Micro Seiki 1500

Cobra2 · 22nd October 2003, 08:32 PM

Please help...

I just "found" a RX 1500 w/ Rega-arm, and it needs a little attention.
And maybe some "tweaks".
My own suggestions: New PSU, and make a groove on the lower part of platter to hold a thick O-ring (damping). ???

Other suggestions?

Arne K

Nat Eddy · 23rd October 2003, 02:39 PM

If you do any tweaks, please report on your findings. But its not the easiest table to remove the platter from. The manual would be helpful for this task, and if you don't have the manual, I believe it is downloadable at Vinyl Engine.

Cobra2 · 23rd October 2003, 03:12 PM

It is similar to this (picture), with alu-platter.
Had a look at motor & psu, and revised my plan to re-new all el-caps. And a filtered IEC plug.
Next step here would be a all new motor-unit...?

For the platter; I will have to check with my friend which is a magician on the lathe...

Arne K

Petter · 23rd October 2003, 06:08 PM

How much did you have to pay?
What was the condition?

Envious Petter

Cobra2 · 23rd October 2003, 06:28 PM

Condition: worn, but not bad...and modified by an amateur...

Luckily it seems that the mods are easy to rectify, (in the process).

Arne K
(Can resist ANYTHING! (-but temptations)).

innernerd · 24th October 2003, 03:41 PM

I have modded this platter as I had a spare for my Rx1500. The standard aluminium piece is a bit resonant so I added a layer of lead underneathand then filled the remaining cavity with plaster of paris. Depending on how carefull you are, the balance may need correcting although its not absolutely critical at these slow rotational speeds. The effect was good - firming up the soundstage and increasing the dynamic range by virtue of a quieter background.
I also have a plinth wieght that bolts to the underside of the plinth casting. However its not fitted at the moment as I dont think it will be compatible with the standard suspension springs. I need to source some heavier springs to maintain the system frequency.

Colin A.

Cobra2 · 29th October 2003, 04:17 PM

My M-S have now been in "atoms", and rebuit, working perfectly.
Damper-feet have been greased with new silicon-grease(Molykote-111), main-bearing has been cleaned and refilled w. Mobil 1 synthetic automatic trans-fluid.
When giving the platter a slow hand-spin, it runs for several minutes!

Next step: platter...
Somewhere I had a nice formula for making a strobe, but cannot find it, can somebody please suggest how many marks on a given diameter I need? (50Hz)
(Planning to machine small marks on lower edge of platter)

Arne K

Cobra2 · 29th October 2003, 04:40 PM

see the dimentions...and perfect machining!
(never mind my finger-print on the main-shaft...).
Shaft is ~ 16mm Ø

Arne K

planet10 · 29th October 2003, 06:09 PM

Quote:

Originally posted by Cobra2
Next step: platter...
Somewhere I had a nice formula for making a strobe, but cannot find it, can somebody please suggest how many marks on a given diameter I need? (50Hz)
(Planning to machine small marks on lower edge of platter)

SDS Labs has a downloadeable strobe for 50 & 60 Hz.

dave

Cobra2 · 29th October 2003, 07:05 PM

a better one here: http://www.78rpm.com/pages/rescat/audio/strobe.htm

Arne K

22nd October 2003, 08:32 PM	#1
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	Micro Seiki 1500 Please help... I just "found" a RX 1500 w/ Rega-arm, and it needs a little attention. And maybe some "tweaks". My own suggestions: New PSU, and make a groove on the lower part of platter to hold a thick O-ring (damping). ??? Other suggestions? Arne K __________________ Ars longa, vita brevis

23rd October 2003, 06:28 PM	#5
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	About $ 350+ = "cannot resist" - price. Condition: worn, but not bad...and modified by an amateur... Luckily it seems that the mods are easy to rectify, (in the process). Arne K (Can resist ANYTHING! (-but temptations)). __________________ Ars longa, vita brevis

29th October 2003, 04:17 PM	#7
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	Progress... My M-S have now been in "atoms", and rebuit, working perfectly. Damper-feet have been greased with new silicon-grease(Molykote-111), main-bearing has been cleaned and refilled w. Mobil 1 synthetic automatic trans-fluid. When giving the platter a slow hand-spin, it runs for several minutes! Next step: platter... Somewhere I had a nice formula for making a strobe, but cannot find it, can somebody please suggest how many marks on a given diameter I need? (50Hz) (Planning to machine small marks on lower edge of platter) Arne K __________________ Ars longa, vita brevis

29th October 2003, 07:05 PM	#10
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	found it... a better one here: http://www.78rpm.com/pages/rescat/audio/strobe.htm Arne K __________________ Ars longa, vita brevis

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23rd October 2003, 02:39 PM	#2
Nat Eddy diyAudio Member Join Date: Feb 2003 Location: Connecticut	If you do any tweaks, please report on your findings. But its not the easiest table to remove the platter from. The manual would be helpful for this task, and if you don't have the manual, I believe it is downloadable at Vinyl Engine.

23rd October 2003, 06:08 PM	#4
Petter diyAudio Member Join Date: Jan 2001 Location: Scandinavia	How much did you have to pay? What was the condition? Envious Petter

24th October 2003, 03:41 PM	#6
innernerd diyAudio Member Join Date: Oct 2003 Location: N.Wales	I have modded this platter as I had a spare for my Rx1500. The standard aluminium piece is a bit resonant so I added a layer of lead underneathand then filled the remaining cavity with plaster of paris. Depending on how carefull you are, the balance may need correcting although its not absolutely critical at these slow rotational speeds. The effect was good - firming up the soundstage and increasing the dynamic range by virtue of a quieter background. I also have a plinth wieght that bolts to the underside of the plinth casting. However its not fitted at the moment as I dont think it will be compatible with the standard suspension springs. I need to source some heavier springs to maintain the system frequency. Colin A.

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