Technics SU-8080 phono stage

darkpeak · 2nd May 2011, 07:55 PM

Hello there,

I am a newbie.

I've just got hold of an old Technics SU-8080, and I have a slight problem. When I switch the input selector to Phono 1 or Phono 2 with nothing plugged into the phono sockets at the back, I get a loud, pulsing signal. I don't have a turntable yet, so I plugged my tape deck into the phono sockets. Merely switching the deck on stops the signal. Tape playback through phono is fine, apart from the distortion you would expect.

What's going on? It seems as though this signal won't cause me a problem, but it's worrying. Does anyone have an explanation?

Many thanks.

All the best,

Richard Christian

lineup · 2nd May 2011, 08:40 PM

This is normal.
You hear an empty capacitor get current to load.
It is because of the design.

When something attached the cap gets loaded.
And you hear nothing.

darkpeak · 2nd May 2011, 08:54 PM

That's good to know. Many thanks for the reply.

2nd May 2011, 07:55 PM	#1
darkpeak diyAudio Member Join Date: May 2011	Technics SU-8080 phono stage Hello there, I am a newbie. I've just got hold of an old Technics SU-8080, and I have a slight problem. When I switch the input selector to Phono 1 or Phono 2 with nothing plugged into the phono sockets at the back, I get a loud, pulsing signal. I don't have a turntable yet, so I plugged my tape deck into the phono sockets. Merely switching the deck on stops the signal. Tape playback through phono is fine, apart from the distortion you would expect. What's going on? It seems as though this signal won't cause me a problem, but it's worrying. Does anyone have an explanation? Many thanks. All the best, Richard Christian

2nd May 2011, 08:40 PM	#2
lineup diyAudio Member Join Date: Dec 2005 Location: the north	This is normal. You hear an empty capacitor get current to load. It is because of the design. When something attached the cap gets loaded. And you hear nothing. __________________ lineup

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2nd May 2011, 08:54 PM	#3
darkpeak diyAudio Member Join Date: May 2011	That's good to know. Many thanks for the reply.

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