Wurlitzer 200a - Reducing noise and Distortion - Part 1

[@ethankingcole]

You exude patience, my friend. I'm trying to decided whether to take this on myself on my old student model.

[@deancoyle]

Owning any vintage instrument like this requires patience....when you depend on it most it will test that patience!

[@audiogramastudios]

You finally managed to get rid of that noise.

[@xinsertusername]

I love your videos, keep it up. Good luck with the long term Electric piano build too.

[@deancoyle]

Thanks, will do, my next video will be on that!

[@carl7lamoureux]

i have the same metallic noise on mine. can’t wait to try this. thanks!

[@deancoyle]

Good luck, let me know if you managed to get rid of that noise.

[@bencheshire]

I have a Warneck amp and mine doesn't have the metallic ring, but it does have that background noise that yours has on the fixed note

[@deancoyle]

I would contact Warneck - I am sure they will help you and are the best people who know their amps. Hope that helps.

[@TheSteinwayGuru]

Hi Dean Could you please make the part 2 of this video? I could certainly need a way to fix that ground floor noice coming from bad power supplies! Thank you!

[@deancoyle]

I will bump it up the list, I need to move the power wires and redo the grounding. As piano sits in my studio just plugging it in turned off creates a huge amount of ground noise....we can do better. Which model do you have?

[@bjd7703]

I've noticed matching bands of sound in the 7-10 khz range directly above many of the notes of my Wurli. Wondering how normal that is. I looked at your note comparison around 6:12 and saw the clean note has nothing above 3.5 khz, while the first note has many bands all throughout the spectrum to where the sample cuts out at 16khz. In my case, I did notice that these sounds are mechanical in nature since they sound even with the instrument off. Curious if you know what that might be?

[@deancoyle]

Hi That is a good question. I agree though there shouldn't be much high frequencies generated. Usually the Fourier transform gives two peaks. The fundamental and an octave above for a single note. I am not an expert but feel free to email a recording and ill do my best to give my opinion. The best place to ask this is one of the facebook groups - facebook.com/groups/516634768819682 or facebook.com/groups/516634768819682 ( Ah i see you have already posted there) But those group have some real knowledge - though do also take it with a pitch of salt as there a few ways to do most things. Looking at the post of a squeak during pedal release, I would be tempted to press with my finger (if it is safeto do so) each of the pivot points and see if that alters the noise. If you find which one it is -if its metal on metal drop a small drop of oil/grease (oil not wd40). If wood - does it need felt need replacing? Please do keep me posted on how you get on this this! Cheers! Dean

[@JulianChown]

I've got this fizz too and have also replaced the capacitors throughout with the VV kit etc, and still have the same noise. You mentioned removing resister 58. Is that all that needs to be done or does the circuit need rewiring as am assuming that just removing it will stop the current running through.. ? I appreciate your knowledge on this. Thank you. Great videos BTW!

[@deancoyle]

Here is the schematic, in the top centre there is a star that explains that the resistor needs to be chosen to bias the amp. And which points to measure to ensure that the amp is set up correctly. I think I was lucky that removing that resistor got my amp in the correct range. The large caps in this amp hold voltage for a long time, so please be careful when working on this. www.bustedgear.com/images/schematics/Wurlitzer_200A_series_schematics.pdf Apologies if I go too basic - but for anyone else I think it may be interesting to know how and what biasing is. The amp works by taking the positive voltage of the signal and amplifying that, it also takes the negative voltages of the signal and amplifies that separately. These are added together. Due to variances in components the amp needs to be balanced to ensure that each side it getting amplified by the same amount. If one side is getting more amplification, then it will create a DC voltage offset. This is what we are measuring and setting to zero when we bias. Good luck. Its hard to offer the best advice on youtube comments, I recommend posting question on the Wurlitzer facebook group. There are people there who know a lot more that I could. Good luck :-)

[@lundsweden]

I kinda like the noise and grit, its character is'nt it?!

[@deancoyle]

We are keeping to good distortion and grit, I agree though we don't want this sounding like a piano!

[@cannadineboxill-harris2983]

Hello There my name is Mr Cannadine T. Boxill-Harris, how have you been Keeping up to Lately, I was wondering if you need to do the other way round Lyrics in you’re own word Lyrics but sing it differently in the original Extended background Versions of those Particular song’s By Andrew Gold and The Korgis, Never Let her Slip Away and Everybody got to learn Sometime, why don’t they just Replace the Synthesizer String Sound to a Two Musette Accordion’s sounds and make this Musette sounds for the Two Accordion’s 3 to 6 and a half times more Deeper then the Original Synthesizer String Sound that they have this Particular song called Everybody’s got to Learn sometime and also Replace the Xylophone Sound to a 17 Times More Deeper Chime Bell or Even a 24 Times More Deeper Still Drum Sound, Because it is Still one of my Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Very Favorite Song’s Ever Since I was about 10 Years of Age Thank You and I Like 👍 you’re Remixing and make you’re singing 5 and a half times more Deeper XXXX