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71.230.230.112
my Ortofon 2M Blue stylus. I didn't know whether to post this in the vinyl or vintage asylum so I posted in both. In the last few weeks I noticed when I play a record the bass isn't what it once was. Everything else sounds fine, It's just the bass. I keep the tone controls flat and I always had enough bass. I now have to have the bass control at 2 o'clock to get the same output. This only happens when I play a record. When I play the FM tuner or cd player the bass is normal. That tells me that amp section, line stage, and tone controls are okay. I thought it may be the tubes in the phono stage, but it isn't. I have several sets of 12ax7's and I tried them all and got the same results. I have a spare 2M Blue cartridge body (no stylus, just the body) and I switched it with the one on the arm. Same results, so I know thats not the problem. I adjusted the vta and that didn't help either. It can get a little chilly in my room. Right now its 52 degrees. I spoke to a couple of people about that and they said the cold temp could affect the suspension on the stylus and once it warms up everything will get back to normal. If that's the case why doesn't this happen every winter. I've had stereos in the same room for over 25 years and this is the first time this has ever happened. Is it possible the the cold temps permanently damaged the suspension and the stylus should be replaced (the cartridge is a little less than 2 years old with about 300 hours) or is there something going on in the phono stage (the amp was fully restored about 4 1/2 years ago) other than the tubes? Could it be a weak cap or a faulty resistor? If I knew it was the stylus I would just buy a new one and be done with it. If I knew of a reliable tech in the Philadelphia area I would let him take a look. With my luck I would replace the stylus and amp would be the problem or I would take it to a tech and he would tell me the amp is fine and it must be the stylus. I don't know what to do. Any help will be greatly appreciated. Thanks.Bob
Edits: 03/01/15Follow Ups:
It could be something as simple as a supension adjutment on the turntable.....but then that would depend of if your turntable has any such adjustments.
I'm inclined to think you could be looking in the wrong direction. Also mention if you have changed anything....equipment/room layout....even the furniture or curtains....anywhere in the house.
Bob
Is your Lk72 rebuilt? It sounds as tho it may be in the phono section.
When did you first notice the diminished bass?
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
I noticed it about a month ago. The amp was totally restored about 4 1/2 years ago by Ryan Inman of Hot Glass Audio. He did an outstanding job. Unfortunately he's not in business anymore. I had no idea a properly restored vintage amp could sound so good. The fact that I kept it that long says a lot. That's the longest I've ever kept any amp or preamp. I hope it's just the stylus. Thanks.
PS: I'm still loving the Mac tuner I got from you awhile back.
Here is what I would do.
Pull out the phono and preamp tubes and spray some electronic cleaner into the sockets...Deoxit D5 is a good one for that and don't worry about over spray as it won't hurt anything but try and get most of it into the socket holes..Then pull the tubes in and out a few times,the phono tubes especially to get the cleaner worked in.Lastly, you want to spray around the phono input jacks where your turntable plugs into.The phono voltages are so low that any electronic disassociation with those connections can be an issue.
I'm glad you love the tuner..I just saw that..Check your stylus pressure as well but do you have another unit you can hookup even if it's solid state? That will tell us if the stylus has an issue..Usually when the stylus wears,you lose high end and its starts to take on a harsh sound.Do you have a scale to check stylus pressure?
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
Edits: 03/01/15
My father taught me to use pipe cleaners and alcohol on the tube sockets. Now I use Deoxit, but I think the pipe cleaners are still a good idea. I save the alcohol for when I listen, and I buy better stuff.
Dave
I was tracking at 1.9 grams and increased it to 2 and there was no change. I don't think the stylus is worn. If anything it may be the suspension.
If you have good clarity and the mids and highs are good on the phono,lets spray those tube sockets.Sometimes just pulling out the tubes and reinserting them can make a difference.Do you have another amp or receiver with a phono stage so we can rule out if it's a turntable issue or not?..A solid state unit will be just fine.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
Edits: 03/01/15 03/01/15
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