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Messages - 4kinga

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I have an old 120 I found on the sidewalk in LA (seriously) and it had obviously been somebodies guinea pig for electronic experiments. The amp doesn't match the wiring schematic completely, so bear that in mind.
Be afraid.  Very afraid.

Check it out, or have it checked out.


Whenever I use the headphone or speaker outputs I get a serious hum (50/60hz?) in both the onboard speaker and the amp I'm plugging into. The piano is very quiet otherwise. I can use the headphone jack for headphones alone and it sounds great. It's only when I plug into something that is also powered that the problem occurs.
Sounds like a ground loop

Now the kicker is that when plugged into an amp, all of the components connected to the ground circuit on both the piano and amp become dangerously "hot", as in charged electrically. That is, the chassis, cable ends, screws, etc.
When plugged into a DA converter I get clip lights in ALL channels and the shock problem. Safe to say I didn't try that for long...

Does your power cord have keys on the legs (neutral is wide, hot is narrow)? On my 145a, if I reverse the power cord, I don't get any hum.  (Been meaning to change it to a keyed plug, but.....)

Parts, Service, Maintenance & Repairs / Re: Rewinding Rhodes Pickups
« on: January 18, 2011, 01:27:40 PM »

You can try a method I've employed with some success:

If the break is close to the post, you can
- scrape the enamel from the wire and fold over. 
- Create a short leader from spare wire and scrape the end. 
- Create a loop/hoop on the leader.
- Thread the pick-up wired through the loop on the leader and solder.
- Solder the leader to the post.

Measure the pick-up with you dvm. 

Not sure how well it stands up to heavy touring, but in controlled environments, it works well.

There was a short discussion a while ago about a possible preventative method, but I don't believe it got far.

Also, while you're doing all that, you might as well replace all grommets since the pick-up jobs going to be allot easier with the tine off.

Other Keyboards & Software Synths / Replacement keys for Hammond T116
« on: July 16, 2010, 02:56:16 PM »
I've got a box full.
Both diving board and waterfall.

Drop me a line if you need any.
or motors, start/run switches, scanners.

Or a PR-40 or HR-40 if anyone's interested.  :)

Other Keyboards & Software Synths / hammond C2
« on: September 04, 2009, 11:01:58 AM »
Run the organ for a while.

Recapping is a *very* heated topic.  Lots of flame wars on that one.

The service manual states a liberal dousing of WD-40 on the TG to remove oil lacquers that build up over time. There's a fair amount out there on the procedure, so I won't detail it here.

Also, mix 1/2 and 1/2 tg oil and lighter fluid and put that in the tg cups.   Breaks up the lacquer on the threads and bearings also.

Remember, you have 1 generator.  The drawbars only pull the sound from a particular tone wheel.  With only the 16' draw bar out, run a chromatic scale.  Determine the actual wheel/wheels out.   I'll try to find the generator map that will tell you which one maps to which key.

Parts, Service, Maintenance & Repairs / why do pickups go dead?
« on: August 24, 2009, 01:05:58 PM »
I want to know why the hair thin wire lead always breaks at the start of the wind, not the end!

I have had success (although limited) scraping the wire, put a bend on it and make a short jumper to the post.  Can be done on a Hammond too.  Its just really tough.  But if its already gone, nothing lost.

The Wurlitzer Electric Piano / Wurlitzer 145B ?
« on: August 24, 2009, 01:01:55 PM »
Nice find.
I think there where different versions of the 145

I have a 145 with the volume,trem,headphones and lamp on the metal cover above the cheek block, not on the cheek block.

It also has a different tube amp (different values, omitted resistors and caps, etc.)

I'd be interested to see the underside of the amp too if you open it up.

« on: April 21, 2009, 12:19:29 PM »

Other Keyboards & Software Synths / Roland VK-7
« on: December 11, 2008, 08:44:47 AM »
Quote from: "Jordy"
John Lord used Marshall, the overdrive from the Twin won't mix well with the Hammond

Well, Tom Coster played a Bill Beer chop through a twin and a BB Leslie.   The sound guy mixed the two signals at the board.
I only mentioned Lord because he is thought of most when it comes to a distorted, non-Leslie Hammond sound.

