Rek O Kut B12H Rehab Thread

[mr_rye89]

Okay so the Rek has a big ugly plinth that is big and ugly and badly made. I built it out of layers of plywood and it's massive because it kills the rumble from this idler drive motor unit. But it's an eye sore and hacked up because I can't decide on a tonearm........

 

[mr_rye89]

So I got two 16 x 20 rubberwood cutting boards and one 15 x20 acacia cutting board from Ross and i came up with this. An angle grinder with a wood carving wheel plus a Dremel made this possible.

 

[mr_rye89]

The notch in the right hand corner is for an arm board to accommodate a 16" tonearm. For now I'll be mounting the Micro Trak 306 (269mm spindle to pivot distance) but I'm eyeing a Stax UA-70 (300mm spindle to pivot distance). The arm board I'm coming up with will be easily detachable and somewhat decoupled from the plinth

 

[mr_rye89]

Shot of the acacia strips between the cutting boards

 

[laatsch55]

Pretty neat project there Kyle...

 

[J!m]

I like the weighted feet!

 

[bill7621]

I like the weighted feet!

That will cut down on any rumble.

 

[nakdoc]

You want the arm board to bond to the plinth so there is zero relative movement between arm and plinth. If they are separate, motor vibrations are maxed out by an isolated arm.

 

[J!m]

It can go either way. Plenty of sprung set ups out there.

But I tend to agree- little relative motion, yet isolated.

When I reworked the Rega, I have a somewhat massive plinth, but a constrained layer sub-plinth is also added. Each element is on it's own elastomer-coupled layer. Motor, feet spindle and arm.

I would probably keep it simple and have a bolt goung through the two plinth layers and sandwiching the arm board between them.

But the only way to really know is to listen to the final design.

 

[MB1953]

Nice job!

Makes me wish I had kept mine, now knowing now the rumble from the idler motor system could have been silenced by use of a well made wood base.

Has the new base absorbed the rumble vibrations enough?

 

[mr_rye89]

I'm not sure yet, I had to re glue last night, didn't sand off the finish where I glued it, it came apart....d'oh. I also screwed up the arm board. Once I have the arm board fixed I'll probably put the RB300 back on it to check for rumble. Obviously I don't need the arm board to mount a 9" arm but i want this mostly done before I run it. I have some goofy spike feet and a little bitty VFD on order (to dial in the motor speed)

 

[J!m]

Mount the arm board in a dovetail and drive it in/out with a threaded rod across the plinth. Then you can accommodate any spindle to pivot by turning the knob until it's correct for the desired arm.

 

[mr_rye89]

I may look into that, the original plan was to just have long bolts thru the arm board into the plinth. My ability to make things square/level/straight isn't great.....

 

[mr_rye89]

I'm also considering a SAEC WE-308L arm, should be 265mm spindle to pivot distance. We'll see if that lines up, I shoulda put the motor unit closer to the right hand side. I guess I could notch out the plinth some more for a longer arm board lol

 

[mr_rye89]

Okay the VFD might be a dead end, it was advertised as being for 120 volts but won't run on that, gonna plug it into 240 later for the lulz.

I figured out the arm board, had to notch out. not real square but close enough. 60 mil roofing EPDM for decoupling.

 

[Gepetto]

Okay the VFD might be a dead end, it was advertised as being for 120 volts but won't run on that, gonna plug it into 240 later for the lulz.

I figured out the arm board, had to notch out. View attachment 85248 View attachment 85249 not real square but close enough. 60 mil roofing EPDM for decoupling.

Not sure you really want that chopped up VFD AC running into a turntable motor anyway that is near to a very sensitive pickup

 

[mr_rye89]

Yeah i was gonna check the waveform before plugging the motor in. Maybe just need a smaller diameter capstan.

 

[mr_rye89]

Joe was right. Kinda hard to see but that AC is not okay.....

 

[Hexis22]

Joe was right.

Lost count the number of times I’ve said that…

 

[mr_rye89]

Mocked up with the RB300 for testing. Sounds pretty good like this. I jumped on an Audiocraft AC-400C oil dampened unipivot tonearm. Should be here from Japan mid month