Question about Amplifiers & Preamps
My Technics pre amp SUA900S, keeps switching between channels when I'm nowhere near it. Think it could be a dodgy rotary switch, in which case, where can I find one?
SOURCE: Crown D-150 Amp
Sounds like something was spilled into the amp and it got into the controls, switch and switch knob. As for the knob, lean the amp forward about 45 degrees and dribble hot water into the space behind the knob slowly. Try to keep the water from going inside the amp. Eventually, the knob should come off with some pulling & twisting. Once you get it off, replace both pots and the switch. If water gets into the amp just dry it up with paper towels, etc. and let it continue to dry while getting the new parts. HTH, Emory
Posted on Oct 05, 2007
SOURCE: channel has switched off.
Make shure speaker wires are not crossed at amp or at speaker terminals. Check balance control is at center. Check sound with headphones to see if final amp to speakers is the problem. Try switching imputs on back panel from right to left see if same speaker is on,.Try all loudness controls and tape dubbing buttons to see if any are dirty.
Posted on Nov 03, 2007
Most likely it can be fixed. One of the things that could stymie this is if there is a part that is not available. It also would be nice if a service manual or diagram is available though that might not be essential (a genuine maybe here) if the repairer is familiar with preamps in general. Of course who would repair it and what it would cost are prime considerations. I likely would be able to repair it were I still in business but I am retired and that is not the case. Nor do I believe that even were I not, that this would be possible due to Fix-Ya rules (can't solicit business).
Posted on Jul 03, 2009
The Amplifier must have a high impedance input for the turntable to be connected. Now most of the present day amplifiers do not have this input but only the regular aux input which is designed for a larger signal . But the turntable outputs is quite low and so it requires an amplification of high order. What you can do if you need to play the turntable is to have first a preamplifier with a high impedance which is available even inkit form and can be fitted on to your system. The preamp output can be shared into the input of the source selector maybe with a switch and you willl be able to fix two RCA sockets to accept the input of the phono. This will work fine provided the shielding is done well to avoid the high feedbacck to oascillate and cause noise, the premap must be housed in a shielded cabin. On the other hand you may have to buy a universal amplifier so that the phono input is present. Definetely nothing better than a designed input. So think and decide. hope I could help; Good day
Posted on Aug 10, 2010
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