Peavey 1.3k versus PV-2000 - Page 5 - diyAudio
Go Back   Home > Forums > Live Sound > PA Systems

PA Systems A forum for discussion of all parts of a sound reinforcement or DJ system: loudspeakers, mixers (desks) etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 20th March 2014, 04:08 AM   #41
diyAudio Member
 
Join Date: Mar 2014
Default pv1.3k

I have been working on pc1.3k with some parts not matching the schematics on the drive board and output board ??? Is there updates that came out after 1991
  Reply With Quote
Old 21st March 2014, 12:38 PM   #42
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
Uh, yes the driver card has the predriver transistors Q100 changed to MJE15032 and Q104 to MJE15033. R110 and R220 go from 10 to 33 ohm. R102, R127, R202, R227, go from 1.5 kohms to 4.7k. The MJE parts have more gain than the Chinese transistors (SA968b, SC2238b) specified in 1994.
The output board, there are pricing pressures on the output transistors. To save $20 I replaced MJ15024 and MJ15025 with MJ21193 and MJ21194. Someone else may have used something different depending on the price that day and what is available. I find the output transistor cold idle current deficient and may do something about replacing R110 with a potentiometer before I put the top on.
Enzo always recommends buying the transistors from Peavey as they come matched up, but you have to have a phone with long distance service to order from them. My phone with long distance service is a pay phone at the gas station, and shouting out part numbers and my debit card number over the diesel cooler noise is a real nuisance, so I bought from newark.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300

Last edited by indianajo; 21st March 2014 at 12:45 PM.
  Reply With Quote
Old 21st March 2014, 04:46 PM   #43
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
Oh be fair now, Peavey has ALWAYS had toll free telephone numbers. If your phone is on the wall at the gas station and it for some reason will not allow toll free calling, that is not Peavey's fault. So unless you have a long line if guys behind you waiting to use that phone for parts orders, I don;t think it is proper to tell people not to ordeer thiungs from Peavey because of that.

And let's be straight. I always suggest Peavey as one source, because they will have real parts - the same parts they use in their products. They will not be counterfeits, and they will not be mis-matched stuff like NTE sells. I don;t worry about matching, Peavey transistors are not sold by grade. But Peavey prices are usually reasonable, maybe not the lowest, but not a rip off. And last I checked the Peavey parts price included shipping, so consider that in your calculations, because the Mousers and Newarks of the world generally charge you $10 and up to ship.

MY first choice is buying my MJ power transistor stock from a reliable supplier like Mouser.

Current pricing on parts does change so indeed it pays to check. But today at Mouser MJ15024 and MJ21193 are both selling for the same $4.72 each in lots of 10. I have absolutely nothing against the MJU21193 as a sub, however it is a different transistor, so I consider it a bad idea to mix it with the existing MJ15024s, so if you plan to use the 21193, in my view you need to be replacing ALL of the parallel outputs with them. They all need to be the same type, regardless of which, so they share current well and thermally track each other.
  Reply With Quote
Old 21st March 2014, 05:14 PM   #44
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
I bought 22 MJ21193/4 at onesies prices because 19 out of 20 OT's were blown. Two were .01V off Vce when energized with a 100 ohm base resistor and 10 ohm collector resistor, so those became the MJ15020/1 driver.
Newark has sales on old stock sometimes, even parts that don't age like transistors. I usually need something else besides transistors; this Radio Shack bargain pack collection from 1974 is missing a lot of values and wattages. Newark's metal film resistor prices from Thailand and India (Vishay, multicomp) are way better than Mouser's Xicor prices from C****.
And from Newark South Carolina to Louisville, a newark package UPS is usually $7 surface since my house counts as a "business". Many times if the order goes in by 1000, the package is there by 1630 tomorrow, surface rate. Distance really counts on UPS charges, and there is a residence surcharge, so your location and status matter a lot on shipping cost. Interesting about the free Peavey shipping, maybe I'll buy a fan likely to be better than the 16 year old one in my box.
If you're watching Enzo, do you have to measure all 5 emitter resistors per side to calculate idle bias current? I've measured the two emitter resistor I can reach of the five per push or pull, and I'm getting 2 to 4 mv with input tuned down to zero. I don't suppose this matters much if one is whomping out table shaking bass in a bar, but my real application involves 1 Vpp music in the living room, so no crossover distortion at low power would be nice. I bought some 120 ohm cold NTC resistors (GE CL-90) to put on the heat sink instead of 33 ohm R110, thinking of putting a pot across R110, but that is getting out in the way beyond my design expertise zone.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300

Last edited by indianajo; 21st March 2014 at 05:26 PM.
  Reply With Quote
Old 21st March 2014, 07:34 PM   #45
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
Obviously one has to consider all the logistical questions while shopping. I always make up a grid sheet: part I need down the left, supplier names across the top. Then I fill in the prices for each thing at each supplier. I then figure out the best OVERALL order to place.

