Hi all, I have a nice TR2025 receiver that is fully functional. It is equipped with an old phono / tape 1 / tape 2 DIN input. What I notice is that the amplification on the Tape DIN inputs is less than on the other sources. I have an adapter plug from DIN to RCA, which I connect to my phone. It sounds fine, but quite soft. I think it makes a difference of a quarter of the volume. Is this normal? (I did read somewhere that the signal can be lower with DIN.....)
Is there a possibility that I can adjust the input / output by changing a number of resistors in values? I would like to have the sound on the TAPE 1 DIN a bit more amplified. Maybe someone can help me on my way? Thanks in advance.
Is there a possibility that I can adjust the input / output by changing a number of resistors in values? I would like to have the sound on the TAPE 1 DIN a bit more amplified. Maybe someone can help me on my way? Thanks in advance.
I don't see any attenuators in the tape input path. So whatever you are feeding it is what goes to the volume potentiometer. There seems to be no other 'aux' or 'CD' or whatever input, just the internal radio, phono, and tape 1 and tape 2. Do you switch a lot between radio/phono and the tape inputs? Otherwise I'd just live with the volume adjustment.
Thanks for the response. Then I'll leave it as it is. I don't switch much between the sources. It's just that the sound via tape din is not really sufficient in my living room. On the FM Tuner it sounds a lot more full-fledged.
Well, if the volume coming from the phone can't be cranked up, then you could add a separate preamplifier, or build one into the receiver, either from scratch or by adding a small preamp module. I did just that for my Zenductor 2, because I could not figure out how to increase the Bluetooth output from a Macbook.
There is almost no chance that the output impedance of your phone is not low enough so that it sees too much loading from the receiver volume adjuster (25 kOhm potentiometer). It seems very unlikely to me, because this is a headphone output, right? I'm just mentioning that because for the radio and phono input your receiver has one additional transistor Q601/602 (left/right) in the circuit, an emitter follower, if I'm not mistaken, which does not increase the voltage, but can deliver more current for those two inputs. The tape inputs do not go through that transistor, but they shouldn't need to, and if your phone output is a headphone output, it wouldn't help at all.
I assume the tape/source switches have been cleaned? It would be unlikely though that the 'tape' contacts would be dirty while the 'source' contacts are clean.
There is almost no chance that the output impedance of your phone is not low enough so that it sees too much loading from the receiver volume adjuster (25 kOhm potentiometer). It seems very unlikely to me, because this is a headphone output, right? I'm just mentioning that because for the radio and phono input your receiver has one additional transistor Q601/602 (left/right) in the circuit, an emitter follower, if I'm not mistaken, which does not increase the voltage, but can deliver more current for those two inputs. The tape inputs do not go through that transistor, but they shouldn't need to, and if your phone output is a headphone output, it wouldn't help at all.
I assume the tape/source switches have been cleaned? It would be unlikely though that the 'tape' contacts would be dirty while the 'source' contacts are clean.