Marantz 2235B Problem - AUX signal through Phono and Tape

[AngelAT]

Hello everybody,

I am encountering a problem I never had in the past.
Namely, I can hear the AUX input signal clearly but when I switch to Phono and Tape I can hear the same signal. The signal is lower in these and is not affected by controls - volume, balance, etc.
I have cleaned the pots and switches, recapped the pre amp and the phono board. The previous owner has recapped the power supply and the main amp.
I am not sure if the problem was present prior to me recapping the phono board.

Has anyone solved this problem? Or maybe you have ideas what might be causing this...

Thanks in advance!

 

[Steven Tate]

Someone had the same problem a few days ago that turned out to be too much input signal from a phone connected to Aux input. What device are you inputting to aux?

 

[AngelAT]

Someone had the same problem a few days ago that turned out to be too much input signal from a phone connected to Aux input. What device are you inputting to aux?

Steve, thanks for responding!

Ha!
This is very interesting!...
I was also using my phone. I will switch to my cd player and come back with info.

 

[AngelAT]

This worked!
I hooked up my CD-73 and all is great!
Still, this whole thing is strange... I had the same problem when I was hooking my iMac...
Obviously both mobile and comp deliver very strong signal.
Is there a reasonable explanation why this is happening? I never had such a problem with my other amps/receivers.

Thanks anyway!

 

[Steven Tate]

Probably if the input signal is too high, it leaks through contacts in the input select switch or something like the Tape Monitor switch. When these things were made, there were no cell phones or PC’s. Everything that was made, in the way of sources, was made to have an output that matched typical amp designs. But with phones and computers, we can way overload that. Someone else may have a better explanation, but that’s the way I see it. You should be able to use your phone or PC. Just lower their volume to something fairly low.

 

[AngelAT]

Probably if the input signal is too high, it leaks through contacts in the input select switch or something like the Tape Monitor switch. When these things were made, there were no cell phones or PC’s. Everything that was made, in the way of sources, was made to have an output that matched typical amp designs. But with phones and computers, we can way overload that. Someone else may have a better explanation, but that’s the way I see it. You should be able to use your phone or PC. Just lower their volume to something fairly low.

Steve, I fully agree with you - there were no cell phones during the 70-s.
For me what is strange is that I have worked on several vintage amps/receivers and so far I have never encountered such a thing.
Anyway, maybe the 2235B is a bit different.