Sac187 transistor amplifier

I'm putting together components for an intercom circuit I am hoping to build. I can't find the BEL transistor needed for the circuit. What is the possible replacement for this. We manufacture high voltage solid-state switches for voltages up to kV in single switch or bridge configuration for AC and DC.

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• Peavey Parts
• BACKSTAGE 30 GUIA DE REFERENCIA PARA EL REEMPLAZO TRANSISTORES PEAVEY VIDEOSISTEMAS
• Peavey Componentes
• Peavey CS900 overtemp LED on
• Peavey semiconductor cross reference list
• Bel 187 Transistor Replacement Manual
• D880 Transistor Substitution Manual Download
• Peavey csx800 amp transistor!
• Manual Del Amplificador Peavey Cs 800 Schematic
• 2N6347 . Datasheet. Equivalente. Reemplazo. Hoja de especificaciones. Principales características

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Peavey Parts

Login or Sign Up. Logging in Remember me. Log in. Forgot password or user name? Music Electronics Forum. Peavey CS burning R20 after power up 5. Posts Latest Activity Photos. Page of 2. Filtered by:. Previous 1 2 template Next. Have a Peavey CS, old style, but I don't believe, real old. This is a 5 watt resistor, mounted on the output board, underneath, the PC board, that houses all of the main outputs. Only problem found, so far, was that this resistor was burned open.

Have replaced it, and checked all outputs, and all check good, out of circuit. All 12 of them. Have not swapped the preamp board with the other side yet, as the problem could well be on that, but am wondering if any of you, have crossed this bridge already, and can tell me any info, that will get me headed in the right direction.

Am wondering if the triac, and the other component, on the way to the output jacks, could be playing a part in this. Any knowledge would be appreciated. I have repowered it up, after replacement of the big 5 watt resistor, and it continues to heat up, and will go ahead, and burn, if I allow it to stay on. It's a symptom, but not the problem. One left, and one right. Thank you. Tags: None. Jazz P Bass. The two 5 watt resistors are part of the output 'zobel' network.

That would explain the resistor getting hot. You should be able to disconnect the triac board. If not that, I would check the capacitor part of the zobel. Attached Files CS Comment Post Cancel. Revised in ??? I was not aware they updated anything 25 years after the amp was made. Can you post the drawing you are using?

We really need to use part numbers, rather than the resistor under the main board. First thing to do is find the resistor on the schematic. Now what current paths through it can burn it up? Does it connect to a transistor? When the amp channel blows, it often kills the output triac, that is the triacs job. In 30 years doing authorized service, I never saw one of the little things next to the triac fail.

Pick one channel to work on at a time. If this is the model I am thinking of, the top cover comes off exposing two finned modules side by side, yes? A very few screws, and the m,odule lifts off, and ther is enough wire slack you can lift a module up and prop it agaisnt the outside.

I like to fold a newspaper in between module and chassis to prevent possible shorts. On the underside of each is a four pin Molex connector. Disconnect that and the module is removed from the circuit.

All the plugs on the driver card can stay. Now work on the other one Yes you can trade driver cards for test purposes, but only after you know nothing is blown on the main boards.

Education is what you're left with after you have forgotten what you have learned. The Dude. You can check the resistance across the banana output terminals and it will usually tell you if there is a triac problem. Easier than pulling the board. Thank you, all. Enzo, I am using the schematic, that Jazz P Bass.

I was wondering about the triac, but didn't know for sure how to test the thing. From what each of you have instructed, I'll do the procedures, and see what I find. R20, is my culprit that is doing the burning. I'll be checking the triac, and replacing the C8. It's cheap, and if the resistor has been stressed to the point of burning the first one, it's not going to hurt. This is the model, just as you described Enzo. I have two in my system, downstairs, that I've ran for years.

I'll get this thing tested, again, from what you've told me, and give you a progress report. Thank you, all, guys. It is very much appreciated. The Triac can be tested by looking for a short across the output connector.

