You know you're welcome any time Grant . Just let me know and I'll see if I'm off that day .
Your speakers were sounding very good indeed when I was over :)
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The particular technical aspects of the Lenco however have a lot of moving parts which maybe benefit from a bit of compliance? Rigidly coupling everything may introduce unwanted vibration or resonance which may not be noticed in a slightly compliant chassis(plinth /top plate) ? Anyway it's interesting and fun to experiment.
One thing I would add however is that unless you could listen to a completely unmodified Lenco against the modified Lenco benefits in addressing some of the 'weaknesses ' of the original design may not be as great as imagined?:)
I know for fact that there are a few folk who have changed tone arms and plinths etc on a number of Lenco's and the improvements in SQ have been marginal although they may have spent large sums of money and time in doing so.
I agree with up about rigidity with regards vibrations and resonance getting into the tonearm and cart but this becomes pointless if the tonearm if mounted on an external pod and not part of the top plate. Additionally isn't it more with specific values of Hz that are important with regards resonance getting into the tonearm my understanding is that you should eliminate specific Hz values or "retune" specific Hz values low enough so they have no audioable (SIC? sorry im tired) effect.
Well I learned my lesson with my 1210, never again! I think the standard / heavy plinth experiment could be a good idea for a bake off one day! PTP audio (the guys that make the PTP plate) actually suggest using corian as a plinth material. :eek:
More on the deck.
Fettling and tweeking has well and truly started. I was going to make one of these to make sure that my idler wheel was aligned. This is a template that a LH member devised and then I thought why bother? The deck is spinning silently and the platter turns at 33.3 RPM.
Attachment 18085
I also considered earth the top plate to the motor a suggested over on LH. Again I'll pass on this. The deck has no hum whatsoever I dont really want to introduce a mechanism of transferring motor vibration from the earthing lead into the top plate, so that's another mod consigned to the bin.
Some slight tweekig with the speed selector revealed I was probably going round at 34 RPM :stalks:. We now be spinning at 33.3RPM.
Attachment 18086
I also played some vinyl tonight with the cart at 1.6 and 1.7g and can confirm I got some mis-tracking issues and the surface noise was greater increased so now I'm convinced that 2g (at least on this lenco) is best for tracking and surface noise with the Shure M55e and new JICO stylus. Right that's it. I think I'll be doing some bearing research soon.
Lack of proper rigidity means vibration and movement are likely to reach the tonearm and that can superimpose cancellation and interference effects onto the signal modulations being 'read' from a record being tracked by the stylus.
Yeah. I feel knackered too today. Not done that much. Must be the weather.
No update tonight I'm spinning a DECCA Maroon on the 301. :eek: Just a few comments on the deck so far.
The soundfloor on this deck is very low and surface noise on a decent piece of vinyl is non-existant. The bass on this deck is also fantastic. My main reference for how much bass a deck can kick out is the 1210 I own. No whilst the technologies are poles apart DD v IDLER it's not to say that the bass output sufferes from such a wide chasm, it dosen't, the '75 is pretty proficient is knocking out a decent bass line and I would say that fitted with a decent cart things could be improved even further. I noticed that percussion was particular good as well. Listening to Van Halen was a pleasent experience and only something I usually experience on the 1210. The more I sit down and listen to this little deck the more I like about it. Tomorrow the Alphason gets a small upgrade!
Yes I'm enjoying mine Andrew . Unfortunately I don't have another turntable to compare it with and TBH I don't really feel the need :)