2. amps-preamps
  3. 1222489027

cd plays without preamp

OK so I just get my new Cambridge Audio 640 cd player shipped, I hook it up to replace my old unit and turn on CD player listening to great music and realize I forgot to turn on my preamp , only the amp was on. meanwhile I was adjusting the volume and tone controls and they were working ALL with the preamp off. Can someone explain this to me. The equipment besides the CD is ST-70 triode/ pentode amp by Bob Latino, Dynaco Pat5 bifet preamp,(which will be replaced in a few days shipping with a Cary) and a pair of Klipsch (Crite) Cornwalls. The Cambridge by the way is a very nice sounding CD player for the modest system
rcme53
trcnetmsncom
431 posts
 
Hi Rcme53,

Sorry, as I meant no harm and my apologies if I offended you. I honesty don't know why this would happen. I'm sure someone with technical expertise will post soon.

All the best,
Tom
rcme53 OP
15 posts
 
Tom, I appreciate that.
slikric3000
638 posts
 
Now that sounds weird, The Outter Limits or The Twighlight Zone weird.
mr_man
72 posts
 
Will this still occur with the preamp unplugged?

...Maybe something wrong with the power switch?
musicnoise
377 posts
 
Are there tone controls on your preamp, or a method of selecting different sources? If there are and these work then I would agree that perhaps the unit is actually on. If not (and you could always just unplug to to eliminate that possibility) without looking at the schematic it would be impossible to say for sure - but - it is likely that your volume control is a potentiometer and you are feeding the signal through the rest of the passive components (resistors, coupling caps, feedback resistors). I would be curious to know if the volume is roughly what it was when the unit was obviously on, for the same position of the volume control.
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