Home - Hours - Services - Contact us - About us - Directions - Links & Brands serviced - Estimate Policy - Blog
All Service Musical Electronics Repair
Fast Reliable Service At Reasonable Rates
34 Years Experience - Free Estimates With Repair - 90 Day Warranty
Factory Trained & Authorized For Most Brands
The Shop is open Monday through Friday 10am to 6pm
Saturdays 10am to 4pm ..... we are closed Sundays
617 SE MORRISON - PORTLAND, OREGON 97214 .... 503-231-6552
Fast turn around .. rush service available
All Service Musical Electronics Repair has been providing quality service on all types of electronic musical equipment since 1981. We repair new, used, and vintage musical gear. We are factory authorized for most brands. We do amplifier repair (this includes both tube amplifier repair and solid state amplifier repair) , CD player repair, CD recorder repair, electric guitar repair, effects repair, electric & electronic keyboard repair, microphone repair (standard & wireless microphone repair), multi track repair ( analog & digital ), mixer repair & sound board repair, power amplifier repair, speaker repair, stereo repair, synthesizer repair, Tape recorder repair (cassette recorder repair & reel to reel repair) turntable repair, record player repair & DJ equipment repair. Basically if you can plug it in and make music with it we probably work on it.
Electric guitar repair
For most Guitar repairs we recommend taking the guitar to a shop that specializes in that type of repair such as The 12th Fret guitar shop. Some of the electronics in some modern guitars are beyond the capabilities of most guitar shops. The line 6 Variax would be a good example of this. In these cases, as well as in the case of active guitar electronics, or built in pre amps we will usually be a better source for repair. - Back to top
Guitar amplifier repair ( Tube & Solid State )
We have been doing electronic repair and modifying of guitar amps for many many years. We are well versed in both solid state amplifier repair and tube amplifier repair. We stock most common tube types for installation in repair of tube amps and sell them over the counter as well. If you need an uncommon tube we have sources for most any tube used in a tube amp. So whether it be a solid state amplifier repair, a tube amplifier repair or a modification of either a solid state amp or a tube amp we have the knowledge and experience to help you out.
On the subject of tubes. Yes there are some differences in sound between different types of tubes. For instance as a general rule Groove tubes provide a much harsher sound than say JJ tubes. Most people including myself are not a big fan of the harshness of groove tubes and prefer the JJ', or Tung-Sol tubes. However aside from the harshness of groove tubes I find that most of the other main stream brands are similar in sound quality. The one place I find a big difference is reliability.
The tubes we use here at the shop are all pre tested and burned in for maximum reliability and sound quality. There are of course NOS tubes and other rare tubes that have a nice tone and a hefty price tag, but in most situations and for most people they are not worth the hefty price tag. We will of course use any tube that you desire in your tube amp repair, but in most situations find that our customers are very pleased with our choice of tubes for their tube amp repair. - Back to top
Electric keyboard repair, Electronic keyboard repair, Synthesizer repair
Wow keyboard repair. A lot has changed over the years and we have been here for all of it. We have been doing keyboard & synthesizer repair since the days of the Arp's, Moogs, Sequential Circuits and the Oberheims. In fact we were factory authorized for all those brands. Back then you could pretty much count the different makes and models using just your fingers & toes. These days you would need to borrow the fingers an toes of a couple hundred friends to keep track of all the makes and models that have been put out since the early days.
As far as electric and electronic keyboard repair goes .. we work on it all, and have the expertise that can only be gained from our many years of hands on experience with electronic keyboard repair. Of course we still work on all the old synthesizers. So if you need a keyboard repair or a synthesizer repair done and want that keyboard or synth repair done by people with knowledge and experience in the field of keyboard repair. Look no further because you have found the right place. - Back to top
Microphone repair for us is pretty straight forward. In most microphone repairs the problem is either in the wiring , or it is a bad element. Both of which are pretty easy to locate in the course of the microphone repair process. When you get into phantom powered microphones there is a small amount of electronic circuitry sometimes involved, but in the scheme of things still pretty basic stuff for our tech's. We of course repair wireless microphones as well. For more on that type of microphone repair please scroll down the page. - Back to top
Multi track recorder repair
We repair all types of multi tracks. We repair tape based machines such as cassette recorders and reel to reels. We repair digital based systems such as hard disk recorders as well as multi track recorders that record to cd's and zip drives. We have been performing repairs on cassettes and reel to reels all along. We have been performing repairs on digital based systems since they first showed up on the scene. So if you need electronic repair on any type of multi track recorder. We can help. - Back to top
Mixer repair & sound board repair
We have been doing electronic repair on sound gear for many many years as well. We do electronic repair on analog and digital based systems. Mixing board repair and sound board repair is pretty basic stuff for us here. Of course it gets a bit more interesting when you get into the repair of the automated digital mixing boards, but still no problem for us here. So whether it be a two channel microphone mixer, a larger 32 by by 8 mixing board, or an automated digital mixing board that needs repair. We can get you up and running again. - Back to top
Power amplifier repair
Power amplifier repair, here is another place things have changed . No longer do you need three men and a little boy to get your 1200 watt power amplifier into the shop for repair. Most of this is due to the advent of digital switching supplies which have allowed manufactures to eliminate some of the transformer bulk. Which is where most of the weight comes into play in a power amp. Of course if you do have and older heavier power amplifier we will be happy to help you carry it into the shop from you car :) While most power amplifier repairs involve solid state units there are tube power amplifiers out there as well. Whether your electronic repair needs involve a solid state amplifier or one of the rarer tube units we have the knowledge and experience with power amplifier repair that you need. - Back to top
We repair all types of speaker enclosures here from pro gear for the clubs and stages to home stereo enclosures for your personal listening pleasure. So whether you speaker repair involves rewiring, crossover repair, or replacement of the drivers we can help. - Back to top
Stereo repair & CD player repair
We repair all makes and models of home stereo's and CD players here and I have personally been doing stereo repair since the mid 70's a lot has changed over the years but a lot remains the same as well in that our customers rely on us to get the best sound possible in the course of repairing their stereo equipment. We of course have been providing CD player repair since they first came out on the market.
