Decca London Gold cartridge nightmare


Having read so much about the Decca London Gold cartridge, I decided to try one. Time passed and I finally found one on ebay that was within my budget. Cartridge was guaranteed to work with good results by a seller with very good feedback. Physically the cart looked neat, and everything, except for the mounting screws, was intact.

I had intended to install the cartridge in a new Kuzma Stogi S arm on a LP12 turntable but since the arm is scheduled to arrive end Oct 2008, I decided to try the Decca on my Lenco L75, with the original Lenco arm. At least to make sure all connections were OK, if not for any other reason.

What happened afterwards was pure nightmare. The results were horrendous, to say the least!

Tell me where I went wrong.

I tried tracking between 1.5 to 3gm but the sound ranged from tinny to severe breaking up. Even more startling, the groove vibrations picked up by the stylus was transmitted to the entire headshell, so you could actually hear the sound of the grooves generated acoustically by the vibration, kind of like a diaphragm or a gramophone horn. Lightly placing my finger on the headshell while a record played confirmed this. The headshell was quaking! With the preamp gain down to zero, you could hear the headshell vibration from a distance of a foot and a half, maybe even further, I kid you not.

The cartridge that I am presently using on my Lenco is a low output Audio Technica MC, the AT-OC3. No problems there. Tracks pretty well too, but not great, considering the Lenco arm was not made for MC carts. But the results were definitely more sane than the Decca!!

What's happening? Help!

Thanks for any advice, suggestions, feedback.

beck
tubemoose
Getting into this thread late, but both the poor sound and the breakage of the armature suggest that there may have been prior damage to Tubemoose's Decca.

Some people mess with Deccas and crack the tiny, thin steel armature where it does a 90-degree bend just below the vertical coil polepieces.

Deccas are not all THAT fragile if you only use a soft brush or soft pile stylus cleaner on them, and only stroke from back to front. I would not blow air into one to clean it. Don't FLICK the stylus (I know, nobody will ever admit to doing that, but be honest with yourself).

Some idiots have advised opening up a Decca's tin lid and tinkering with the tiny screws visible inside, to tighten up the string. Those screws do nothing of the kind. They adjust the gap between the vertical coil polepieces and thea armature. All you will do by messing with those is to mess up your channel separation.

Deccas prefer high mass arms and work well in damped unipivots such as the Keith Monks and Decca International, and in the Well Tempered Arm, which with its critical damping, simulates a high mass arm in many respects. The WTA's sand-filled armtube helps a lot, too. The Decca also has a synergy with the Rabco SL-8 linear tracking arm, which I run with a tubular arm wand filled internally with sand.
GP49, wow, you take me back many years. Do you still have a working Keith Monks arm? And a working Rabco!
Gp49, Your post made me smile. Some 20 odd years ago, a friend of mine and I each owned the then current version of the Decca London cartridge. We also had heard "somewhere" that fiddling with those little screws could improve the sound. I did this and found a sweet spot, where we both agreed that the cartridge sounded best. It took several weeks for us to figure out that we had converted the cartridge from stereo to mono. Maybe in a way the experience supports the aural superiority of mono playback.
Tbg:

"GP49, wow, you take me back many years. Do you still have a working Keith Monks arm? And a working Rabco!"
=========================

NO on one, YES on the other.

I don't have a functioning Keith Monks; couldn't find one when I was interested, and wound up building my own damped unipivot instead. I do have a working Rabco SL-8E with a homebrew arm wand. It's mounted on my Garrard 301, has a Decca in it, and I use it to play records regularly!

There was a Keith Monks on the infamous auction site last week. I don't think it got the reserve.
Tbg, I still have a working Keith Monks mounted on a Linn LP-12 valhalla with a Decca supergold. I've been using this combination for over 20yrs. and still haven't anything found anything that I like better. The Keith Monks was designed for the decca and is a marriage made in heaven.