Quartz Lock
- Thread starter jeff2369
- Start date
lini
just me...
Anubis: Usually the quartz lock is only switchable on tables with pitch control, which makes sense - although there also are some speed control circuitries, which make use the quartz clock for reference even if the pitch control is active (e.g. Dual CS630Q).
Well, and the argument about quartz-based speed control producing more "micro-variations"/"micro fluctuations" (or whatever one wants to call these) often enough is pure nonsense, 'cause if one checks out a couple of actual implementations compared to their non-quartz siblings, one will pretty often find that the quartz clock basically is just an extra option for the regular version of the speed control circuity, so that those micro fluctuations would basically be just the same on the regular, non-quartz version and only based a less stable clock.
G73: I'm not really surprised there, because even leightweight belt-drives with dc motor and decent fg servo motor control circuitry can be pretty speed stable and have only a small deviation from absolute speed. Just to name example, even the priceworthy, slim Technics T4P radial trackers like the SL-BD20 are/were pretty good at that.
Greetings from Munich!
Manfred / lini
Well, and the argument about quartz-based speed control producing more "micro-variations"/"micro fluctuations" (or whatever one wants to call these) often enough is pure nonsense, 'cause if one checks out a couple of actual implementations compared to their non-quartz siblings, one will pretty often find that the quartz clock basically is just an extra option for the regular version of the speed control circuity, so that those micro fluctuations would basically be just the same on the regular, non-quartz version and only based a less stable clock.
G73: I'm not really surprised there, because even leightweight belt-drives with dc motor and decent fg servo motor control circuitry can be pretty speed stable and have only a small deviation from absolute speed. Just to name example, even the priceworthy, slim Technics T4P radial trackers like the SL-BD20 are/were pretty good at that.
Greetings from Munich!
Manfred / lini
My featherweight is a Technics SL-5 linear tracker. Not quartz lock as far as I can tell, at least they make no claim on the case that it has that feature. Speed is as stable as I could expect, but the platter is very light. My other machines are belt or idler drives and the platters are a fair bit more massive to maintain stable speed. My LAB 80 in particular has a platter that weighs nearly as much as the complete SL-5 does.
lini
just me...
g73: Yup, the SL-5 didn't have a quartz oscillator yet - neither did the SL-6, which was practically the same thing with track selector buttons, that strange half-blackened lid and the EPC-P23 instead of the -P24S. Only the later SL-Q5 and -Q6 were quartz-based, but I think neither of the two sported the tracking force fine adjustment anymore, and to me the older button of the -5 and -6 looked better anyway.
Greetings from Munich!
Manfred / lini
P.S.: A black (well, "Technics-NATO-Olive-green-brownish-metallic" one might rather say...) SL-5 was my first own proper hifi table, btw. Nice thingy - and also really good sounding, especially after I upgraded and swapped the EPC-P24S for an AT132EP. I really should never have sold that thing...
Greetings from Munich!
Manfred / lini
P.S.: A black (well, "Technics-NATO-Olive-green-brownish-metallic" one might rather say...) SL-5 was my first own proper hifi table, btw. Nice thingy - and also really good sounding, especially after I upgraded and swapped the EPC-P24S for an AT132EP. I really should never have sold that thing...
Soren Hammer
B&O-infected
I have had some flutter problems with one of my Beogram 8002 direct drive quatz controlled decks, though it only was a capacitor failure that caused it. It is calibrated and controlled by a small computer with accurate speed display and regulates with the input of a optical tachodisc system; very effecient. I don't know why people should believe that the quartz locking should make the motor doing jerky motions or otherwise induce any kind of unwanted effect.
The wow & flutter specs on my deck is in the 0.003% range, thus being impossible to detect. I have a couple of tonegenerator controlled decks which also work at a very stable speed (Beogram 4000, synchronous motor with AC-frequency generator). Wow & flutter specs are still at 0.05% witch is also the effect of the 4 kg platter assembly while the total platter assembly of the Beogram 8002 only is 250 grams.
The wow & flutter specs on my deck is in the 0.003% range, thus being impossible to detect. I have a couple of tonegenerator controlled decks which also work at a very stable speed (Beogram 4000, synchronous motor with AC-frequency generator). Wow & flutter specs are still at 0.05% witch is also the effect of the 4 kg platter assembly while the total platter assembly of the Beogram 8002 only is 250 grams.
Ken Creamore
New Member
My Pioneer PL- 570 quarts lock is dead on and has not been any trouble. If I turn off the QL I can see the table drift immediately. Soon as I turn it back on the table dead on again. My Pioneer CT - F1250 cassette deck is Quarts Lock as well and Pioneer started using it in the FM turners. Quarts Lock has been used in watches for years and I can't imagine anything needing to be more accurate then a watch.
62vauxhall
Addicted Member
A couple of years ago I traded several "lesser" turntables for a Pioneer PL-630 at a shop that reconditions turntables. Most of the time, Quartz Lock did well but every so often the speed slowed down. This seemed to happen within the first 10 minute or so of play start. Switching Quartz Lock off once or twice corrected the problem which never reoccurred for the rest of the listening session.
I came upon a fairly extensive thread started by someone doing a complete restoration of a PL-630. In it was mentioned a speed issue with Quartz Lock engaged and the solution was contact cleaner for the on/off switch then exercising the hell out of it.
The direction was as to push the switch on and off 300 times. Unnecessarily too many I thought but I did it anyway and at no time since had the Quartz Lock failed.
Maybe your table would benefit from the same proceedure?
I came upon a fairly extensive thread started by someone doing a complete restoration of a PL-630. In it was mentioned a speed issue with Quartz Lock engaged and the solution was contact cleaner for the on/off switch then exercising the hell out of it.
The direction was as to push the switch on and off 300 times. Unnecessarily too many I thought but I did it anyway and at no time since had the Quartz Lock failed.
Maybe your table would benefit from the same proceedure?
