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Turntable rumbling

Hello Friends, merry xmas
I have at the moment, a Michell Tecodeck turntable, with a Garrot Bros updated P77 cardridge, I have bought new speakers and amp, Redgum amp, with phono stage, and Usher speakers, I have enjoy the "Break in Stage" of all equipment, as It was so much better, but after approx 50 hours use, all of a sudden the LP,s, have a bass boom, at the start of the LP, and any warped LPs is un playable, I took out the styls, from the cartridge, and seems OK.
All My LP's are mimt no clics and pops!!
The last time I played the LP's was on a Well Tempered Classic, an I had no promblem.
I have set the cartridge, on the correct weight, well the Sure was 1gm out compare to the digital, friends I'm geting upset not good after a heart attack!!
Can someone put me on the right track, as I have just got back into Hi Fi, Where I live down here, on the South Coast of Australia, there is no shop, that deals with Hi-Fi, to get any assistance I have to drive 4 Hours to Sydmey!!
Kindest Regards
David Spry
128x128daveyonthecoast
hifitime
715 posts
 
I reread your post. If you're using a Shure M97xe type of cartridge, you may need to set it at around 1.75 grams, if you have the brush/stabilizer in the down position. If you have it in the up position, it appears it should be set at around 1 to 1.25 grams. So maybe your using too little tracking force instead. I would double check the tracking force, and see if it is in the manufacturer's recommended area.

You said 1 gram out, and I'm not sure if you mean off by 1 gram, or set at 1 gram. And, I'm still not sure you are using this type of cartridge. It's hard for me to post an answer if you have a question, due to AudioGon moderators taking extra time to read what I've said. Their friends that sell power cords don't like some of my answers given in the past, causing the extra delay.
tbromgard
814 posts
 
if its rumble, get a filter?
hifitime
715 posts
 
Ignore my comment about Shure. A friend had me trying an Ipad, or something like that with a small screen. Besides double checking your arm setup, may possibly someone else used your table and dropped the arm causing damage to the cantilever, or suspension? Sometimes they give out, possibly due to a defect. Someone here found out their cleaning person damaged theirs without knowing.

I'm not familiar with your gear, but double check with the dealer to see if the cartridge's compliance is compatible with your arm. Checking all the wires for clearance mentioned above is a good idea too. Maybe someone here may be familiar with it and hopefully chime in.
davide256's avatar
davide256
395 posts
 
sounds like a mechanical issue. Start here

1) have you physically changed your setup recently... moved speakers or the TT? If so put them back where they were to see if you were causing yourself feedback or found an unstable TT location.

2) recheck your stylus pressure.. most of what you describe sounds like the pressure is too light. Most cartridges will behave better at 0.3gm heavier than the nominal tracking force recommended. Its always possible something got bumped and the pressure needs recalibration.
davide256's avatar
davide256
395 posts
 
hmm above it says you set the TT at 1g m, yet the spec I searched out says the nominal tracking force is 1.8 gm.

http://www.toffsandtinks.com/shop/a-r-arcam-p77-stereo-pickup-cartridge/info_32.html
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