Electro Voice SBA-760

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   Got a couple of these.  Drivers are excellent as are the cabinets.  Both have bad amplifier plates.  Have managed to sort out some issues with one of them, however, what is the deal with trying to get schematics for these things.  They are not terribly complex, but it would certainly make life a little nicer if I had schematics.  These are I believe obsolete, but still not available.Any helpful suggestions.

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IFixStuff Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 07 November 2017 Location: Herndon, Va Status: Offline Points: 10	Post Options Post Reply Quote IFixStuff Report Post Thanks(0) Quote Reply Topic: Electro Voice SBA-760 Posted: 07 November 2017 at 5:08pm
	Got a couple of these. Drivers are excellent as are the cabinets. Both have bad amplifier plates. Have managed to sort out some issues with one of them, however, what is the deal with trying to get schematics for these things. They are not terribly complex, but it would certainly make life a little nicer if I had schematics. These are I believe obsolete, but still not available. Any helpful suggestions.

IFixStuff Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 07 November 2017 Location: Herndon, Va Status: Offline Points: 10	Post Options Post Reply Quote IFixStuff Report Post Thanks(0) Quote Reply Posted: 07 November 2017 at 5:37pm
	Oh, apparently they were also sold as Dynacord SUB 800A. But still no service manuals or schematics.

IFixStuff Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 07 November 2017 Location: Herndon, Va Status: Offline Points: 10	Post Options Post Reply Quote IFixStuff Report Post Thanks(0) Quote Reply Posted: 11 December 2017 at 6:31pm
	So, even without schematics, I now have one working Subwoofer plate, and the other one powers up, but no sound, and some iffy status light indications. Now, it could get interesting. Since I have one working unit, I can probe around with my trusty DVM and scope and look for differences. Might yet end up with two functioning units. If I had schematics, they would both be fixed, but EV and Dynacord are very secretive type folks.

Justmike612 Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 07 December 2025 Status: Offline Points: 1	Post Options Post Reply Quote Justmike612 Report Post Thanks(0) Quote Reply Posted: 07 December 2025 at 12:05pm
	Did you ever find schematics for these? I just picked one up, it has this sort of loud tick noise every few seconds. I opened it and suspect a few of those big MOSFETs are bad. They are heating up quickly with no input

d.antonis Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 04 January 2009 Location: greece Status: Offline Points: 67	Post Options Post Reply Quote d.antonis Report Post Thanks(0) Quote Reply Posted: 08 December 2025 at 11:07am
	I have a SUB800A DYNACORD, i see that it must be the same module as the electrovoice one. I got it 2nd hand with problen on the woofer, a bit warped voice coil, must send it for service. The module generally worked ok, but i had to resolder many dry joints, witch would possibly create problems in the future. The warped coil is a sign of rather heavy use in the past, i presume.