Need repair on older home stereo equipment? No problem, some of the older equipment has better sound than a lot of what is currently available and is well worth repairing. Of course when we do a home stereo repair on older equipment parts do become an issue from time to time, but we have a lot of sources and can usually dig up what we need to get your stereo repair accomplished. So old equipment or the newest thing... We can repair it and repair it right. - Back to top
Turntable repair, Record player repair & DJ equipment repair
I have been repairing turntables since the mid 70's and DJ equipment pretty much since it hit the club scene. So whether it be a turntable repair for your DJ set up or a turntable repair for your home stereo system we can repair it right. We can of course provide you with electronic repair on any of your other DJ equipment such as mixers and CD players as well . - Back to top
Wireless system repair
Be it electronic repair on a wireless microphone, or a guitar wireless system we have the experience and the equipment to perform your electronic repair for you. In fact we may be the only shop of our kind in Portland with a two way radio service rf generator / monitor that we purchased for the sole purpose of properly servicing wireless systems. So if you need wireless microphone repair or wireless guitar system repair bring it to someone who has the knowledge and the proper test equipment to do the job right. - Back to top
We of course repair other equipment other that what has been discussed on this page. Basically if you can plug it in and make music with it. We probably work on it
Home - Hours - Services - Contact us - About us - Directions - Links & Brands serviced - Estimate Policy - Blog
Tube amplifiers seem to have garnered a lot of mystique over the years. I hope to be able to sort from of the fact from fiction for you here.
Do tube amps sound better than solid state amplifiers?
In my opinion … yes whether they are a guitar amp, a bass amp, a home stereo amp, or the more rare tube power amp they have a warmer sound, great dynamics and a more pleasant breakup than a solid state amp. The downside of course is the higher maintenance cost.
How often should I change my tubes?
If you are using your guitar amplifier or bass amplifier say 4 hours a day 5 days a week = 20 hours per week. Then you should change your tubes every 6 months if you want to maintain the best sound quality. A year ( approx 1000 hours ) should be the absolute maximum on a set of tubes. Yes, they may still light up and produce sound, but it will not be a very good sound.
Sticking keys on Yamaha keyboards
If you have a Yamaha keyboard with sticking keys, stuck keys, or sluggish keys there is a possibility that you can have a new keyboard installed in your unit for just the cost of the labor.There are way too many models of Yamaha keyboards affected to list them all here. So if you have a Yamaha keyboard with sticking keys Select the contact link on this page and then click our email link to email us the Model and serial number of your Yamaha keyboard. We will then check with Yamaha to see if your Yamaha keyboard qualifies and email you back the results. By the way you do not have to be the original owner to take advantage of this.
My new tubes make my guitar amplifier sound so much better; surely this brand must be better than what I had.
Consider the following scenario to illustrate why people think the tubes that they recently had installed in their amplifier whether it be for a guitar amplifier, a bass amplifier, or any other type of tube amplifier are so much better than the brand they had in there before. (In other words how tube rumors get started)
Most people do not change their tubes until they have a repair issue. We find that on a average most tube amplifiers we take in for repair have not had their tubes changed for 2-3 years ! After 2-3 years any set of tubes are not going to sound good in your amplifier. So pretty much no matter what tube is installed now will sound so much better that what you had that you will think the new tubes are best thing since sliced bread. In other words it is not so much the brand of tube that you installed, but the fact that you changed the tubes at all that made the amp sound so much better.
Where should I buy my amplifier tubes.
Beware! There are a lot of sources for amplifier tubes and name brand alone does not assure you are getting a quality tube.
You should as a general rule avoid the internet tube warehouse type places because often the tubes they sell are seconds of inferior quality. The initial cost may be cheaper, but the repair bill when they take your amp down will not be. The old adage of you get what you pay for defiantly applies here!
Music stores that sell tubes usually sell what they can buy cheap, sell cheap and make a good profit on. Their choice of what to carry is often not based on careful research. For this reason most music stores are not a good source for tube purchases & information about tubes.
