Show me your guts!

[Dr. Fosgate]

Looks like a PPI AM something or other. The one with the internally bridged outputs, so you have to run both channels separate. Maybe an AM2400 or something?

 

[Dr. Fosgate]

Here is my favorite PPI amp…

 

[maxw]

Re: anybody

geuss this one.

Its a beauty. Is it a PPI?

 

[Easyamp]

I'm not sure? It was handed to me to repair and the owner is unsure. The amp has no stickers or numbers on it.

 

[TO-3]

Here is my favorite PPI amp…

...........................................

Those are nice little amps. With the help of a 15VDC power supply, you can get that guy up to 75W x 4. I wish I could find some nice pictures of the PPI 2500F1.


2500F1 Audio Side


2500F1 Power Supply Side

 

[TO-3]

I'm not sure? It was handed to me to repair and the owner is unsure. The amp has no stickers or numbers on it.

That's an old school PPI Amp. I think it is a 2150M. I know I fixed a bunch of those things when I worked there. What is wrong with it?

 

[Dr. Fosgate]

I think what is wrong with it, is it has hard wired cables on it!

 

[sr20dem0n]

Arc Audio 2100cxl:
http://www.resnet.trinity.edu/areynol1/audio/2100cxl_01.jpg
http://www.resnet.trinity.edu/areynol1/audio/2100cxl_04.jpg

Linear Power 2.2hv:
http://www.resnet.trinity.edu/areynol1/audio/lp_01.jpg
http://www.resnet.trinity.edu/areynol1/audio/lp_03.jpg

....sitting next to an Avionixx 400.2:
http://www.resnet.trinity.edu/areynol1/audio/lp_04.jpg
http://www.resnet.trinity.edu/areynol1/audio/lp_05.jpg

Avionixx 800.2:
http://www.resnet.trinity.edu/areynol1/audio/amp_02.jpg
http://www.resnet.trinity.edu/areynol1/audio/avi_800.jpg


I've also got a US Acoustics 4085 sitting here, but it's not worthy of posting.....god I hate that amp

 

[Dr. Photon]

does that ARC-AUDIO 2100CXL have any components mounted enderneath the circuit board (on the back side)? The design is very clean, almost barren. I can see all the required parts except for the emitter resistors (I'm assuming bipolar outputs, since there's some TP-220 devices, presumeably as drivers). I only see one resistor per channel. are the emitter resistors surface mount on the back of the board?

 

[sr20dem0n]

That's as far as I got in the "disassembly", so I'm not sure if there is more on the backside of the pcb. If it was sitting right here I would take it apart further and see, but it's installed in the car running my tweeters, so it's a bit of a hassle.

I do have a much larger version of the same picture if you'd like, not sure if that would help you at all though

 

[Dr. Photon]

I just find the lack of any large through-hole emitter resistors odd. Everything else looks like it's on the front of the circuit board though (and most car amps I've seen had everything on the front, save a few with predominantly through hole parts and single sided boards that had a few SMT resistors and caps on the bottom of the board).

 

[oPossum]

Re: anybody

geuss this one.

That is a PPI 2300AM. I have one on the bench right now if you need any voltages or waveforms. You can find my hand drawn schematics of it here

Be aware that the power supply in the AM series is *not* PWM!

 

[Matt@Nearfield]

does that ARC-AUDIO 2100CXL have any components mounted enderneath the circuit board (on the back side)? The design is very clean, almost barren. I can see all the required parts except for the emitter resistors (I'm assuming bipolar outputs, since there's some TP-220 devices, presumeably as drivers). I only see one resistor per channel. are the emitter resistors surface mount on the back of the board?

I'll have a check tomorrow (we're the UK distributors), but yes,they are bipolar .. some of Robert Zeff's finest - and boy do they have some grip

 

[Tomg]

ello Matt! Didn't know you ventured round these parts!

 

[Matt@Nearfield]

Wotcha Tom, I read more than write

 

[winslow]

I'll have a few pictures of some amp guts to go up soon.

 

[ocool_15]

ESX Q120.4

An externally hosted image should be here but it was not working when we last tested it.

US Acousics 800F (Zed made)

An externally hosted image should be here but it was not working when we last tested it.

what does the second transformer do? I've seen 2 different transformers in several amps. I am guessing one for the preamp ect and one for the power amp or is the second one part of some filtering?

 

[MOER]

New zed amplifiers

Visit us at www.zedaudio.com to see our new mobile amplifiers

 

[Dr. Photon]

the second transformer has two coils wound on it to regulate the supply rails. the ends of each coil are between the outputs of the rectifiers and the filter caps. This is a called a choke input or choke regulated supply ("swinging choke" if you're using heavey ones with tube amps!). the two coils are wound on the same core so that transformer action can balance the supplys and make them "equal but opposite. The same technique is used in PC power supplies.

 

[Safe_Cracker]

Pheonix Gold X1200.1

An externally hosted image should be here but it was not working when we last tested it.