I would think that a shorted Triac would burn R19, not R If C8 is bad, now that would heat up R Or a high frequency oscillation. Tried Digikey and they needed more info, than just the SAC Didn't have it. Thanks guys. This is a suitable substitute. It's been a long time since I had to deal with a shorted "crowbar" triac in a Peavey. If memory serves me, there's an associated 'diac', looks like a diode, that should also be replaced at the same time as it usually perishes along with the triac.

I have repaired many blown CS and other series amps from Peavey, and I have never once had to replace the diac. Worth checking, of course. The triac is just a triac, you should be able to find a data sheet on it, even if the part is gone.

It is a v 12A TO triac. The thing you need to look for other than those is that it fires on all four quadrants. PV shows 2NA as the generic. I forget what I stock, some common Moto types. Thank you, Dude. It's looking like I have an old one.

This has the silver power supply cans, even says "made in USA," on the big caps. No big triac, riveted to the chassis, like I've seen in the past. After looking at Google images, and seen the little board, that the triac you are describing, as the schematic shows; they are not even in this one. This is the same amp, I was inquiring about in the past, as I've been recovering from back surgery, and got the ok, to start lifting this thing, again.

This does have the white, two speed fan button cover on the front. Am sure it's the ones, they speak of prior to No docs, on that one. I am going to replace the R20, 5 watt 5. Thank you, all, for the knowledge, and I'm going to try, and nail down the older schematic. Any further ideas, I'd definitely appreciate any, and all.

Last edited by RogerT ; , AM. Reason: spelling. I don't recall ever seeing a CS without the triacs, but it wouldn't be the first time I'm wrong.

If it's a '77 model, like you said in post 1, the triacs will be mounted on the little circuit boards that the banana jacks for the speaker outs mount to. That's why, as suggested, you can check across the speaker terminals to see if they are shorted. It saves you having to remove that board, which is a bit of a PITA.

BACKSTAGE 30 GUIA DE REFERENCIA PARA EL REEMPLAZO TRANSISTORES PEAVEY VIDEOSISTEMAS

SAC pinout. Could someone please give me a pinout of a SAC triac? I received this from Peavey as a replacement part for an M Mark V amp that would not shut off. The bad triac looked like a full wave rectifier with only 3 pins. The replacement is a TO case. I have requested info from Peavey, so far nothing. I have scoured the internet looking for a datasheet or pinout.

Peavey Componentes

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Peavey CS900 overtemp LED on

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Peavey semiconductor cross reference list

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Bel 187 Transistor Replacement Manual

Our semi-conductors are selected for "safe operating area" and beta range. Commercially available equivalents may not parallel these specs. Devices may be mixed or totally changed over to SJ Motorola part No longer available. Replace with O. SJ No longer available. SJ SJ No longer available. No longer available.

D880 Transistor Substitution Manual Download

Cross Reference Search. The transistor's ability to change between these two states enables it to have two basic functions: 'switching' digital electronics or 'amplification' analogue electronics. Then bipolar transistors have th. Some of the transistors are types with integrated resistors; in the list, a base resistor means a resistor connected in series with the base.

Peavey csx800 amp transistor!

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Our semi-conductors are selected for "safe operating area" and beta range. Commercially available equivalents may not parallel these specs. When replacing power output devices, our designs do NOT require Banks or that all be replaced. No longer available. Replace with RCA, order by

Manual Del Amplificador Peavey Cs 800 Schematic

Quality made reliable transistors from Parts Express Brand. Finding a substitute replacement transistor isn't difficult if you know the specs of the original transistor and organize your stock by specs instead of type numbers. You'll find that fewer devices need to be stocked, and turnaround time can be reduced. NTE Electronics Inc. Electronic Components Supplier The remaining 0.

2N6347 . Datasheet. Equivalente. Reemplazo. Hoja de especificaciones. Principales características

Driver: SJ Replace fuse and rig the power cable of the amp in series with a watt light bulb for testing. Upon power up the bulb will glow brightly and the fuse will not blow. Unplug each power cable on the output boards and attempt to see which side of the amp is causing the short.