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Old 22nd December 2004, 06:50 PM   #1
jazz is offline jazz  Netherlands
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Default the secret was in the cookie jarr

Hi there

I've just made a complete **** out of myself and am a bit ashamed about it. Yet it is such a folly a have to tell.

Last week i finally got my dad to let me 'modify' his marantz pm78 amp. I have done his cdp, got him to recone his ar3a1 speakers so this was a start for the final stroke (he wants me to build him a tube amp).

I did nothing special to the amp. I changed the single poor and most important opamp for a 2134 and put in some bypasses and extra capacitance for the preamp psu.

After a few days i got the impression the mods had been succesfull. Yet when we sat down to listen tonight i noticed some strange sound in the left loudspeaker. there was something rattling, a coil scraping a magnet, osccilation or ringing.

Hence i started to check all connections, buttons and settings but nothing was found. So i started to ponder the possible consequences of my mods.

Maybe the change in opamp had shifted dc levels and reverse biased or blown an couling cap? maybe i had a bad soldering joint or cracked one? maybe the psu changes had caused ringing or oscillation?

After a few mindcrunching hours we sat down to listen and analyze the strange sound again when my dad had an inspiration.
He removed the christmas cookie jarr me mum had placed upon the speaker. Gone was the sound!

Damn those christmas ornament loving women and their cookie jarrs! It was the cookies rattling around, how could i've missed this!

Still feeling a bit embarrased

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Old 22nd December 2004, 08:43 PM   #2
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So what, didja eat 'em all and continue listening in peace?
Seven Transistor Labs, LLC
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Old 22nd December 2004, 08:58 PM   #3
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Location: London, Ontario, Canada
An unstuffed jar will rattle much more than one that is stuffed properly. The real culprit is the one with his hand in the cookie jar.

Those who claim to be making history are often the same ones repeating it.
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Old 23rd December 2004, 01:14 AM   #4
Stocker is offline Stocker  United States
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purplepeople you made me have to clean my monitor... laughing and eating don't mix!
Jesus loves you.
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Old 23rd December 2004, 03:12 PM   #5
jazz is offline jazz  Netherlands
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To solve the prob i dampened the cookies with lead sheet and sorbothane. Had me dad complaining the cookies tasted different somehow. Hmmm....

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Old 23rd December 2004, 07:21 PM   #6
jleaman is offline jleaman  Belgium
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Jazz Im dealing with the same thing. In this free subwoofer i have i have fixed it and put in a new plate amp its a cheap little thing a 8" woofer and a 50 x 2 watt amp inside with a external electronic crossover. any way there are so many little holes o the back of this plate amp i hear all of them and it ****es me off yes the box is ported but i still hear every little squeak ****es me off to because its like right there in my face * par say * so a new box i believe is the answer with a separate enclosed area for the subwoofer plate amp.. i hope..
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