The amplifier section of my Grundig Radio Receiver Model Satellit 3400 is not working. Checking it I found two Transistors bad and replaced it with BD433 and BD434, However it still needs something etse and I cannot take out the amplifier section. It looks like a screw or clip holds it back in the middle of the right side. I am certain that in the original service manual shows how to take the amplifier section out.. Could you tell me how to release it without breaking the plastic casing? I am in Venezuela about 5000 miles and two borders away from any repair station therefore I have to fix the radio here.. Thank you for your kind help. Thomas Koppel
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It looks like you have a real scientific project. It sounds fascinating and it seems to go well beyond the mere enjoyment of a simple Short Wave Radio. My suggestion: Put your hypotheses/questions to the test and you will form an informed opinion.
Assuming its broken outside the unit: most aerials are very similar to fit, serving the exact same function and not worth the cost of locating the exact same one used for your model due to time, and purchase costs.
Find an old transitor radio with similar sized aerial, ie length and diameter to fit your radio. Measure it and the replacement from an old radio you or a friend does not need.
Purchase a small screwdriver to remove and refit aerial to your grundig. Small sets of screwdrivers can be bought cheaply from discount stores, ebay etc.
Ist Local Oscillator (PLL) stops working. It's desiged with bare minimum feedback to keep it's output reasonably clean. Removing (De-soldering) the screening box reduces losses, but it's still marginal. Something in the osc. circuit is temperature sensitive, so squirting it with freezer spray - or putting the set in the 'frig will get it going again. Have one like this, "Repaired" - been going for about 5 years and just quit again! If I get any better luck next time, I'll re-post this!
If you sent it in 3 times, then I would suggest getting a new one if you know for sure that other's work in that area. If other's don't work, then then you have some type of interception between the radio waves and your radio. There is nothing I can do about that, and probably nothing you can do.