Chris' Pioneer Spec 4 hack job

[laatsch55]

This was bought for Chris in Ft. Dodge. Looks pretty good till ya flip the hood up on it. IO'm guessing it wouldn't come out of protection, so you take the protection relay out and wire it direct. The STV-3H and STV-4H diodes have beenm replaced with something wrapped up in a # 10 ring terminal. They didn't even bother to bolt the amp module back in. This will be a long term winter project. The more I look the worse it gets.

 

[Gepetto]

Re: A Pioneer Spec 4 HACK JOB

Looks like a thermistor in that ring lug Lee

 

[laatsch55]

Re: A Pioneer Spec 4 HACK JOB

Yep, I'm guessing the wrong one. 150 mv DC offset is not a good first sign. Mr. Burke arrived an hour ago with his daughter and the 400 in tow. He has a couuple sets of Dahlquist DQ-10's and 20's. I can scratch that speaker off my "Want to hear" list. James says they wouldn't even begin to be in the same neighborhood as the Horns. A nice guy Joe. The first big bass note on Crystal Method, track 4 brought the little girl plumb outta her seat.

 

[Gepetto]

Re: A Pioneer Spec 4 HACK JOB

That spec 4 is pretty crunchy inside Lee based on the earlier photos you posted.

 

[laatsch55]

Re: A Pioneer Spec 4 HACK JOB

Yeah, it's a sad specimen. earlier photos were of Spec 2's.

 

[mlucitt]

Re: A Pioneer Spec 4 HACK JOB

Lee created another PLWOA convert...

 

[laatsch55]

Re: A Pioneer Spec 4 HACK JOB

Oh yeah, sure did.

 

[Gepetto]

Re: A Pioneer Spec 4 HACK JOB

The Spec 2 was the dusty one that you shared earlier Lee? Did you get both at the same time?

 

[laatsch55]

Re: A Pioneer Spec 4 HACK JOB

No Joe, got the Spec 2 a couple weeks ago, got the Spec 4 yesterday.

The Spec 2 is just dirty, hasn't been butchered like the 4 has.

 

[orange]

Re: A Pioneer Spec 4 HACK JOB



That is all.

 

[laatsch55]

Beins I've got a relatively cherry Spec 4 in from Rick, thought it would be a good time to fix this one too. Sometimes there is no substitute for a side by side comparison.

 

[laatsch55]

Well, this Spec 4 has been sitting on the bench idling for 4 houirs. can not find a thing wrong with it except the weird unit in place of the STV-3H. It seems to be tracking rather close. Gonna hook it up to the AP, get my other meter out and check tracking from idle to 200 wats/ channel.

 

[laatsch55]

I would like to know what the unknown device is in place of the STV-3H, tracks incredibly close...

 

[laatsch55]

Frequency response, 1 watt, 8 ohm load...

 

[laatsch55]

Joe , what does it mean to have "wave like " undulations as sine waves??

 

[laatsch55]

THD & N left channel

 

[laatsch55]

WOW!!! THD & N Right channel...

 

[laatsch55]

Other measurements...

 

[laatsch55]

I don't think these are on the acceptable output list. And this was the channel that looked like the sine wave was doing the watusi...

 

[laatsch55]

In addition to there being the wrong outputs on the left channel, there was a broken collector wire wrap on one of the NPN OUTPUTS. wATUSI INDEED.