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Messages - OZDOC

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1
The Wurlitzer Electric Piano / Re: shipping crate design?
« on: May 22, 2019, 07:38:40 PM »
Here are some things that have worked for international shipping.
Double wall cardboard is fine - but I always use bubble wrap and styrene foam layers.
I always try and make sure that the pack is a two person lift - so that a single guy doesn't keep dumping it on its end.
I try and make sure small forklift standoffs are included so forklift tines aren't punched into the keyboard.
David

2
Other Keyboards & Software Synths / Re: Helpinstill or Roadmaster
« on: April 19, 2019, 07:28:03 PM »
My guess would be that this is only a branding change.
Helpinstill started by selling pick-up systems to install in the buyer's own piano and then moved on to modify acoustic pianos that they bought from a supplier themselves.
At some point they coined and started advertising the Roadmaster product name - easier to say that Helpinstill.
You could possibly track down the start point of this in ads placed in Contemporary Keyboard.

3
The Fender Rhodes Electric Piano / Re: Torn out wood around t-nuts
« on: March 14, 2019, 06:10:36 PM »
I would remove the keyboard so that the inside wood can be repaired properly.
If the vinyl cloth on the outside is not going to be replaced I'd chisel or rout a recess from the inside and insert a new piece of plywood.
The recess would only go 3/4 of the way through the original timber to preserve the vinyl cladding on the outside.
Ordinary PVA woodglue would be sufficient to hold this in place.
I'd remake all the holes in this new piece of wood.

4
Other Keyboards & Software Synths / Re: CP80 upright storage
« on: February 19, 2019, 04:37:33 PM »
I can't see any reason why this would harm it. But you'll need to put a sheet over everything to keep dust out. And you will be making it easier for vermin to get to the felt components.

5
Other Keyboards & Software Synths / Re: Cembalet CF
« on: February 19, 2019, 04:35:06 PM »
While I have no proof of this, the reeds in a Cembalet may well be from one of the larger piano accordions that Hohner was making at the time.
In the bass they are lighter than the reed set that was used in the Pianet. Can you locate a piano accordion repairer who might be able to comment on this?

6
Other Keyboards & Software Synths / Re: Cembalet CF
« on: February 12, 2019, 06:06:49 PM »
Crackling can obviously be tiny particles caught in the gap between a reed and its pickup.
I'm assuming you're confident that the gaps are all dust free?
I sometimes use a piece of clay coated 80gsm paper slid through these gaps as a way of making sure they are clear of invisible particles.

7
Other Keyboards & Software Synths / Re: Helpinstill 64
« on: February 11, 2019, 07:00:25 PM »
My understanding of this piano is that Helpinstill will have purchased the core of the piano from Aeolian - or similar. So, if you ask around, you may be able to find the matching acoustic piano for a very small price to borrow parts from.
If the piano can't be saved then move the Helpinstill pickups and electronics to another piano.

8
Other Keyboards & Software Synths / Re: Helpinstill 64
« on: February 10, 2019, 07:30:33 PM »
First make sure that the piano is still able to hold its tuning.
If there are problems with the wrest plank and tuning pins then it may not be worth the effort.

9

The Pianet built into the Clavinet/Pianet Duo is the version that uses electro-magnetic pickups.
The electronic requirements of both the Clavinet and Pianet only relate to a pre-amplifier to prepare the signal for output to an amplifier.
This is a low-voltage, low current requirement, more than adequately powered from a small battery.
There is no electrical danger involved in this circuit.

If you were powering the unit from a mains voltage adapter that managed to fail in a way that sent mains voltage to the keyboard's 9V input this could conceivably create a hazard.
But this would be a very unusual occurrence.

Perhaps shoes or clothing you were wearing built up a static electricity charge that discharged when you touch the Duo's metal components?

David

10
Other Keyboards & Software Synths / Re: Cembalet CF
« on: October 27, 2018, 07:47:43 PM »
I think that "gone bad" is improbable. For this transformer to burn out the mains voltage would need to get to it - in which case lots of other things would have fried.
The most likely fail for this transformer would be a broken wire near the connection point to the PCB.

11
Other Keyboards & Software Synths / Re: Cembalet CF
« on: October 25, 2018, 05:44:55 PM »
The CF version of the Cembalet is one of the versions where the reed/pickup voltage differential is derived through a transformer from the 12V DC supply (rather than being derived directly from the mains transformer). I think the first transistor in the circuit (the AF101) is forming an oscillator in conjunction with the primary winding of that "unexpected" coil you are seeing.
The secondary winding provides the stepped up voltage to the reed bar.
With the reed bar disconnected from the circuit you should be able to read an AC potential of something around 100V (I think).
If that oscillator stage is not functioning then the reed bar does not have the FM carrier wave that it requires to function.
Unless someone has badly treated the circuit board you'd first suspect the AF101 transistor has failed.
But make sure all four connections from the transformer coil are in place.
David

12
Other Keyboards & Software Synths / Re: Cembalet CF
« on: October 23, 2018, 10:00:29 PM »
This sounds obvious - but are you sure that none of the reeds are shorted against the pick-up tabs?

13
Other Keyboards & Software Synths / Re: CP70 preamp bypass
« on: August 06, 2018, 09:36:10 PM »
Two thoughts come to mind:
I understand that the output of piezo pickups is not lineal - that loudness goes up exponentially with force. So this may cause some issues and is probably addressed in the input stage of the Yamaha pre-amp.
The patch out jack for accessories comes immediately after the initial pre-amp stage of the circuit. This stage also has the tone controls. So if you wound all the tone controls clockwise so that the filtering of these controls is eliminated and plugged the signal from the patch out jack into your amp you'll get a fair idea of whether it's worth bothering with anything more invasive.
The question is, what do you think you're going to achieve by double guessing Yamaha's engineers?

