Image

Way

This is the place to ask questions about linear amplifiers, or power supplies

Moderator: JR Moderator

User avatar
EZ CHOPPER
Skipshooter
Skipshooter
Posts: 288
Joined: Sunday, 27 November 2016, 8:53 AM
Name: Edward
Cell Phone: 615-967-1568

Way

Post by EZ CHOPPER » Saturday, 25 February 2017, 8:25 AM

I just picked up this Dave Made Amp 6 pill and it had like bacon grease or chicken grease all inside of it you can see the grease in the photos what the hell. Way would you have it right next to where your cooking makes no sense to was suppose to be a good one I should have looked at it better. did some checking around in it after I cleaned it up and 4 of the pills are bad this sucks. where is the best place to by pills for this thing at a good price with out getting junk. They say ebay is the worst place to by them. the guy said it would do 2000 watts don't see that maybe 1500 I don't know don't know much about these amps

Image

Image

Image

Image

Image




User avatar
543FtWorth
Wordwide & Qualified
Wordwide & Qualified
Posts: 1617
Joined: Sunday, 18 July 2010, 17:54 PM
Radio: (non-sponsor) 29 LTD
Antenna: *Censored*

Re: Way

Post by 543FtWorth » Saturday, 25 February 2017, 10:39 AM

If you want it to last after its been repaired run it around 200 watts deadkey 600 to 800 pep. It will do alot more but you'll be buying pills again. To fix it properly isn't cheap.

I won't buy 2879s anywhere but rfparts. For that amp I'd buy a matched set of toshibas. They are pricy so don't just replace them and key it up hoping for the best. All caps and resistors need to be tested and replaced if theres any questions about them. Then the LC network on the input and output needs to be checked also. Then replace the pills.

If you don't want to put that kind of money in it sell it for parts and move on to something else.
Last edited by 543FtWorth on Saturday, 25 February 2017, 10:42 AM, edited 1 time in total.



User avatar
443 Arizona
Wordwide & Qualified
Wordwide & Qualified
Posts: 667
Joined: Thursday, 29 April 2010, 13:22 PM
Radio: madison on 5/8 wave
Location: phoenix, arizona

Re: Way

Post by 443 Arizona » Saturday, 25 February 2017, 10:42 AM

greasy huh? well maybe it was used as a cooktop? :biggrin:,, who knows what happened, but , as for fixing the pills, i would replace all 6 and burn them in easily. there may be other circuit problems to check beforehand.
build something else with the old 2 pills, or sell,
look for new pills in a general search(google :puke_l: )them.



User avatar
543FtWorth
Wordwide & Qualified
Wordwide & Qualified
Posts: 1617
Joined: Sunday, 18 July 2010, 17:54 PM
Radio: (non-sponsor) 29 LTD
Antenna: *Censored*

Re: Way

Post by 543FtWorth » Saturday, 25 February 2017, 10:43 AM

Burn them in???



User avatar
MDYoungblood
Moderator
Moderator
Posts: 7505
Joined: Saturday, 12 June 2010, 19:05 PM
Radio: Uniden Washington
Antenna: Avanti Sigma II
Name: Greg
Location: Baltimore, MD
Contact:

Re: Way

Post by MDYoungblood » Saturday, 25 February 2017, 10:54 AM

I'm guessing it was an online deal you made because if I picked it up locally and it had an odor I'd have walked away at least there were no critters living in it.

3's

Greg


"321, the Middle of Maryland"

23 AM "WORLD WIDE" 38 LSB

Strong Supporter of America's Original Homeland Security Act
The Second Amendment



Official Moderator - CBRT Complaint Department


User avatar
jon6667
Skipshooter
Skipshooter
Posts: 282
Joined: Wednesday, 11 May 2016, 7:17 AM
Radio: icom 7300
Antenna: dipole
Name: jon
Cell Phone: 5183353857

Re: Way

Post by jon6667 » Saturday, 25 February 2017, 12:37 PM

sorry to see you get ripped off.
hope you did not pay a lot for it



User avatar
pabxone
Donor
Donor
Posts: 170
Joined: Friday, 01 May 2015, 23:54 PM
Radio: NDI PC201
Antenna: 1/2 wave vertical
Name: Mark Anderson
Location: Victoria , Australia

Re: Way

Post by pabxone » Saturday, 25 February 2017, 17:45 PM

Definitely RF Parts for your supplier of the transistors , You will need a matched set if you want to do it the right way and it's NOT going to be a cheap repair.
https://www.rfparts.com/2sc2879m8.html" onclick="window.open(this.href);return false;

The amp is a 2 driving 6 , I cant see what the 2 driver transistors are - They could be 2879's ?

Are you 100% certain 4 of the Transistors are faulty ? Are they visually burnt or are they failing test when unsoldered from the PCB ?

That's definitely NOT a 2 KW amp , It's not even a 1 KW amp - I see 800 watt's there at best .



User avatar
EZ CHOPPER
Skipshooter
Skipshooter
Posts: 288
Joined: Sunday, 27 November 2016, 8:53 AM
Name: Edward
Cell Phone: 615-967-1568

Re: Way

Post by EZ CHOPPER » Saturday, 25 February 2017, 18:12 PM

I give 300 and my fire bird 500 tube amp for it, now I cant get a hold of the guy of course

-- Saturday, 25 February 2017, 18:17 PM --

check them on a meter 4 bad the ones 1 was like 48 the read like 62 but if I fix it ill replace all 6



User avatar
pabxone
Donor
Donor
Posts: 170
Joined: Friday, 01 May 2015, 23:54 PM
Radio: NDI PC201
Antenna: 1/2 wave vertical
Name: Mark Anderson
Location: Victoria , Australia

Re: Way

Post by pabxone » Saturday, 25 February 2017, 23:53 PM

What sort of meter are you testing them with ?
A multimeter on the diode test range , A multimeter on the transistor test range , or a curve tracer or something else.

They may not be faulty if that is the HFE gain you are measuring - Chances are high that they might not be a matched set of 6 and the fault may be something else ?



User avatar
Crusher
Donor
Donor
Posts: 945
Joined: Saturday, 29 July 2006, 17:39 PM
Location: The Bluegrass

Re: Way

Post by Crusher » Sunday, 26 February 2017, 2:14 AM

I see the burnt resistor at the base of the resistor. But I don't see the resistors on the output combiner burned at all. Hmmm. Usually those burn up as soon as transistor/ pill goes.



User avatar
EZ CHOPPER
Skipshooter
Skipshooter
Posts: 288
Joined: Sunday, 27 November 2016, 8:53 AM
Name: Edward
Cell Phone: 615-967-1568

Re: Way

Post by EZ CHOPPER » Sunday, 26 February 2017, 8:50 AM

we checked it with this kind of meter

Image



User avatar
Crusher
Donor
Donor
Posts: 945
Joined: Saturday, 29 July 2006, 17:39 PM
Location: The Bluegrass

Re: Way

Post by Crusher » Sunday, 26 February 2017, 10:46 AM

That amp looks rough. Been repilled/ rebuilt a few times.



User avatar
jon6667
Skipshooter
Skipshooter
Posts: 282
Joined: Wednesday, 11 May 2016, 7:17 AM
Radio: icom 7300
Antenna: dipole
Name: jon
Cell Phone: 5183353857

Re: Way

Post by jon6667 » Sunday, 26 February 2017, 12:29 PM

sorry you paid so much for a bacon amp. looks
rough from what i see in the pictures.




Post Reply Previous topicNext topic