I don't usually worry about idle current, I am more inclined to watch crossover distortion and heat.
  Reply With Quote
Old 11th May 2014, 05:36 PM   #46
diyAudio Member
 
Join Date: Mar 2014
Ok guy finally got all parts in the pre drive boards and replace all bad output,no dc showing at out put,got one channel working but not the other the ??? That I have is there to be all three chip set in both boards u100 u101and u103
  Reply With Quote
Old 13th May 2014, 11:46 AM   #47
diyAudio Member
 
Join Date: Mar 2014
For this pc1.3 k up and running but driver board voltage is a little strange .I have rail voltage showing up on one board at the to3 case one board but on the other board it is showering 1.5 volts .is there a blocking cap that I am over looking .?
  Reply With Quote
Old 13th May 2014, 12:09 PM   #48
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
Quote:
Originally Posted by randyrcaudio View Post
That I have is there to be all three chip set in both boards u100 u101and u103
That sentence with its use of both past and future tense is not English as I understand it.
I had to replace U100 and U101 and U102 on one board but only 101 and 102 on the other. One board the power supply bypass cap to U100 was blown. 50 v rated caps are subject to 180 v when one of the output transistors has failed shorted C to B, along with the driver and predriver transistors.
I don't see a U103. U102, half provides a signal to the variable gain IC U101, the other half drives the DDT LED.
One DC tests op amps by shorting the input at the 1/4 phone connector, and seeing if the output of the op amp fits the equation Vo= A((V+)-(V-)). A is Ri/Rf. U101 is a variable gain amp, not an op amp.
Then if you still have problems, put music in through a radio or something and check that the AC flows and uniformly gets bigger through the various stages. If you use rock music the beats of the music on the meter pointer distinguish signal from possible oscillations. DVM are useless for the AC test, they average over 2 to 4 seconds, make 8's when the signal moves dynamically, and most I have bought produce random numbers on the AC scale for music frequencies. I use a Simpson 260-6XLPM VOM with 20 VAc and 2 vac scales. Scopes can be nice when they actually work, which is seldom in my experience. I have not bought any new Teks; when your employer can afford one a 465 or 466 works nicely.
U100 had a bad solder joint between the socket and board, and kept whanging the output to +180 v and lock when I touched that pin with a meter probe.
To answer the second question which appeared as I was answering the first, rail voltage should appear on the case of both Q105 and Q106. It comes in through pins 3 and 6 of the 10 pin connector, which is not built of the world's most reliable technology, having push in back connection. One person was bedeviled by an ittermittant ground pin on one of those connectors in a PV800. The pins and blocks are still for sale from TE connectivity I believe, I bought some gold ones for the VI limiter circuit.
Another possible reason for assymetric voltage on Q105 Q106 is that the flying rails have flown off to 180, 1.5, due to the output transistors being stuck on on one side. At idle rails should be +85 -85.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300

Last edited by indianajo; 13th May 2014 at 12:28 PM.
  Reply With Quote
Old 13th May 2014, 12:43 PM   #49
diyAudio Member
 
Join Date: Mar 2014
Thank you for the reply and this a break down of what I have done,replace every semi on the bad driver board and on the out put board,check and double check every solder joint,left out triac tell everything is correct.The driver board that I am having a problem with is the good board.going to trace out signal path out later today with scope to verify
  Reply With Quote
Old 13th May 2014, 12:48 PM   #50
diyAudio Member
 
Join Date: Mar 2014
I should add that the audio is clean at the outputs,just don't understand why I have 90 volts showing up at the drive transistor case on the good board
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need Peavey 1.3K Schematics Zero Cool Solid State 26 23rd January 2011 03:25 PM
Peavey 1.3k 406vette Solid State 7 30th August 2008 01:45 PM
Peavey 1.3K amp smoked... board testing soccerman58 Solid State 2 30th August 2008 12:11 AM
Service manual of peavey PV-8.5C xiaof_99 Solid State 2 31st December 2007 12:18 PM


New To Site? Need Help?

All times are GMT. The time now is 07:30 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2