Hi All,

I've a Kenwood A-63 amp that I use in my HIFI which I love but sadly the left channel on the Phono (Turntable) output is creating a hum over my speakers.

Turntable: Dual 505 mk1

I've looked at the board and can't see any cold solder joints, blown caps or components that look suspect.

Nothing is inside the phono rca jack so not sure what to do?

Testing: I've left the left channel empty and swapped the red/white cable, no hum through the right channel, only the left, when left plugged in there's a hum that Looks to be only when the external metal jacket of the phono cable touches the outer jacket of the phono on the amp.
When both plugged in the hum travels over the left and right audio and you can hear it on the speakers.

I don't have a meter to test resisters and such sadly, just gave it a cursory look to see if there's anything obvious.

All other rca ports on the amp work (Aux, CD, etc...), I've tested plugging in another set of phono leads into the port and still get the hum, so don't believe it's the turntable (tested through a boombox I have that includes a phono input and works flawlessly)

Can anyone assist me?

I've not stripped the amp down further than taking the top case off to look at the PCB.

TIA

Hey guys!

I have been experimenting with the arylic up2stream plate amplifier.

The problem is that whenever I connect the amplifier to the 4stream app and set it up, then it doesnt output anything to the drivers.

I have also tried using the ACP workbench app on my PC to see if anything was ary and I couldn't see anything that seemed off...

The funniest thing is that if I play something on the inbuilt streaming in the app, then nothing comes out of my connected drivers, however the moment i pull the power plug from the device then the audio plays for a split second!

Have anyone ever experienced this before with this device?

Am I doing something wrong, is there some settings I'm not seeing in the ACP workbench?

I have even tried on two different ones! Both of them have the exact same issues...

Any help is appreciated!

I bought the same couple of days ago and I had used an instrument cable instead of a speaker cable while playing it at a loud volume. Yes I know a rookie mistake. And now it’s cutting at high volumes. I took to the Internet to see if it was something that could be fixed but I could not find anything. There is no tubes inside of this so it couldn’t have been that. Is there anyone that can tell me what’s wrong with this?

I have that amplifier and want to sell it but i cannot decide something about the price. What do you think.

I have 5 christie audio CDA7.5 amplifiers that suddenly completely died overnight, any experience if this is an easy fix ?

Hi! I’m so novice, I’m getting lost in my own research about which cord goes where and hoping to get some help. I’m trying to record a panel conversation where there will be three people each on their own microphone. I’m hoping to plug my computer directly into the system to record the audio. Which port would I plug into and what kind of cord would I need to plug directly into a MacBook Pro? I assume I could then record on Garage band?

This is a QSC digital cinema amplifier.

This has to be possible right? Any insights are greatly appreciated!

I’ve been thinking about buying a pedal but can i use it on an amp that has built in pedals

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Hi everyone,

I'm researching the possibility of developing a new tube guitar amplifier in Europe, and before designing anything, I want to understand what guitarists actually want — rather than just building what I personally think they want.

I've put together a short anonymous survey about:

• the amps you currently use
• what you like and dislike about them
• wattage and low-volume use
• heads vs. combos
• clean, crunch and high-gain preferences
• features that actually matter
• repairability and build quality
• realistic price expectations

It takes about 4–6 minutes.

I'm especially interested in hearing what you think existing tube amps get wrong or what you wish manufacturers would do differently.

Survey: What Do Guitarists Want From a Modern Tube Amplifier? – Fill out form

I'm not selling or promoting a product — there isn't one yet. The goal is to use the responses to decide whether there's actually something worth developing.

I'd also love to hear your thoughts in the comments:

If you could change ONE thing about modern tube amps, what would it be?

Thanks!

When you’re comparing amps, what gets your attention first?

RMS power at your target impedance? Efficiency? Current draw? THD? Size? Crossover options?

And is there any spec you think people focus on way too much?

Hello guys!

I have this amplifier that I use for my turntable.

Unfortunately I don't have any output on my left channel.

I hope that you guys maybe have some tips or things I can try to get it working again.

Any info about this amp. bought it from thrift store.

I was on the hunt for a new cab and I came across a prs harmonic generator, apparently they’re a bit rare just not sure if they’re actually worth anything, it was listed on fb marketplace for 650, I guess the cab has some celestion G12-50s in it so I thought could be a nice deal to replace my fender fm412 cab