Other Keyboards & Software Synths / Roland VK-7
« on: December 10, 2008, 03:21:06 PM »
I think the Leslie sim sound OK only if in stereo. IE: not the twin.  (Unless you're going for the John Lord sound)

Mine is pretty good.  I've had some power supply issues.  The connectors break loose from the board.  Pain in the ass when you're in a solo and it reboots/power cuts out.  (been intermittent  since I got it.)

Keys are a little sloppy/lateral motion. I've had two break.  I wasn't doing any thing crazy either.   Just a run up (not gliz)  and *snap*!  They're $4 from Roland, so, not too bad.

All in all, I think  I'd get another one if I had to.  

Oh, one last thing.  Menu diving for chorus/vib selections (1,2,3) sucks.

Well,  a few things:
(unplug piano)
Pop the bonnet and check for loose/broken wires from the term pot.

Then, replace all the electrolytic caps.  Don't skimp and you won't have to do this again (or at least for a really long time).
(The one in this scenario could be 46, a 5uf,25v cap)

Nothing yet?
plug it in and test the voltages on the base, emitter and collector of TR3 which should be 15v, 6.6v and 3v.

Was the vibrato noisy before it went?

Preamps, Modifications & Upgrades / Preamp up for grabs
« on: October 23, 2008, 01:00:09 PM »
I'd love a pre-amp for my mark II.
Do you think you could send a pic?

Parts, Service, Maintenance & Repairs / Clavinet Repair
« on: October 16, 2008, 07:02:07 AM »

When I finally get around to it, I'm going to get one of these.  (They'll probably be out by then!)

For Sale / Parting out a MK II 73 Stage
« on: September 10, 2008, 03:57:06 PM »
Quote from: "matt.musicman"
Name rail w/ preamp

Preamp or just volume and bass?

Other Keyboards & Software Synths / Re: Synth Help
« on: August 22, 2008, 08:19:46 AM »
Quote from: "funkallero409"
im looking at maybe some sort of roland,korg,yamaha or nord synth

Well, those are the major players.  
Are you looking for actual samples or more VA type stuff?  
Does 'Original' mean you'd like to program the sounds?
Is this live or studio?

Seeing as you already have a controller, I'd go for a rack unit. I've always like the Roland JV/XV line.  You can pick some of those up, loaded with expansion cards for small money too.

Possibly by playing with:

Code: [Select]

Rhodes |----------> 1st Phase -----------> 1st Mixer channel
               |----------> 2nd Phase ----------> 2nd Mixer channel

But, as stated, the bi-phase has a few more parameters.  But, if you're willing, you can open the small stone.  I'm pretty sure the resonance is a trimmer (it is on the original Mutron Phase and Phaser II).  You switch out the trimmer with a pot and bring it to the surface.

The Fender Rhodes Electric Piano / Prince on Jay Leno
« on: May 19, 2008, 08:40:54 AM »
Check these out!

The Fender Rhodes Electric Piano / Prince on Jay Leno
« on: May 19, 2008, 08:40:04 AM »
<edit> bad links</edit>

Buying / Buying a Stage MK1 73
« on: February 25, 2008, 12:57:15 PM »
$450 prices have seemed to have gone away for now.  They currently seem to be in the $600 range in Northern NE (MA,VT, NH) areas.

I've seen a few basket cases in that rage too.  
Complete rust buckets.

The Wurlitzer Electric Piano / Wurli 145
« on: February 22, 2008, 07:06:44 AM »
The amp has had someone's hands in it.  
Caps where there shouldn't be caps.  The speaker out wire to the line out.   No pilot.  Hmm, this is definitely a project.
Eeeek. I think I'm going to strip the amp and start from stock.  Possibly install a ground buss through the center to eliminate all these ties to ground all over the place.

