check input and output connections, soldered and unsoldered. Check isolation between case and all jacks and plugs. Turn DMM to AC and see if you have any oscillation across output.
Ok i Will assemble two new boards for you, and test Them. For free.
I need it to be good for you. And for my reputation.
- Sonny
I need it to be good for you. And for my reputation.
- Sonny
Sonny, you have nothing to prove. It's been tested and approved by others. I'm the first time amp builder, anything can happen. Please, don't rush with boards, builds and tests.
I'm taking a a tea to recover from power up stress and I'm going to check for oscillation afterwards.
I'm taking a a tea to recover from power up stress and I'm going to check for oscillation afterwards.
Sonny,
I have mine I will send him if he cannot get it worked out. I bet we can. I have ten other amps to listen to, so no big deal. He jst has to promise to get it back, as I want to compare it to VSSA 😀, its little brother.
Side note. I will try changing electro's from included to FG to see if experience any change. Lazy Cat seems so impressed. Gotta try.
I have mine I will send him if he cannot get it worked out. I bet we can. I have ten other amps to listen to, so no big deal. He jst has to promise to get it back, as I want to compare it to VSSA 😀, its little brother.
Side note. I will try changing electro's from included to FG to see if experience any change. Lazy Cat seems so impressed. Gotta try.
I know them, aussie amps use them also. But the lifecycle is low on them.
I believe they are good, and they have an huge impact when located In the feedback loop.
You Can use them.
Couple of pics before the amp is back on the bench:
http://img827.imageshack.us/img827/1015/imagehlsz.jpg
http://img198.imageshack.us/img198/2277/imagesnb.jpg
http://img827.imageshack.us/img827/1015/imagehlsz.jpg
http://img198.imageshack.us/img198/2277/imagesnb.jpg
Another chanel is up and running!!! Must be something with connections, wires or something alike on the first one. I'll check the cap.
I'll take on the buzzing channel tomorrow. Can't express enough gratitude for both of you Buzz and Sonny.
Did you have any other trouble firing up the channel with the buzz? Does your second channel work properly? Think about it with a glass of wine. Step away and retsckle tomorrow.
Second channel - impeccable. I'm sure channel one buzz has something to do with connections. Gotta recheck that tomorrow. It's getting late here.
Maybee i have been unclear or i have forgot to mention .. Those caps has to be 100pF with ezw20n/p20-z. The 47pf is for ezx10n/p20.
I am sorry if i have not mention it.
I am sorry if i have not mention it.
Ahhhh - this is news to me also Sonny.
My amps have not been oscillating but would you expect this to impact on the sound quality ?
mike
Tomas: Yes that is correct C12 and C13.
Mike: The problem is, if you have cable that is not screened correctly, you could pickup HF on the signal cables as the amp has a bandwidth of more than 2MHz. So by making the capacitors 100pF for for EZX10 and 220pF for EZW20 will reduce the bandwidth to 50% making less sensitive to HF injection on the signal cable.
Mike: The problem is, if you have cable that is not screened correctly, you could pickup HF on the signal cables as the amp has a bandwidth of more than 2MHz. So by making the capacitors 100pF for for EZX10 and 220pF for EZW20 will reduce the bandwidth to 50% making less sensitive to HF injection on the signal cable.
Currently building regulated supplies. When finished will compare yours & my amps again and check out this bandwidth thing.
But my instinct is to keep widest possible bandwidth and filter ( and possibly buffer ) the incoming signal if necessary.
Will report when I make tests
mike
But my instinct is to keep widest possible bandwidth and filter ( and possibly buffer ) the incoming signal if necessary.
Will report when I make tests
mike
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