14
The static issue with silicone pads substituted for the original leather and urethane Pianet pads is caused by tribocharging - an electrical charge induced by peeling the silicone off the metal reed when a note is played.
I'm guessing that substituting felt dampers for the original urethane foam is also a charge issue - but in this case the felt may have changed the insulation characteristics compared to the original damper material.
Sometimes the original manufacturer actually knew what they were doing and the replica parts are the problem:-)
I have yet to restore my Cembalet but I'll now be watching out for this issue.

15
Other Keyboards & Software Synths / Re: "Player" Elepian
« on: June 16, 2018, 08:17:49 PM »
What is the function of those 4 little crank bellows to the right of the roll feeder?

16
Other Keyboards & Software Synths / Re: "Player" Elepian
« on: June 13, 2018, 06:59:04 PM »
I'm wondering whether the electronics and roll player mechanism was designed and installed by Columbia or QRS?
It may be that all the internals were designed by QRS and the Elepian was chosen as a cheap housing for them.

It would be worth contacting QRS or chasing down some of their former employees to see whether they can supply any schematics or information.

David

17
Other Keyboards & Software Synths / Re: "Player" Elepian
« on: June 11, 2018, 10:24:11 PM »
Great post. I've not seen one of these before. I have a "normal" one.

The normal one has a conventional piano action (cheap) with hammers striking tines and Rhodes style magnetic pickups.

Did your piano start life with this mechanism and have it removed by the people that did the piano roll adaptation?

Your piano obviously makes all its notes electronically? So the problem for anyone on this forum providing help is that your electronic structure is miles different than the simple audio amplifier in most of these instruments.

Nevertheless, the conventional approach is to first ensure that the power supply is providing clean voltage at the required voltages to the rest of these boards. Once that is certain, check that the audio amplifier is capable of amplifying a signal and sending it to the speakers. If you still have a problem it is in that nightmare section that deals with the keying that no one without the circuits and a similar instrument will be able to help with by remote control.

David

18
Sounds like you may have temporarily exposed the transistor that follows the Zener diode to the 280V of the reed bar.
Try replacing the Zener first then replace the transistor next to it?

19
The Wurlitzer Electric Piano / Re: Feet for a 200A
« on: May 05, 2018, 07:57:46 PM »
Valuable post. Thanks.

20
I have used both a Presonus Xbox firewire interface and a Mackie firewire digital interface equipped mixer.
Check the impedance matching - and check for any clipping.
You shouldn't have any problems.

21
Other Keyboards & Software Synths / Re: Mute Slider
« on: March 18, 2018, 06:46:19 PM »
Are you looking for the whole internal assembly or just the knob?

22
Other Keyboards & Software Synths / Re: Mute Slider
« on: March 17, 2018, 12:01:29 AM »
A Mute Slider for what?

23
Other Keyboards & Software Synths / Re: Cembalet / Pianet Vibrato Clicking
« on: February 07, 2018, 06:57:57 PM »
The 100mV output is intended for the accessory CP amplifier that hangs under the Pianet N.
The take-off point is before the final transistor in the circuit so I'm guessing the CP amp is looking for a different impedance than the normal output.
When you use this as your output what you plug in is interacting with the preamp circuit in an unexpected way.

24
Other Keyboards & Software Synths / Re: Cembalet / Pianet Vibrato Clicking
« on: February 07, 2018, 05:24:08 PM »
This is a long shot - but I've found that these are sensitive to the proximity of the bulb to the sensor.
Is the bulb too close/too far away.
And the sensor should not be exposed to other light when you are reviewing the effect - in other words you need to shade the board from room light falling onto the sensor if the cover is off.

25
The Fender Rhodes Electric Piano / Re: Zinc Plating On Tone Bars
« on: January 29, 2018, 11:25:43 PM »
So those must be glut(t)en free tines?

26
The Fender Rhodes Electric Piano / Re: Zinc Plating On Tone Bars
« on: January 28, 2018, 04:43:56 PM »
So...that means you really need to stump up to get them zinc passivated again...right?

27
The Fender Rhodes Electric Piano / Re: Zinc Plating On Tone Bars
« on: January 27, 2018, 06:47:12 PM »
It sounds to me like he is painting the tonebars.
He apparently puts down a sealer, then a silver paint, then a varnish over it?
The tone bars will look clean - but different from the originals.

My immediate reaction would be that it is the mass of the tonebars that is the important property in preserving the vibration of the tine.
Painting them may increase the mass very slightly but I would not think it would be significant.

Others may know better.

28
Other Keyboards & Software Synths / Re: Cembalet Pluckers?
« on: December 07, 2017, 03:52:11 PM »
Ebay Identity
achaemenes (295)
100.0% Positive Feedback
Member since Jan-07-99 in United States
Location: MO, United States

His name is Stefan

https://www.ebay.com/usr/achaemenes

He sells pluckers and dampers for the Cembalet

29
Amps, Effects & Recording Techniques / Re: Orange amp ?
« on: November 20, 2017, 05:25:15 PM »
What any high powered tube amp will give you is plenty of undistorted clean headroom.
In another thread on this site the two most popular amps people use with their Rhodes are the Fender Twin and the Roland JC120.
With that clean power available and and ability to set the level of crunch in the pre-amp that you have noted in this video you have tight control.
From there on it will be the sound of your particular Rhodes that you hear.
This sound is dependent on the era of Rhodes you own, its condition and accuracy of set-up.
What can't be seen in this video (at least the parts I've seen) is any effects that might have been applied by the player - and the effects applied making the recording.

30
Amps, Effects & Recording Techniques / Re: Orange amp ?
« on: November 20, 2017, 02:33:56 AM »
Ooops - sorry, you did provide a marker ;)

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