JLM AUDIO

Something is shorting and overloading the SMPS power supply so it is in hiccup protect mode. If using s TREX or any power supply etc check you have 24v going to the 1290 module. I'm using the power supply that came with the kit ... It wouldn't be an issue with the kettle lead would it ? Change of f...

......I have a new problem with my 1290. The output transformer seems to be making a clicking noise.....and the leds are flashing on and off in time tiht the output transformer clicks. I think it is probably a power thing as I have tried swapping everything round and the click follows the main gain...

......I have a new problem with my 1290. The output transformer seems to be making a clicking noise.....and the leds are flashing on and off in time tiht the output transformer clicks. I think it is probably a power thing as I have tried swapping everything round and the click follows the main gain ...

….just an additional thought….

I had a similar issue with a gssl diy build and it turned to be a grounding issue. Would a grounding problem possibly cause the symptoms I have described?

Check the audio level at the output pots between outside pins with pot pulled out full CW and a AC meter and a 500Hz or 1khz tone. If the voltages are different then it is the preamp section. If they are the same it is the output amp and / or transformer. Hi. Ok, so just to be sure we are on the sa...

Does that channel click or pop while switching gain steps. The 470uF cap on the BAX83NV occasionally become leaky causing pops. No. No pops at all. Only the symptoms I mentioned previously. It seems like it must be something pretty small because the faulty channel is only slightly quieter and the n...

Are the gains the same as minimum gain and change at some point in the gain switch stages? Same for the noise is it the same at minimum gain and change at some point in the gain switch stages? Not sure what 820R cap you mean as 820R would normally be a resistor? Hi! The db difference is consistentl...

Hello. First post. Looking for some help regarding a second hand 1290 I bought with some issues. Basically, thing are functioning Ok , however one channel is a couple of Db quieter than the other and it also has faint white noise in the background.The volume also appears to be slowly fluctuating ev...

Hello. First post. Looking for some help regarding a second hand 1290 I bought with some issues. Basically, thing are functioning Ok , however one channel is a couple of Db quieter than the other and it also has faint white noise in the background.The volume also appears to be slowly fluctuating eve...