While I'm at it, I'll probably pull the phono input, drill another hole and make an effects loop out of it.  Either that or hook up an old OrganMate reverb unit into it.  
Does any one have a pic of the amp wiring for reference?

The Wurlitzer Electric Piano / Wurli 145
« on: February 21, 2008, 01:45:08 PM »
Thanks for the pics Steve,
Mines a little differed.  All the knobs are on the front.

(pretty little beuty!)

How does one get on the yahoo group?
I've tried a few times, bu I get no reply back.

The Wurlitzer Electric Piano / Wurli 145
« on: February 11, 2008, 01:41:24 PM »
Does anyone have pictures of a 145.  I picked one up, but the knobs are different, the vibrato was not hooked up, no power switch and the neon was gone.  This has 4 holes in the face panel and nothing on the left cheek block.

On the plus side,  all reeds intact, pedal and and legs.  The amp had a broken resistor from the pick-up bar.  Viola!  Instant Wurli!  Now I just have to clean this up and give 'er a good paint job.

Other Keyboards & Software Synths / Leslie problems
« on: December 06, 2007, 04:15:57 PM »
As far as the varying volume on the manuals, the matching transformer could be shot.
Pop the lid on that baby!  

When in front, with the hood open, on the left side is a can about 4" in diameter.  Open that up.  There are 2 resistors and 1 ceramic cap (maybe).  I bet the lower manual's resistor went a-stray.

As far as the Leslie goes, the 760 is bi-amped.  The bass pot is actually on the bass amp board.  I have one if you need a replacement.  Otherwise, check the voltages on the amp itself.

I think I may still have a service manual for that one, too.

And if you don't know what I'm saying, than don't do any of what I just said.
Look up Dick West, The Organ Doctor.  He's down by Rochester, NH.

Other Keyboards & Software Synths / Value of Hammond M3
« on: November 26, 2007, 06:40:23 AM »
Make sure you use Hammond oil only.  Other oil will gum it up.

The M and L series seem to be a dime a dozen these days.  So as far as an investment, that price is high. As far as playing and enjoyment, go for it.

Also, the good thing about a Hammond: it can always be fixed and/or rebuilt. Even 70 years later. :-)

Parts, Service, Maintenance & Repairs / Cheek block - how do I remove one?
« on: November 23, 2007, 11:08:08 AM »
And, you finally get to clean out all the 'things' that have fallen in there over the last 30 year!

Other Keyboards & Software Synths / ARP OMNI...
« on: August 20, 2007, 07:30:18 AM »
You should know that tantalum capacitors cost a lot.
When voices (notes) start to bleed in, you will need to replace them.

Also, mark smart has the filter mod on his web site that really helps the synth section.
When the synth sections are on and the strings are off, if you place the synth/string slider on strings, the synth runs through the phaser.

I love these machines!

Preamps, Modifications & Upgrades / Dyno preamp copy
« on: July 03, 2007, 07:53:36 AM »
Hey jazzguitarboy (jgb?),
If you don't mind:

What did you use for transistors? The bf245 or something else?
Whats your signal path?
harp->dyno pre->amp?
Are you using a wall-wart for power?

I'm thinking of building one of these and would love some input before I start.


Buying / W o w.
« on: June 22, 2007, 08:11:09 AM »
That is a really nice case.

I think I've got a Dolphin around here somewhere too.  They are approaching 'vintage' status.


The Wurlitzer Electric Piano / 200 series amp
« on: June 22, 2007, 08:08:35 AM »
Testing voltages revealed only 115v on the pick-up rail.  Tracing backwards (which, in retro-spec, I should have started *at* the power supply) showed low voltages across the entire amp.  Current (pun intended) culprit, the 2 .22uf 250v caps at the power supply.

The Wurlitzer Electric Piano / 200 series amp
« on: June 12, 2007, 06:49:32 AM »
To continue 'one hand clapping':
The rectangular .68 5w resistor was reading 2ohms.  Replaced that.  The 500 50v caps and 100uf 50v cap the  should be here soon. I think they're the offending culprits .

More to follow once the mouser order arrives.

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