Phoenix Gold Phorum

What are the wires in these pics for? I know the one in the first pic all the way to the left is the safety relay, but im not sure about the others. Im recapping my amps and im on my third amp. This is the first one I've seen like that.

What model of amp is it?

str3atwarrior wrote:What model of amp is it?

Its a ZPA0.5

The two wires attached t the switch is part of the remote turn on. The contacts need to touch completing the circuit turning the amp on. It goes under one corner of the plexiglass so when you put a screw in to hold the plexi cover on, it pushes the contact down. It's kind of a safety feature so no strands or the like will get into the amp while it's on.

The other wire I ?? My guess would be some sort of trace they couldn't manage to implement in the board layout so they made a jumper to bridge the connections ??

I know about the remote turn on, its the others im trying to figure out.

I thought they had a switch, or could add a switch on the 0.s to allow for balanced inputs?

Neither of those are near the balanced input.

PG always made a lot of little circuit tweaks in their older amplifiers. I've seen hundreds of different MS "patches" like this. Clearly the ZPA is no different. I wouldn't worry about it!

It runs fine, I was just curious what it was actually doing.

This is a different .5 with another mod done to it. Just adding to the collection.

it looks like they had a bad trace and just had to jump it

Will that affect the quality of the amp?

I repaired one amp once that had a broken trace, but it was more like a burned out trace. A friend of mine hooked his amp in reverse polarity, smoke came out, it was a Xtreme Sound 700 watts peak amp, pretty shitty amp but was decent enough to run 1 12in in bridged mode. Anyway i had to make a jumper to fix the burned out trace, used a 12ga cable to fix it, and it was working the same as before the incident happened.

Definitly not recommended, but it didn't affected sound quality. And i think he still uses it in his car without problems...

On pic 2 Its just was missing ground trace on original PCB. Was fixed on revision B or C. Trace is parts of overload protection circuit. Overload protection circuit will not work on one of the two channels without jumper.

Pic 1 This part of RDDP. We put 2.2 Ohm fuseable resistor in 12V circuit to protect amplifier remote control circuit.

valeks1 wrote:Pic 1 This part of RDDP. We put 2.2 Ohm fuseable resistor in 12V circuit to protect amplifier remote control circuit.

Thanks, do you know about the other wire (black) running from mid board to just past the caps?

zero points had RDDP?

Yep

yea even my v.1 0.3 and 0.5 has RDDP i just didnt know they had board revisions like the ms series amps.

http://download.phoenixphorum.com/Manua ... a2chan.pdf

Yes, they have RDDP

Speaking of RDDP I have a handful of BNIB (well BNIpackage) cables if people are in need of them /end hijack