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Heard a few say that the stock mic causes the talk back over external speaker. I might try a different mic

Don't be surprised by removing R174 and 44 that it lets the radio slide so far it gets drifty on slight temp changes

Those radios do not have the amp built in like the e5k and turbo

I have a matched pair of 2879 HG's that have an HFE of 68. factory states the HG's will produce aprox 95% of toshiba ratings

I hope everyone's holidays are safe and enjoyable. May the new year be better than the last ~cheers~

Here is a redraw has been around the net a while I added the TR descriptions and marked the stages. If you catch a mistake let me know

The radio is not peaked and the match is good no other audio mods done to it has less than 10 hours on it What type and size of chokes are you talking about. Thanks

So what is the problem and fix with with talk back turned off and still coming over external speaker on a 955HP?

Any one happen to have a SM for a eagle 5000? I think it is the same as a galaxy saturn turbo and rebranded for copper electronics but not positive. Thanks.

I sold some really nice 2k's a few with original boxes and never got more than 350 plus shipping

Trace with amp off and on

It was shorted out. it tested as a 33ohm resistor on 2 of the legs on my component tester

I used a nte152 seems to work now but it is not heat sinked yet. I can not find bd179's for under 20 dollars US. Also if you run acrossed The schematic I would like a copy. Thanks It no longer has that tunneling on the scope trace so that is a plus.

TR9 in the newer amp can use a NTE152 the version i have uses a BD179 or NTE182 But they have different current ratings but seems both versions use the same parts as each other all but TR9. maybe remote mount a NTE152 in it's place? Did they find they could use a part with less current handling...

Got a schematic laying around for that old version? I have been running using a schematic for a newer style and it is not working well for me. Any chance on using an nte152 in it's place with lead changes? In all these years you would think i would learn when to toss in the towel be it as it...

I put a new 1 ohm in that's when it smoked

This reminds me of some of the cars i worked on in the 70's and 80's that the same car had 4 different flywheels 3 different sets of crank pulleys ect was no standardizing between them just what ever left over parts they had to use at the time. Total to date of parts replaced: TR10 IC2 IC1 TR7...

On the schematic it shows TR9 as BD241....the transistor i took out says BD179 That ones a 20 dollar part... This has been more of a learning experience than fixing an amp it has nickled and dimed me past the point of its worth lol

The 1 ohm smoked a few seconds after i powered amp up With C34 out of line Tr9's collector shows ground

I am still waiting on parts....