Even some repair shops unfortunately will sell cheap inferior tubes because they feel their customers will kick about the price if they don’t do this. What a good repair shop will do is sell the best quality most reliable tube they can obtain at a reasonable cost to the customer. If this means sacrificing some business so be it, because a good repair shop will realize that quality and long term reliability will save the customer far more in the long run than the small amount of money they would save initially by using cheap inferior tubes!
Sorry if it sounds like I am a soap box here, but I am very passionate about providing quality service and reliable products to my customers.
I will never sell or use something at my shop that is not of good quality, poor quality parts make poor quality repairs, which makes for amplifiers failing in the middle of a gig …and that’s no good at all.
What Brand of tubes should I use?
Here is a subject that has a lot of misinformation associated with it.
There are some differences in sound between different brands of tubes you may choose to install in your amplifier. For instance as a general rule Groove tubes tend to provide a much harsher ( edgy ) sound particularly in guitar amplifiers, less so in bass amplifiers than say JJ tubes. However aside from the harshness of groove tubes I find that most of the other main stream brands are similar in sound quality. The one place I find a big difference is reliability. The tubes we use here at the shop are all pre tested and burned in for maximum reliability and sound quality. The JJ tubes that we used to prefer to use in repairs have recently dropped in reliability so we have switched to using tung-Sol tube. So far we have been having excellent results with them in all types of tube amplifiers. There are of course NOS tubes and other rare tubes that have a nice tone and a hefty price tag, but in most situations and for most people they are not worth the hefty price tag. When we do a repair we will of course use any tube that you desire for your tube amp repair, but in most situations find that our customers are very pleased with our choice of Tung-Sol tubes for their amp repair.
Almost every piece of equipment be it a keyboard, a mixing board, a guitar amplifier, or an effect unit has some good old fashioned potentiometers (Pots) that at some time in its life will need to be cleaned.
Cleaning controls is a pretty simple process; it is the getting to the controls to clean them that can sometimes be complicated.
Fist a warning about faders or slide controls.
Do not clean them unless the absolutely need it, and only use special fader only cleaner, and finish up with some fader lube. If you use anything else the controls will become so stiff you will barely be able to operate them. Even when you use the proper products on them thy will still be stiffer than they were before they were cleaned. That is why I advise not cleaning them unless it is necessary.
Fader controls unlike rotary controls can be cleaned without taking the equipment apart. You just spray the fader cleaner in the slot that shaft rides in that the knob it attached to. Then work it back and forth over its entire sweep several times, apply some fader lube in the same way, and you are done.
Cleaning rotary controls requires disassembly of the unit being worked on. Once you have accesses to the controls the process is pretty simple. Most, but not all rotary controls have a slot or other opening on the back, or side that you can spray your preferred brand of control cleaner into.
Clean the controls one at a time, do not spray them all first and then go back and rotate them as it is not nearly as effective as spraying the cleaner into the control and then immediately rotating it vigorously several times over its entire sweep. Here at the shop we generally clean each control twice, the reason we do this is if you have to spend several ours on cleaning the controls on say a mixing board that you had to pull all the circuit boards on to get to the controls you sure as heck don’t want to have to pull it all back apart because you were not thorough in your first attempt.
A few additional notes on control cleaning
When cleaning controls on keyboards, and synthesizers be careful not to get any control cleaner in the area of the keyboard display, or the keyboard contacts.
When cleaning controls on guitar amplifiers try not to get any cleaner on the tubes or any of the power resistors.
When cleaning controls on mixing boards there will generally be a lot of cleaner run off after cleaning the controls. Put the board on some old newspapers or something else absorbent and let the cleaner drain off before you put the cover back on it. It generally helps to do this with the mixing board left sitting in a variety of positions to facilitate draining of the excess cleaner out of the mixing board controls.
All speakers as most of you know have a positive and a negative terminal. If these terminals are hooked up backwards the speaker will still work, and if only one speaker is used you will probably not even notice the speaker is out of phase.
The problem comes into play when using more than one speaker cabinet, or multiple speakers within one cabinet.
If one of the two speakers is hooked up backwards then the two speakers will be out of phase and when played together they will sound very thin as they are essentially cancelling each other out. This is because one cone is moving out while at the same instant the other is moving in.
In cabinets with multiple speakers it is also important if you have to replace a speaker that you match it up as closely as possible to the original, or replace both at the same time. The reason is if the two speakers have different efficiencies and cone materials then the cones will move at different rates which creates another type of phasing issue.
When hooking speakers up you cannot always rely on the markings on the speakers. I have seen many speakers over the years that the positive & negative leads were labeled backwards.
The good news is that it is extremely easy to check for phasing issues and proper speaker polarity, all it takes is a 9 volt battery.
With nothing else hooked up to the speaker touch the positive lead of the battery to the positive lead of the speaker, and touch the negative lead of the battery to the negative lead of speaker. As you are looking straight into the front of the speaker it should move towards you.
The motion when the speaker pops when you hook up the battery is what you are looking for. . Do not leave the battery hooked up for more than a few seconds at a time.
When doing this with a cabinet you can simply use the input terminals of the cabinet to perform this test.