Set of 3 Recapped Refurb'd Calibrated dbx 303 Cards For Eventide H910 H949. DH

Matched set of THREE Refurbished dbx 303 Cards for Eventide H910 / H949 Harmonizers. Many times when these products fail, the dbx cards in the units are faulty. They can also be used in DIY effects gear projects.

Note: this listing is for a set of 3 cards. For Marshal  models we also have sets of two cards (one encode, one decode) available in a separate ebay listing.

Eventide and Marshall models used dbx 303 Type A cards -- these are the early version (identified by the 4 vertical trimpots on each card) and they are very unreliable. When we encounter gear with these older cards, we dispose of them and install later version cards like the ones in this listing.

This card set is the result of a service regimen that we have developed for servicing Eventide and Marshall gear. The cards for sale have been recapped, fully serviced and calibrated, adjusted for minimum distortion, and grouped in matched sets of 3. This is a very labor intensive process.

The photo shows 3 typical cards. When we test and QC these cards we mark then ENCODE or DECODE for best matching. You'll receive one enode card and two decode cards. The cards you receive from us may differ slightly in appearance, and may be Rev. B, C, or E cards, but they will be exact replacement cards, in excellent condition.

If you’re a DIY’er, you’ll need to study a schematic to understand jumpering and options for the use of these cards. All connections are via a 12 male Molex pins. The card requires +/- 15 volts DC. The dbx system has the capability of doubling dynamic range in outboard gear and recording systems. If you have an analog system with a dynamic range of 40 db, the dbx system will increase it to 80 db. Thanks to the ingenious RMS Detector circuit, accuracy of the dbx system does not require any kind of matching or precise calibration of encode and decode levels. We will include schematics upon request.

Note: these cards were designed by dbx to be used in noise reduction systems for tape recording. Stephen St. Croix of Marshall Electronics developed an improvement for these cards that optimized the VCA filters and RMS Detector pre-emphasis circuits for use in outboard gear. This 303 card version was used in all Marshall Time Modulators and Tape Eliminators. These updated cards work great in Eventide gear but can't be mixed with original Eventide 303 cards. If you';re replacing cards in an Eventide product you'll need to replace all 3 at the same time.

These cards sets include a service bulletin with background info and install tips, and a sheet that identifies all the calibration trimmers. If you also want a copy of the schematic, please request it when you order.

Studio Electronics Inc. has served the pro audio industry since 1981.  We run one of the best equipped service repair shops in North America, with a vast parts inventory and extensive library of documentation on all types of audio gear -- from the 1950’s to present day.  We are an authorized service center for several manufacturers, and offer expert service on all kinds of vintage pro audio gear including EMT, UREI, Pultec, Eventide, API, Neve, Marshall Electronic, and many others.  We’ve installed over 250 studios -- everything from small project studios to large scale projects for firms like Warner Brothers and Disney.  We’re proud of our reputation in the pro audio community.  You can get lots more info about us by visiting our site at www.studioelectronics.biz.

Thanks for looking!