14-12-2016, 05:09 PM
I am very inexperienced with transistor sets. I have repaired a few "easy cases" but most of what I learned so far is valve-related. Miguel, as we know, is a specialist in Soviet radio tech repair so he will know all the irregularities of the design. Of course, I would love to learn. The easiest transistor radios for me (given my lack of experience working on transistorised equipment) , would be the box/case types. For example, I have a Bush that's made in a very similar way to the valve equivalent but with very large transistors point soldered and no PCB at all. So, really, you can hardly go wrong in such a case.
Therefore, I guess I'm saying a Soviet made transistorised set isn't easy. I think in this case I need to delve deep into why the battery box isn't in circuit.All the capacitors and circuitry appear to be in pretty good condition. There is a button at the side of the case (by the volume knob) that is broken.
I am also working in an East German radio I'd shelved for some time as it's more difficult than your average valve radio). I had been baffled by low voltage of sixty odd volts on an anode. All the others anodes were reading as high as expected. Online I found others who had equally been puzzled by this low reading and, in once case, someone had been advised to change the anode coupling capacitors. Fortunately I discovered the workshop test voltages indicated low volts for the valve in question so I am happy with that. I have now located the actual problem so work will continue.
As to the Astrad I can pretty easily lay my hands on the schematics as here:
Therefore, I guess I'm saying a Soviet made transistorised set isn't easy. I think in this case I need to delve deep into why the battery box isn't in circuit.All the capacitors and circuitry appear to be in pretty good condition. There is a button at the side of the case (by the volume knob) that is broken.
I am also working in an East German radio I'd shelved for some time as it's more difficult than your average valve radio). I had been baffled by low voltage of sixty odd volts on an anode. All the others anodes were reading as high as expected. Online I found others who had equally been puzzled by this low reading and, in once case, someone had been advised to change the anode coupling capacitors. Fortunately I discovered the workshop test voltages indicated low volts for the valve in question so I am happy with that. I have now located the actual problem so work will continue.
As to the Astrad I can pretty easily lay my hands on the schematics as here:
