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No sound.... (Read 925 times)
nico
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No sound....
05/27/14 at 22:23:22
 
I need some help guys.
One of my Zen mono amps [SE84C] stopped working last night.
All tubes glowing, no sound.
Problem is defenately the amp; switched amps, switched cables etc. to locate the problem.
Opened it up but nothing to see there what could cause it.
HOW TO CONTINUE?
HELP!

Nico

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beowulf
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Re: No sound....
Reply #1 - 05/28/14 at 03:43:42
 
1. Did you switch tubes?

2. Did you check/swap fuses?

3. Did you check outlets?
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Lonely Raven
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Re: No sound....
Reply #2 - 05/28/14 at 05:13:23
 
Lighting up, but no sound coming out sounds like the input tube or related circuit is having an issue, or the volume pot possibly. Try swapping the input tube, try flicking the bias switch a few times, try cranking the volume knob left right a few times and see if it comes back. That will hopefully help you narrow down the fault.

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« Last Edit: 05/28/14 at 05:14:06 by Lonely Raven »  
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nico
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Re: No sound....
Reply #3 - 05/28/14 at 06:47:12
 
Just woke up over here. Thanks for the suggestions guys but yes, I already did what you suggested.
Tried two new sets of tubes, swapping cables , left amp to the right etc.
problem def. is in the amp itself.
It simply stopped playing without any extra noise, smell or whatever...
I know the basics of electronics but this is a mystery to me.
Any more idea's?
[since I'm in The Netherlands it's not so easy to send the amp over to Steve ]
Nico
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marky
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Re: No sound....
Reply #4 - 05/28/14 at 09:32:24
 
I had a similar issue last week on bridged Rachaels. Took some hunting down to find a signal tube on the phono amp had just eased out a shade.
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Lonely Raven
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Re: No sound....
Reply #5 - 05/28/14 at 17:06:23
 
Nico, since it's happening on both channels, you need to look at all points where the signal goes through *both* sides of the amp at the same time, I still think that's only input tube or volume pot.

I can't recommend opening it up and checking it yourself, but you might want to poke at the input tube socket, and verify the signal wires if you do open it up again. Make sure nothings come loose or looks burnt.

Beyond that, it might be time to either send it to Steve, or find a local tube amp tech to give it a look over. It's a very simple design, and any tube amp tech worth his salt should be able to diagnose it with an input signal and multi-meter.

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« Last Edit: 05/28/14 at 17:07:10 by Lonely Raven »  
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4krow
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Re: No sound....
Reply #6 - 05/28/14 at 18:53:59
 
Nico,
To recap, you own 2 mono amps, 1 of which is not working. The one not working has tubes glowing, so you know it is getting power. You have checked cables and tubes, finding no fault with them. There is one more thing to consider. The RCA input jack may have problem. You can take the cover off and pull on the wires going to the jack. These wires can be physically stressed when pulling off a tight interconnect cable, ESPECIALLY if the interconnect was being twisted trying to pull it off.
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Lonely Raven
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Re: No sound....
Reply #7 - 05/28/14 at 19:06:49
 

Duh, for some reason I was assuming two regular SE84C that were simply run bridged for mono. If they are dedicated monoamps, then the whole signal path is suspect.
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Lon
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Re: No sound....
Reply #8 - 05/28/14 at 19:19:39
 
4krow wrote on 05/28/14 at 18:53:59:
Nico,
To recap, you own 2 mono amps, 1 of which is not working. The one not working has tubes glowing, so you know it is getting power. You have checked cables and tubes, finding no fault with them. There is one more thing to consider. The RCA input jack may have problem. You can take the cover off and pull on the wires going to the jack. These wires can be physically stressed when pulling off a tight interconnect cable, ESPECIALLY if the interconnect was being twisted trying to pull it off.

Good call. The interconnect itself could have a problem as well unless that has been eliminated as a problem.
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« Last Edit: 05/28/14 at 19:30:10 by Lon »  

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4krow
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Re: No sound....
Reply #9 - 05/28/14 at 19:53:57
 
Lon, well thanks. The twisting of the RCA connector itself is what I think is suspect. I just repaired a unit 3 days ago that the customer was using tight interconnects(monster cable turbin connectors), and to get them off, he was twisting the interconnect RCA . Well, as he twisted it, the AMP chassis mounted RCA twisted as well. This of course, caused the internal wire to detach. Also, I should mention that the chassis RCA signal connection was actually pushed in by forcing the interconnect into the CHASSIS mount RCA.
 As an aside, I am in the process of replacing ALL 4 sets of inputs of my 34.3I because of the fact that the signal connection on some of them has come to be too loose for a good connection. Um yah, I am a BIG believer in high quality (not necc high priced) RCA connectors for the chassis of any component, and often change them out from stock.
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Lonely Raven
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Re: No sound....
Reply #10 - 05/28/14 at 20:35:35
 
What chassis mount RCA do you like over stock?

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4krow
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Re: No sound....
Reply #11 - 05/28/14 at 21:35:57
 
LR,

  Oh boy is that ever a hard question. There is a mountain of junk out there, and another mountain of over-priced parts as well. Just when I found an RCA that fit the bill, I can no longer get them. They had a solid body that was rhodium plated, and the fit was correct as well. I have tried the 'CMC' brand RCA jacks from China, and man, let me tell you, they are sized waaay too tight. Then the material is something that I tried to drill, and well, it wasn't copper, it wasn't brass, but it was hard! No more of them. Occasionally at Parts Connexion, there are some that work out to be ok. It is hit and miss, but I do not like the small 3/8" diameter type. I prefer 1/2" diameter, with a short barrel. I have some on the way from China that I have not used before. They should be here shortly. Yes, my fingers are crossed.
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Decware 34I.3 integrated amp/Forte' 3 bass amp/Velodyne SMS-1 bass mngmnt system/Decware ZOB speakers/BESL subs/Emotiva ERC3 CD player/BPT 3.0 power cond. PS Audio P500
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Lonely Raven
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Re: No sound....
Reply #12 - 05/28/14 at 21:51:25
 

Cool! Tell me how they fair.

Also looking for better power inlet for my Decware amps - Steve isn't happy with them either, so I've been keeping an eye out for a good IEC inlet with solid connectivity, that actually fits a standard IEC plug!
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4krow
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Re: No sound....
Reply #13 - 05/28/14 at 22:05:24
 
LR,

  If you were to get into the inner circle at PS Audio, they might tell you where a good IEC inlet can be had. I know of no other company that strives for great connections.
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SteveC
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Re: No sound....
Reply #14 - 05/28/14 at 22:44:45
 
This suggestion is only half serious....

you know how you can install some appliances, like dishwashers, by direct wiring to the box, or wiring a pigtail to the box and plugging it in?  To eliminate weakness at iec contacts, you could hardwired a cord/plug (a nice one) into your amp (haven't thought about aesthetics or where it could come out, etc).  It's one way of avoiding the problem entirely. No connector would have a better electrical connection.  Would have to remember to handle the fuse.  And you save having to buy a female iec plug if making your own cords.

Again, only half serious, but it seems like one of those "old way, better way" kind of situations.

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