio 40, it has been working fine but yesterday I heard a big pop coming from the right speaker. Today the same hapened again but that noise was stronger, then i switched off the amp but I could smell something burninng in side. I opened the amp and I could see what I think that is a resistor burnt.
I can simply replace that resistor but I have no idea what was the cause. I'd like to know to avoid other problems.
Here are some pics with a darker resistor (in the midle of the picture)
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Thanks in advance.
Regards
flatsound
It looks like it's a resistor in series with the screen grid (pin 4) and using the non-connected pin 6 as a tie point. There may be an ultra-linear screen tap from the output transformer (orange lead?) landed on pin 6? It's difficult to tell - the photo is somewhat fuzzy. Use the macro setting (little flower icon) on your camera if it has one, and do not use any telephoto (don't zoom in).
Finally some good pics. Ty_Bower, thanks for your sugestion about the pics
http://img200.imageshack.us/gal.php?g=mytubeamp2019.jpg
Regards
flatsound
http://img200.imageshack.us/gal.php?g=mytubeamp2019.jpg
Regards
flatsound
flatsound said:Thanks for your replies guys.
llwhtt, Yes the value resistor is 100 ohms, +/-5%. The color strips are Brown, Black, Brown and gold.
Do you sugest any website to buy it from? Preferably English ones.
Farnell, CPC (part of farnell), Radio Spares, eBay
tube depot has nice resistors if you need carbon.metal oxide and high power.
http://www.tubedepot.com/resistors.html
i cant tell if the ones in your picture are half watt or quarter
it looks to be the metal oxide resistors here http://www.tubedepot.com/r-283.html
http://www.tubedepot.com/resistors.html
i cant tell if the ones in your picture are half watt or quarter
it looks to be the metal oxide resistors here http://www.tubedepot.com/r-283.html
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