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Messages - Den.

Quote from: joecool85 on April 11, 2024, 03:53:39 PMI recommend making sure that the input jack is clean and connected well to both line and ground.  If not, it could be only letting some signal through causing these issues.
I will, thanks.
Quote from: Tassieviking on April 10, 2024, 03:54:51 PMI think the best way to go forward would be to inject a clean signal and check the test-points with an oscilloscope.
Being a SMD build it gets a bit harder to check and replace components.

Quote from: g1 on April 08, 2024, 08:04:14 PMI think there may be some confusion now about the 'distorted sound'.
You are getting the proper sound of the Boss pedal using the FX return?

Yes, I am getting the proper DS-1 distorted sound as expected from that pedal.
Also, I neglected to mention that I had also tried a patch cord between the Send and Return jacks with no improvement.
Today I hooked up the borrowed Boss distortion pedal between a guitar and the RETURN jack on the amp and the distorted sound of the guitar was present. Of course all of the amps front panel controls were inoperative. I also tried plugging it into the front guitar input  jack again with the same results as reported in my first message. Does this indicate the problem is in the preamp section?
Quote from: Tassieviking on April 01, 2024, 11:00:20 AMWhen you plugged into the effects return with the guitar did it sound nice and clean ?
Yes, it did.
Do you have another amp you can use?
No. None of my three amps have an effects loop, but I'll ask around for a loaner.
Try an overdrive pedal straight into the return and you are bypassing the preamp again.
My friend will loan me his Boss Dist. pedal.
You have to try to determine if the problem is the preamp or power amp.
Preamp is guitar input on front to the send jack on back.
Power amp is return jack to speaker out.
Thanks, I'll report back.
I'm looking for ideas. My friend's Fender Rumble 100 was working one day and the next day it wasn't. I told him that I would open up the amp and look for something obvious but I didn't see anything suspicious. On the normal channel, with the Gain and Master full up, it barely passes the sound of the guitar. On the Overdrive channel it is extremely noisy; so much so that it can't be used. And, as one starts to push that lower "vintage" tone button you can hear that loud beep tone. Plugging into the Effects Return jack yields a guitar sound that's fixed; a signal that isn't affected by adjusting the Gain, Volume or tone controls. I'll try to post links to the scheme and a short video.

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Quote from: mandu on October 14, 2023, 10:53:46 PMThe picture you posted shows common cathode (connected to the -ve).
The other two are for red or green (or yellow if you power both) goes to the +ve
The limiting resistor may be 1 if wired on the cathode or 2 nos. if wired from anodes.
Thanks for your help.
Quote from: Den. on October 14, 2023, 06:51:47 PMI'm working on my Peavey amp and I need to replace a few 3mm, 3-leg LEDs. In ordering, I have a choice of common cathode or common anode. How would I determine which I need?
I just found these schematics online; perhaps they tell what the LEDs are.
Amplifier Discussion / Common cathode or common anode?
October 14, 2023, 06:51:47 PM
I'm working on my Peavey amp and I need to replace a few 3mm, 3-leg LEDs. In ordering, I have a choice of common cathode or common anode. How would I determine which I need?
The Newcomer's Forum / Re: Shorted IEC line filter
January 01, 2023, 07:16:25 PM
Quote from: joecool85 on January 01, 2023, 05:33:16 PMAssuming that there is a fuse somewhere on the amplifier...
Yes, there is a fuse. A t3.15al250v on the circuit board. And, in other news...

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The Newcomer's Forum / Shorted IEC line filter
January 01, 2023, 01:48:18 PM
Hi. The amp is a three year old Peavey Vypyr. The amp started smoking and the breaker in the power strip it was plugged into tripped shutting everything down. I've determined that there is a short inside the 3Amp IEC EMI filter. You cannot view this attachment.I've found a replacement online that I can order that has the exact same specs. I also found 1A, 6A and 10A rated filters with almost the same specs. The one spec that is different is the inductor spec. My questions are: Is the inductor used in that device what determines the device's AMP rating? And, would there be an advantage with using a replacement EMI filter with a higher (or lower?) AMP rating for this application?  Thanks.You cannot view this attachment.You cannot view this attachment.You cannot view this attachment.You cannot view this attachment.You cannot view this attachment.     
Quote from: Loudthud on July 16, 2022, 05:05:02 AMWhere can I find out more about the EU's Right to Repair regulations ?
I found it here.
Quote from: Enzo on December 28, 2021, 07:00:48 PM
You have a good board?  Stick your ohm meter probes on the good one and see what it measures.
I was trying to avoid having to disassemble it again. But I did. That resistor measured 182K. Replaced the resistor and the cap and now the board functions. Thanks.
Although I have an identical working board I'm going to try to repair this burned circuit board. This resistor (R55) is small and my eyes are getting old. I see brown, grey, yellow, gold 180K 5%, or maybe red, grey, yellow, gold 280K 5%. And, does this cap look suspicious? The cap on the good board looks much "cleaner".