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EICO ST-70 crosstalk problem

F

Fleischer

Well-Known Member
I just got my ST-70 back from a recapping from my tech. Works fine on Phono, but there seems to be a problem when I hook a CD player to the tape inputs. If the CD deck is playing a disc while I turn the selection knob from TAPE/AUX to MX/AUX, FM, or AM, I can still hear the CD playing, albeit at half the volume. My tech suggests that I simply turn off a component before selecting another input. So, my questions are these: 1) Is this normal with an EICO ST-70? 2) What could be causing this? 3) What is the fix for this?
 
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I haven't used mine in quite a while, but I don't remember there being a problem with crosstalk, mine wasn't rebuilt, and had a little hum.
 
I have an ST 70 that I rebuilt years ago and I don't remember having a problem with crosstalk. It sounds to me like you have some sort of internal shielding problem.
 
Could be contamination on the selector switch, or just an overly hot output on the CD player. Could also be poor lead routing from the jacks to the selector switch. Its worth having a look inside and comparing it to the pics in the manual.
 
gadget73 said:
Could be contamination on the selector switch, or just an overly hot output on the CD player. Could also be poor lead routing from the jacks to the selector switch. Its worth having a look inside and comparing it to the pics in the manual.
Click to expand...

And, also, did you clean the selector switch by spraying it with something? Unfortunately I have learned the hard way to be very stingy with contact cleaner. It can leave a conductive film on the phenolic wafer and "Maybe" the signal is leaking over. Another suggestion by many manufacturers "back in the day" was to make shorting plugs for the unused inputs. But heck, are you going to stream music from several sources at the same time? I just may be a characteristic of the amplifier. You might pursue lead dressing first.

Just a thought...
 
Crosstalk when multiple inputs are active is not uncommon in many different units.
The switching and internal design are not made well enough to eliminate it.

To "fix" it, only run one source at a time.
Stop the CD when using other sources.

It boils down to, "why are you playing Xxx, while listening yo Yyy?"

In the time of tubes, life was calmer and slower. The was time to allow the tubes to warm up and to choose an LP to play or a tape, then load those. Or select tuner and dial in a station, if it was broadcasting. One thing at a time, in its own time.

Today, life is insane and its more of "everything all the time, at the same time, at any time"

The two worlds of time are different.
 
blhagstrom said:
Crosstalk when multiple inputs are active is not uncommon in many different units.
The switching and internal design are not made well enough to eliminate it.

To "fix" it, only run one source at a time.
Stop the CD when using other sources.

It boils down to, "why are you playing Xxx, while listening yo Yyy?"

In the time of tubes, life was calmer and slower. The was time to allow the tubes to warm up and to choose an LP to play or a tape, then load those. Or select tuner and dial in a station, if it was broadcasting. One thing at a time, in its own time.

Today, life is insane and its more of "everything all the time, at the same time, at any time"

The two worlds of time are different.
Click to expand...

Kinda what I was thinking too...
 
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