The electric guitar revolutionized popular music a half-century ago, and continues to be its greatest tool of expression. Before this, instruments were mechanical and acoustic alone. Now, through electronic technology, our electrified beat enthralls the world with harmony and joy!


Howard (Mick) Davis


Terms of Service - BELOW

Is Your Pedal Worth Fixing or Upgrading?

Reconditioning and Value

Need an Alignment?



How Loading and Cables Affect Your Sound and What to Do About It

All About BYPASS

How Guitar Effects Work

Distortion: the Good, the Bad, and the Ugly

Sound and Power

Tubes vs. Solid State

Stones, Clones, and Muffs

Who I Am and What I Do - plus the secret to happiness!

Links to Good People, Information, Resources, and Products


Guitar Pedal Design, Repairs, and Custom Modifications

For information on ANALOG CIRCUIT DESIGN - ELECTRONICS ENGINEERING SERVICES, please send an inquiry with technical details to:

I do not sell schematics or parts.



No serviceperson can quote you a fair price for a repair without first finding out exactly what is wrong, what parts will be needed, and how much labor will be required. Any estimate given without this information being known is a "guesstimate" - and often is higher than necessary. If you are given an estimate without any preliminary diagnostic work, should the actual repair only take five minutes, many service people will still charge you the full guesstimated amount. Some will give you a "lowball" guesstimate to get your business, then charge more than you expected when the work is done. By doing diagnostic work prior to giving an estimate I protect you from such nasty surprises.

A bench fee is normally charged for the diagnostic work required to determine what is wrong. This is fair compensation for that work, and is credited towards the total parts and labor cost if you decide to go ahead with the repair. If desired, I can give you a free estimate based on the problem as it is described to me, but it must be understood that without any diagnostic work this estimate may not be accurate. For custom redesign/modification work on Electro-Harmonix pedals in good working condition, I can quote an exact price for the job.

Having been the Chief Design Engineer for Electro-Harmonix for five years and presently a consultant for the company, I prefer to work on EH products, many of which I designed. I do however repair and upgrade most non-EH guitar pedals for which the necessary technical information and required parts are available.

Feel free to e-mail for a list and description of the custom mods available for your Electro-Harmonix pedal:

may be physical, or electrical, as from the application of excessive voltage. TAMPERING includes a previous unsuccessful repair attempt, or any undocumented modification whether successful or not. Pedals with these conditions require far more time and labor for test and diagnosis, and I must charge accordingly. In some cases such pedals are damaged so badly that it would cost more to fix them than they are worth. In cases of damage or tampering the diagnostic bench fee is higher than otherwise, but of course is fully deductible from the total parts and labor cost if you decide to proceed with repair. This charge applies however even if repair is not feasible, and must be paid in advance in certain cases.

I do not service digital equipment; analog pedals only.

Some manufacturers use construction methods that make repair or modification difficult or impossible. In general, units with double-sided PC boards and/or surface-mount components are among these. If sent a unit on which repair or modification is impractical, I charge only a basic bench fee plus return shipping/handling cost.

There are a few Electro-Harmonix products I do not service for various reasons. Either I did not design them and the technical documentation is poor, parts are unavailable, or they are difficult to work on and the labor charge would be more than the unit is worth. These include: Microsynth, Bass Microsynth, 16 Second Delay, Stereo Memory Man with Hazarai, Holy Grail and all other DIGITAL pedals, the Russian-made Sovtek reissues, and most vacuum tube-based pedals.

Occasionally I am sent a pedal that has nothing wrong with it, the problem actually being in other equipment it was being used with. Sometimes a problem is intermittent, and cannot be detected until it shows up again. In such cases, a bench fee plus shipping/handling is charged, and the unit is returned as-is. The bench fee is FULLY DEDUCTIBLE from the parts and labor charge for any repairs done on the same unit for the same problem within 30 days from the date of return shipping.

RECONDITIONING: If needed and desired, I can cosmetically recondition (clean, touch up paint scratches, and relacquer) the box of any Electro-Harmonix guitar pedal so it looks almost like new when you get it back. Reconditioning, like custom mods, can raise the resale value of a pedal considerably. Deep scratches, bends, dents, and deep rust staining in the steel cannot be fully restored.

If you send a pedal with a good 9V battery, it is returned with the same battery. If the battery is weak or dead, it is replaced with a new battery for which you will be charged, unless you tell me not to. If you send a pedal with no battery, it is returned without one unless you tell me to install one.

My turnaround time is short. The work is usually completed within a few days of receiving your pedal. Unless agreed otherwise beforehand (as for a diagnosis and estimate), receiving the pedal will be considered consent to proceed with the work. Unless requested otherwise, please send no payment until you are billed after the work is completed.

For FAST SERVICE: Please pay PROMPTLY with a POSTAL money order, Western Union money transfer, CERTIFIED check, or CASH. I will then ship your pedal within a day or two of receiving payment for the work. If you are in the New York City area, you can contact me to arrange a dropoff and pickup, thus saving yourself the shipping time and costs both ways. Please email me the Western Union money transfer control number if you pay that way.

For SLOW SERVICE: Pay by personal or company check or a non-postal money order. There will be A DELAY of TWO TO FOUR WEEKS until payment clears the bank before shipping.

For INTERNATIONAL SERVICE: ONLY a Western Union money transfer, a CERTIFIED check ON A USA BANK, or US currency can be accepted. I will then ship as soon as payment is received. A Western Union money transfer is fastest, and is strongly advised for international payment. Please email me the money transfer control number to expedite completing the transaction.


Shipping is usually the biggest time-consumer in the repair cycle. I ship by DHL Ground domestically and use First Class International or Priority International mail for foreign shipping. I insure shipments when requested to or when value warrants it, but there is a service charge for filing a claim.

The US Postal Service can be slow and unreliable, so I recommend that you SHIP TO ME by UPS, DHL, or Fed Ex - NOT the USPS. I can take no responsibility for shipment delays, loss, or damage, which occasionally occur, mostly with the USPS.


Please pay promptly when billed. Should payment not be received within one month of the billing date, a STORAGE CHARGE of $2.00 per week will begin to accrue. Should a bill remain unpaid six months from the billing date, the unit will be considered ABANDONED PROPERTY and WILL BE SOLD or DISASSEMBLED FOR THE PARTS, unless previously agreed otherwise with the sender.

I warranty all repair work, parts and labor, for 30 days from the date of shipment to you. This warranty is VOID if any damage, tampering, attempted repair, or modification has occurred subsequent to my delivery to the shipping carrier.

On custom redesign/modification work, I GUARANTEE SATISFACTION. I am one engineer that is proud of his reputation, and will live up to what you have a right to expect of me. If your custom-modded guitar pedal does not sound or operate as you wanted it to, you get one FREE service return. Return it within 30 days of my shipping date and I will redo the job, FREE. All you'll pay is a shipping/handling charge.

Howard Davis, EE
207 Ocean Parkway #3G
Brooklyn, NY 11218

Please contact me prior to sending any pedal to be certain I can fix or mod it.ENCLOSE with the pedal:
1) A detailed description of the problem needing repair or of the mods desired.
2) Your full name and return shipping address, and email address.
I will notify you by email the day I receive your pedal, when the work is completed, and upon shipping it back to you.