Thank you for the replies you guys.. So taking a closer look at things slowly finding similar things as I go... This is very interesting... Different part numbers for some things and same part number for others... I hope I can repair this Amplifier,, it is very interesting,, I really like that it is not a Pentawatt output design. Also very cool is the(never seen before Equalizer chip.. BA3812A in this case, On page 4 of the schematic it is a KA2235, which mixed me up a little for sure... output trans are 2233's,, Humblest apologies for the confusing statement,, Just me thinking out loud,, I do that sometimes... I will look into the other suggestions as well.. Thanks again you guys,, I really appreciate the help... Oh and of course,, Happy New Year and the Very Best to you.. 

Hi J.P. I was posting what was stamped into the Chip,,, Not seeing anything too familiar in any of those Schematics,, Thanks for posting any way,, It's going to be another fly by the seat of my pants repair,,, Seems to be very hard to get schematics for Chinese made amplifiers,, even of bigger brand names.. This should be fun.
:dbtu:

HI guys.. I'm trying to repair a Trainor Bass Mate 25 solid state Bass amp and I was wondering if anyone know's if there is a Schematic available for this amplifier.. The Model number is YS 1076 and it used 2 C 2233 Y NPN output transistors.

I bought them from a friend of mine who bought them when they were still in production.. I think he said he had 100 of them or so,,, I bought 10,, and good thing,, LOL,,,

I built an epoxy support for the chip and it is mounted to a Heat sink,, it's waaaaay better now,,,

Every thing is installed and now will amplify a guitar signal,, Sounds crappy but I'll have to re bias the tl-072 because i had to put in a voltage divider to drop some of the voltage to the op amp,,, Just keep going round and round,, but getting closer...

Not sure about the 2050's but for sure the 2030 are obsolete. I have bought a LM 1876 chip for later on. Gotta say,, sure am learning alot here. Thank you guys.

Hi Phil,, Yes I do,,, I found the problem when I went to replace the chip,,, It was a Broken Pin 4,, Snapped right off,, I'm going to have to find a way to support the Heat sink,,, It keeps flopping back and forth and broke the pin off,, Dang,, so close to getting this working,, LOL,,,, Are you talking about the Metal tab that is the back of the 2030,,, I always thought that was tied into ground and connected on the inside to pins 3 ?

Very strange indeed. This is my first experience with these chips, so learning an amazing amount about them for sure... I've blown 2 of them up,, which is very frustrating for sure.. Had the last one wired up and everything was correct.. Voltage from the tl-072 was finally working and before I put it in the Chassis it worked,, after that nothing,, Crappy,, LOL,,, No output,, going to try another TDA2030,, Not sure if the issue was static or overheating or just being played with too much,,, Checked the temp with my lazer and it got hot but still under the radar,,, I'll take the dead chip out an install a new one and see what happens,,, Thanks for your Help.. Really super appreciated it for sure..

Ah, I get it,, That's crappy for sure... will place the cap in the positive side of the chip output..... Thanks you guys.

Hi Phil,, How will or does it burn out the voice coil?

Hi J.P.. Hi J.M.. Thank you for your replies,, Yes I have installed C3 (.1uf) and R4 (4.7ohm) .

Here is what I've come up with,,, I uninstalled C8(B?) from the Hi pass filter and reversed The polarity of C1 the input capacitor,,, Guess what?? The Oscillation totally stopped, Yaaaaaaaay,,,,,

I have one more question if I may,,, Do I really need to install the 2000uF capacitor on the output to go into the speaker? Aaaaaaaaaaaaand what happens if it is not installed? I realize that it is there to block the DC from hitting the Voice coil but,,??

Hi here is the schematic,, I hope,,,

Hi I was wondering if anyone can Help with a TDA 2030 audio chip guitar amp oscillation problem that I'm having with my amp build.

I'm using a Single supply and using the Schematic from the Data sheet for single power supply application.

After finally getting the chip to amplify a guitar signal from a tl-072 pre amp, and figuring out where to put the volume control and what size pot to use,, I've managed to get the set up working.. Only problem is,, It oscillates at a particular volume setting.. I'm truly stumped here.. I'm using the components listed on the schematic, but i'm wondering if there is some other component that has not been included? How do I stop this tda 2030 from oscillating? Hope fully some one can help. Thank you...