hello all,

i'm new here, but have been enjoying the heck out of my time so far.

here's my sob story:

i picked up a fully functioning (save for the tuner and meter lights) 4270 for $40 a couple of weeks back. i've been using it as my main monitoring amp in my little home studio. i have lots of old gadgets that i do weird shit w/, and that's where the trouble started...

i have my monitors connected to the front amp, and haven't put the rears to any regular use yet, but, at this moment, i had the rear pre-outs going into an old 60s reel to reel, and the outs of the tape machine going back into the marantz (by accident, of course!). i've witnessed the feedback loop this causes before- it's a beautiful low end purr that you dare not turn up too high because it looks like it'll blow your woofers apart. however, in this instance, my speakers were turned off, and i was just looking at input meters on the tape machine, wondering what was going on, and not realizing what was going on because my damn speakers were off (there was a reason for this that i won't get into!). like a damn fool, i cranked the marantz all the way up, trying to find the signal i was looking for, and wondering what the crazy stuttering signal was that i saw on my tape machine meters. right about this time, i realized what i was doing (ie blasting the amp w/ a brutal subsonic feedback loop), and stopped. so did the rear amp :no:

if anyone's made it this far in this sad chronicle, my question is this: what is most likely to have crapped out in the preceding scenario? my guess is that the answer is "any one of cornbazillion little resistors, capacitors, or spoonomiters," but i ask just in case someone has some better news.

the good news is the front amp is fine, and still provides 70 lovely watts per channel. but man, it sure does suck to inflict pain on your own selfsame self.

thanks for listening!
rohner

Have you tried swapping around the channel inputs and out puts to see if it is in the amp or pre-amp ????

Barney

Rear channel outputs only work with the BACK PANEL MODE switch in 4 Ch.... But ALWAYS SHUT THE UNIT OFF BEFORE TURNING IT..... But is will 25 WPC not 70WPC.

jk

man,
you know, i knew that, about the 2 different wattage modes, and have even used both (extensively when i was testing the unit). but it sure took me a while to remember that last night when i was busy being real sad. so, yeah- it's fine! i'm an idiot!

thanks for responding!
r
:music:

Well....Last time I panicked and cried wolf .... it was a wolf.... I blew out the 13 v supply with a test probe... First I said "Damn..." then "No way..." then "Yes way...." At least for you nothing was broken...

jk