Recent Posts

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The Wurlitzer Electric Piano / Re: 200a cheap amp replacement
« Last post by Jenzz on February 26, 2021, 05:53:55 AM »
Current amp has some nasty crossover distortion, my tech couldn’t find the problem so it’s still there.

Hi .-)

Always check for proper bias. If its too low, you will get this crossover distortion.

Jenzz
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Thanks cinnanon!! That's super helpful.
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The Wurlitzer Electric Piano / Re: 200a cheap amp replacement
« Last post by pianotuner steveo on February 25, 2021, 02:15:27 PM »
Don't forget that part of the uniqueness of the original Wurlitzer amp is the roughly 150vdc that it creates for the reed bar. A generic amp will not do this. The Wurli is not passive like a Rhodes.
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The Wurlitzer Electric Piano / Re: 200a cheap amp replacement
« Last post by Abraham on February 25, 2021, 08:59:07 AM »
Current amp has some nasty crossover distortion, my tech couldn’t find the problem so it’s still there. Line out is just fine, only speakers and phones are distorted. I usually plug any guitar amp or powered speakers to line out and it plays just fine. I’d go with original amp since it doesn’t affect recording, but I’d like to play the instrument standalone as intended, just out of those speakers. A properly refurbished original amp will do just fine (and keep the instrument 100% original).
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The Wurlitzer Electric Piano / Re: 200a cheap amp replacement
« Last post by drpepper on February 25, 2021, 07:51:06 AM »
Just out of interest what is wrong with the current amp?
If you consider your wurli as an investment you might deprecate the value more than you save going cheap.
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The Wurlitzer Electric Piano / 200a cheap amp replacement
« Last post by Abraham on February 25, 2021, 06:16:56 AM »
Sorry but I couldn’t justify myself spending $400 plus shipping on a wurlitzer replacement amp... You can find TDA based amp boards on Aliexpress for cents doing pretty much the same job with power enough to drive those little speakers... you don’t even use the amp for recording, so why not?

I mean, I’m not criticizing such prices, it’s nice to have a direct replacement if you can afford such investment. Also, I understand design and production of such implies costs beyond my knowledge and they have a limited market to make it profitable. Just to make clear, I’m not saying those amps are overpriced, I’m just saying I can’t afford one.

So, did anyone try such DIY alternatives? I know about the “free wurli” project, but it’s from years ago. Build cost estimation was 120€ then, I think nowadays we could do it cheaper, I could be wrong though.

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the jack itself was disconnected from the port/hole/cutout in the block.
This really isn't an issue for anything other than proper grounding (unless you have some wires crossing or touching something they shouldn't be).

It sounds like you have some loose connections or someone has had their hands in there.  I would study the schematic until it makes sense, and then troubleshoot.

As a quick reference, when nothing is plugged into the cheekblock headphone jack, the speaker signal passes through the jack and to the positive terminals on the speakers.

When anything is plugged into this jack, the signal is sent two ways:
1. Through an 8 ohm 5 watt resistor (for loading the amp) and then to the negative terminal of the speakers.
2. Through a 470-ohm resistor (this resistor may only be present on 200 models) and then to the tip of the jack (to be sent to headphones).

Take a moment to research schematic symbols and it will help you out tremendously.
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If anyone has a picture of what an intact headphone connection looks like from the inside, please post a pic! Thanks!
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I opened up the left keyblock where the volume, vibe, and headphone jack is located and found that the jack itself was disconnected from the port/hole/cutout in the block. Not sure what the next step here is but at least the problem is isolated.
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The Fender Rhodes Electric Piano / Looking for a Mark II suitcase 73 name rail.
« Last post by Schtom on February 23, 2021, 01:22:56 PM »
Looking for a Mark II suitcase 73 name rail.  If you have one, let me know what your are wanting for it.  If anybody can point me in the right direction of who to call that might have one, I'd appreciate it.
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