Peavey Decade schematic

[pdf64]

I've got a friend's Peavey Decade practice amp in (SS / IC), which has no output. Does anyone know where I can get a schematic? Thanks - Peter.

[Gtr_tech]

Email Peavey.....they'll send it to you.

[pdf64]

Good call, I didn't hold out too much hope, but repairs@peavey.com came good within a few hours. Peter.

[Gtr_tech]

They're surprisingly easy to deal with. I'll post here or on alt.guitar.amps and ask for schemos if its a weekend and I have a rush job I need to get out the door. Sometimes I get lucky and someone has it on file.

[Enzo]

I am a PV service center and have access to their dealer site, where almost all the schematics are filed. If I don't have it already, I can download it any time, so feel free to ask.

[Gtr_tech]

Right on....I'll keep that in mind.

[Livio]

Schematic for Peavey Decade amp

I am a PV service center and have access to their dealer site, where almost all the schematics are filed. If I don't have it already, I can download it any time, so feel free to ask.

Please, Enzo I need the Peavey Decade amp schematic. Can you help me download or tech me how to get it from Peavey. Thanks Livio@economyplumbing.com

[Amp Kat]

I've got a friend's Peavey Decade practice amp in (SS / IC), which has no output. Does anyone know where I can get a schematic? Thanks - Peter.

Just go buy a TDA 30- IC chip and replace it and you are done.

[Enzo]

I don't have it nearby right now, but customerservice@peavey.com will send it to you.

[runicen]

Just go buy a TDA 30- IC chip and replace it and you are done.

I have a dead Peavey Decade as well. What part is this and how would I go about ordering a replacement?

Sorry if this is a stupid question. I'll dissect guitars endlessly, but when it comes to amps, I'm normally more inclined to replace them when they go out. This one just has sentimental value.

[Amp Kat]

Usually when this amp goes out it will just hum when you turn it on. Pull the amp from the chassis and look in the middle back part you will see a 5 pin spider chip with a screw through the middle on a heat sink. Make sure it says TDA 2030 or TDA 2030A and some have TDA-2040.

Call MCM at 1-800-543-4330 and tell them you need which ever one it is. TDA-2030= $2.34 TDA-2040= $ 4.68

Not very hard to change and a very simple amp to work on.

[Enzo]

And the parts department at Peavey will also be happy to sell you any part for their products.

[runicen]

Usually when this amp goes out it will just hum when you turn it on. Pull the amp from the chassis and look in the middle back part you will see a 5 pin spider chip with a screw through the middle on a heat sink. Make sure it says TDA 2030 or TDA 2030A and some have TDA-2040.

Call MCM at 1-800-543-4330 and tell them you need which ever one it is. TDA-2030= $2.34 TDA-2040= $ 4.68

Not very hard to change and a very simple amp to work on.

Would I be better served going through MCM or Peavey directly?

Also, am I going to have any trouble swapping that part out with a basic, Radio Shack soldering iron? I've read that board components can be a bit tricky to swap out.

Last question, and probably the one bound to give you headaches: This TDA chip - what is its role in the circuit and how does it fail over time? Just to be sure we're on the right track, it just hums now, but for a while, it was giving me signal for 5, 10, 15 minutes before fading out like the power dropped out. Can it fail progressively or is it either going to work or not work?

For the record, thanks a ton for the help!

EDIT: I broke out the board and the part that most closely matches the description given doesn't have a TDA marking on it. It has two numbers: "CA2004M" (could be "OA2004M") and "RCA 115."

[Enzo]

Oh shop around. TDA2030/2040/2050 series amplifier ICs are common generic parts, and most parts houses sell them. MCM, Mouser, Digikey, Peavey, etc.

Mouser is a large parts house, I use them a lot. They have no minimum order, however the minimum shipping charge I think is $8, so if you buy one $3 part it has the shipping added on. I am not sure what they charge for one at Peavey, but I THINK they include shipping in the cost. So $5 or $6 may seem like a higher price, but if it includes shipping it is a bargain.

MCM is a fine parts house, but if I recall they also have a $25 minimum order. SOme companies with minimums will ship smaller orders but tack on a $5-10 small order fee. You'd need to check. If i am already ordering $25 of other stuff from MCM, then the minimum is met and I can add a TDA2030 without penalty. But to order one small part, it is not the best choice.

[Enzo]

Having said that...

Welcome to the forum. But let me suggest you open with your amp's problem. The original thread is about a no sound amp, you say yours is dead, but it isn't dead, it makes noise. Dead means it does nothing.

The Decade came in two versions. The older 1980 one had a TDA2004 power IC, the later version had the now more common TDA2030 IC. Without getting into it, the CA2004 is just another name for TDA22004.

Parts can fail in many ways, there is no one way something fails.

You MIGHT have nothing more than cracked solder on your main filter capacitor. You MIGHT simply need a new main filter capacitor. Your power amp runs on a single supply, so it needs a DC voltage blocking output capacitor, yours might be failing. At 30 years old, electrolytic caps are often dried out and needing replacement.

The TDA2030 or in your case TDA2004 is a power amplifier IC (integrated circuit). It has pins for power supply , input, and output. SImple. They donl;t fail "over time," they can last forever, or they can fail. They don;t usually "wear out."