Need schematic or manual for Ross System MEGATECH 250

[Hell]

Hello,
Looking for a schematic or manual for a Ross Systems MEGATECH 250 stereo power amp.

THX

[Hell]

[The Dude]

Good luck with your quest. I know that I've searched high and low for Ross schematics in the past and had no luck whatsoever.

[Steve L]

Not the one you are looking for, but maybe it will help.
Ross Mega-Amp II 400 Schematic.pdf
Steve

[glebert]

I read somewhere that the Ross power amps may have been made by Crest, but I haven't seen a Crest model that looked like the MEGATECH.

[The Dude]

I found the same and contacted Crest last time I had a Ross power amp in the shop. They had nothing for me.

[J M Fahey]

Not easy.
In the OLD days, Ross was the "third" brand from Bud Ross, the first two being Kustom and Kasino, Ross amps being Asian made (Taiwan? Korea?).

I strongly suspect these are completely unrelated, simply some investor bought the Brand and sticks that label on generic OEM Asian amps.

I have repaired "Ross" amps where actual manufacturer was what we know as Samick (Korea) which is a LARGE OEM maker.

I seem to see 4 large Sanken power transistors in yours.

Suggest you post a couple pictures showing a general gut view, a bad channel closeup, show power and driver transistors, and maybe somebody recognizes it, or at least we can suggest some transistor replacements.

Very experienced Techs often can repair "without schematic" but that is hard to do by "remote control" through a Forum thread.

In any case , post those pictures.

Build a lamp bulb limiter so you donīt increase damage while testing.

What is the actual problem?

[The Dude]

The nice thing about repairing stereo power amps is that there are 2 channels. In many cases, you can use measurements from the working channel to diagnose the non working one. It makes repairing without a schematic and identifying burnt parts much easier.

[glebert]

The nice thing about repairing stereo power amps is that there are 2 channels. In many cases, you can use measurements from the working channel to diagnose the non working one. It makes repairing without a schematic and identifying burnt parts much easier.

As long as the power supply is working, but hopefully that could be done without a schematic (with some help, perhaps). From the gutshots I found of the MEGATECH 250 it looks like it was an actual transformer instead of SMPS for the PS, which is nice for diagnostics.

[Hell]

Hi,
Thanks for all the answers.
I will now measure all of the components individually. And if I still can't find anything, I'll throw Ross Systems in the garbage can and then open a beer