There's at least 1000 volts running around in that amp. Even if you had a schematic I'd hesitate to encourage you to poke around inside it. Perhaps you can find a technician or a very experienced DIYer who can help you diagnose the problem. I suspect there's something wrong with the wiring that's causing the amp to oscillate.
Have you tried swapping in the other 100TH to see if the problem persists?
Have you tried swapping in the other 100TH to see if the problem persists?
704V is more than sufficient to kill the unwary.
I recommend finding someone qualified enough to work on this amp.
It is possible that the RCA jack is no longer grounded or it is just oscillating due to a design issue as alluded to previously or some other issue.
That interconnect does not look like a particularly good idea.
I recommend finding someone qualified enough to work on this amp.
It is possible that the RCA jack is no longer grounded or it is just oscillating due to a design issue as alluded to previously or some other issue.
That interconnect does not look like a particularly good idea.
I try to change 100th tube with one from other monoblock,same promblem on same monoblock.
I put now linn majik kontrol preamp between streamer and monoblock. For now works fine but we will see trough out of day. I try this combination before but stay same but buzz was much much quieter and happens only few times trough the day.
Is it possible that streamer make this problem? But i dont understand way just one monoblock buzz,no matter how i connect and with wich cable. I tray all possible combinations and always,always just left one make buzz,so my conclusion is that is to the amp,not streamer.
Its a quantum fizik 😔
If anyone have any sugestion what can i try in amateur realm.
If i dont find solution i will go again to this guy who fix amp to give another look.
Now he change som resistors on AC input line,they'r bad.
And he play it 2 days at home with no problem. Guy who sell it to me also never have this problem. Maybe is problrm in my other gear?
Big thanks to all help and sugestion do far!
Cheers!
Here's pic of components.
I put now linn majik kontrol preamp between streamer and monoblock. For now works fine but we will see trough out of day. I try this combination before but stay same but buzz was much much quieter and happens only few times trough the day.
Is it possible that streamer make this problem? But i dont understand way just one monoblock buzz,no matter how i connect and with wich cable. I tray all possible combinations and always,always just left one make buzz,so my conclusion is that is to the amp,not streamer.
Its a quantum fizik 😔
If anyone have any sugestion what can i try in amateur realm.
If i dont find solution i will go again to this guy who fix amp to give another look.
Now he change som resistors on AC input line,they'r bad.
And he play it 2 days at home with no problem. Guy who sell it to me also never have this problem. Maybe is problrm in my other gear?
Big thanks to all help and sugestion do far!
Cheers!
Here's pic of components.
An "innocent eye" reader of this thread cannot be certain whether the problem is inside of one amplifier or is outside, in an external wiring (and those strange unshielded cables raise alarms). A definitive test would be to exchange amplifiers, leaving all external wiring in place, and re-test. Then, does the same speaker have the problem, or does the other? All things the same, except amplifiers switched.
FWIW, these kinds of problems are almost always bad wiring, often intermittent, and again the strange unsheilded cables cause alarm. Maybe not causing your problem, but raising a caution flag.
All good fortune,
Chris
FWIW, these kinds of problems are almost always bad wiring, often intermittent, and again the strange unsheilded cables cause alarm. Maybe not causing your problem, but raising a caution flag.
All good fortune,
Chris
Thank you! I try this few times,always same problem on same monoblock,whatever speaker,cable,position,L or R output,electric phase (becuose i hav 3 phase electric instalation),always same monoblock.
What i notice now,is that 100th tube on bad one makes less light then on good one. Try to switch tubes,but result same,on bad one tube give less light,easily seen from 6,7m also. Like 50% light. Can that tell something?
No matter wich tube,always glow less on bad amp.
What i notice now,is that 100th tube on bad one makes less light then on good one. Try to switch tubes,but result same,on bad one tube give less light,easily seen from 6,7m also. Like 50% light. Can that tell something?
No matter wich tube,always glow less on bad amp.
Good! You have ruled out a lot of possible "confounders", the first and most important part of troubleshooting. Given the high danger level the next step really needs to be a trip to your amplifier tech guy or gal. You have done the important step of locating the problem to a specific amplifier chassis.
All good fortune,
Chris
All good fortune,
Chris
If the amplifier is oscillating, it can draw a lot of power to produce a very strong signal, sometimes in the supersonic range that we can't hear. If that is the case here, the drag on the power transformer could be reducing the filament power to the tube. Another possibility is that the filament supply itself has gone bad, causing the tube to not function properly.
From the pictures, however, it looks like the tube on the left is built a little differently and showing more of the filament glow, so it may just be that.
Chris has the right suggestion, I think, which is to take it to a tech or consult with the original owner.
From the pictures, however, it looks like the tube on the left is built a little differently and showing more of the filament glow, so it may just be that.
Chris has the right suggestion, I think, which is to take it to a tech or consult with the original owner.
Wow! Gotta say, that is some beautiful artistry. Maybe because I know it, but maybe not, it looks like it comes from a particular real place, something increasingly rare in the homogenized modern world.
All good fortune,
Chris
All good fortune,
Chris
Sorry, I meant to say that the tube on the left looks like is is revealing less filament glow because of the slightly different plate structure.
Its not to the diferent construction in tube becuose when i chenge the place of tube,same result. Always left one have 50% less glow.
So it can be to do voltage drop on that monoblock?
Im gona call a guy ewho fix amps to see if he want to look one more time.
So it can be to do voltage drop on that monoblock?
Im gona call a guy ewho fix amps to see if he want to look one more time.
I call a guy who fix amps,he said for diferent intensity of glow is due to diferent voltage but he said its not the reson for this problem.
He addvice to shortly connect the input on monoblock when it starts to buzz,to see if the problem is outside or inside monoblock.
He said if buzzig continue after short connecting input,then is definitly problom inside of monoblock. So,i tray 3 times for now,buzz stay after shortconnecting,so its,like grovergardner say,definitly something wrong with this monoblock.
Problem is inside.
So,i think i make a good detection job,now its all to the smp fixig guy. Next week i go to him,he is really nice guy. I hope he will find problem.
If anyone have sugestion what to tell him to chek,messure,please let me know.
I will inform you how things going,and houpfully what is problem when he finds it.
Maybe will someone in future have help from this conversation.
Big thanks to all of you nice people ready to help!🙏
He addvice to shortly connect the input on monoblock when it starts to buzz,to see if the problem is outside or inside monoblock.
He said if buzzig continue after short connecting input,then is definitly problom inside of monoblock. So,i tray 3 times for now,buzz stay after shortconnecting,so its,like grovergardner say,definitly something wrong with this monoblock.
Problem is inside.
So,i think i make a good detection job,now its all to the smp fixig guy. Next week i go to him,he is really nice guy. I hope he will find problem.
If anyone have sugestion what to tell him to chek,messure,please let me know.
I will inform you how things going,and houpfully what is problem when he finds it.
Maybe will someone in future have help from this conversation.
Big thanks to all of you nice people ready to help!🙏
Explain again is the hum coming from the amp or the speakers. It looks like the hum reduces before you make contact with the transformer. It may be the hand near the OPT changes the oscillation but the hum is actually coming from the mains transformer/chassis. Its possible you have VHF oscillation occurring which is changing the supply current. Place a VHF radio near the amp to see if you can pick anything up. Also try AM bands too.
If there is a visible symptom , 50% less glow , presumably a fault in filament supply or who knows , the first obvious idea should be that is somehow correlated with the oscillation , buzz or what it is . Until it is solved is kinda useless to talk about other possible causes .
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