Amp humming 94
The Twin was introduced in , two years before Fender began selling Stratocaster electric guitars. The amps are known for their characteristically clean tone. The Twin has seen a number of revisions since its introduction, both internal and external, with its designs sometimes varying greatly from one year to the next. The Cyber Twin, which combined a tube amp with a digital processor, was introduced in January
===We are searching data for your request:
Wait the end of the search in all databases.
Upon completion, a link will appear to access the found materials.
Content:
TDA7294 100W Audio Amplifier
Repair and disassembly information for amplifiers in home audio systems. Ben Eisenman. I have an A Behringer power amp that will not power up. I replaced the power cord and fuse with known working ones, with no result.
Next, I took the fuse I tested in it and plugged it back into a working amp of the same model, which ran fine so I know the amp isn't just killing fuses.
I would have put this as a comment, but needed more words. I would have edited my original post, but couldn't upload pics on an edit. Every once in a long while, the lights on the front of the power amp will light briefly and then die, but 98 percent of the time, nothing.
I have opened it up, and here is the power path:. There is a black wire that goes straight into the heart massive heavy cylinder of wires of the amp. There is another black wire with a capacitor I think? This wire goes to the switch in the front, which is a simple push button.
There is a blue wire coming out of the switch back into the heart of the amp, completing the circuit. The rest of the components led board, input boards, output boards, volume knobs seem irrelevant because it's not getting power at tall but I could be wrong. Here's a pic of the entire setup:. Well ur not dealing with dc here so a loose ground wouldnt normally be the problem a loose neutral would b more like it but honestly id hav to look at it to tell u for sure but i would take a multimeter and check fir voltage u hav the right idea follow the curcuit from power source untill u find the loss of power then when u find where ur loosing power u can sesrch for the issue at that point if mits a bad part or a loose wire u can find the issue wherever u loose power.
I don't have an answer, but question. Before, I could turn the volume up to about 45 or so, now if it goes past 19 in which makes it hard to hear many movies it will cut completely OFF!
Please Help :. You most likely are invoking the protection circuit to prevent power from damaging the rest of the unit or your toroid is open. Good news is the partial schematic your unit is available online. I'd start with testing the output of the "Heart" Thats a toroidial transformer It looks like the yellow and orange pairs feed the side boards.
Does the amp have a charger dc input? It started to hum but not power on using the AC home plug. I had a dc charger lying about 12v 3a so i thopught id try it. Worked like a dream, powered up and i now have my sound back. Just a thought. February 20 by Andi Sadler. I happen to live in your area. Is there a way we could meet up and I could take a look at the amp for you.
You could bring it by my church either this coming new years or this saturday night. Let me know so I can come early Removed and checked the front ON switch for power continuity with power turned unplugged, just use a multimeter on continuity check. Checked to see if any of the electrolytic capacitors had "popped tops" if they had blown. Use extreme caution, there is live V leads in areas that you can touch with your hand! I recommend using only 1 hand while anywhere near a large voltage, incase of any shock, the current wont go through your heart.
Use a multimeter to check the voltages coming out of those two power cables, they should be somewhere around 70Vrms.
Everything checked out ok, so I turned power off. Plugged everything back in where is was supposed to be, and turned the power back on. And it worked!! There was probably a loose connection or an oxidized lead.
I could use the Lord's help in fixing my Bugera tube amp. It worked fine for 8 months, then today while playing it, it begins to hum with the power light flickering. I turned it off. Then a minute later I foolishly turned it back on, the speaker was really loud, then it just went off.
It won't come back on. This is a grounded collector Amp. The two large caps form a center tap for the power supply which is connected to the speaker terminal. So This is cap coupled amp.
Therefore if you drive high currents of low frequencies the large caps will fail The signal will just fade away. The lower the impedance of your load speakers the faster this will happen. Replacing these caps should put you back in service Cap coupled amps sound bouncy Pulses are accelerated and then fall off So the choice of replacement cap will effect the tonal quality of the amp.
The best choice would be splitting the required value over several small caps connected in parallel. Note replacing the caps requires removing the amp circuit boards I would recommend replacing all the screws you remove because they will disintegrate on contact. Replacing the twisted output wires with OFC similar temp rated wire or even untwisting the OEM wire can't hurt either. I suggest taking good clear pictures of everything before you pull it apart.
Do one side at a time. Have a container for all the bits. Avoid bending the power transistors leads once you remove the screws holding the circuit board from the heat sink. Chris Green chrisgreen. Is it a tube amp? Fix Your Stuff Community Store. Back Answers Index. Amplifier Repair and disassembly information for amplifiers in home audio systems.
Ben Eisenman Rep: Any ideas? View the answer I have this problem too Subscribed to new answers. Is this a good question? Yes No. Voted Undo. Score 7. It sounds like loose ground wire. Hi Ben, and thank you so for your spiritual encouragemant.
Chosen Solution. Cody Rep: 10 3 3. Here is what I did: 1. Pray that God would be glorified through anything I do 2. Plug it in to make sure it doesnt just turn on, it didn't so unplug it 3. Removed and checked the two fuses on each of the amplifier circuit boards 5. Removed and checked continuity of the power connector through that fuse 6. Used a multimeter to check every easily accessible diode 7. Checked to see if any of the electrolytic capacitors had "popped tops" if they had blown 8.
Praised the Lord for His love. Was this answer helpful? Score 8. This amp has no tubes This amp has huge potential, by design, but crippled by implementation. Score 1. Chris Green chrisgreen Rep: Good Luck, Chris. Score 0.
RadioShack Rep: 47 4. Deoxit those connections and look for broken spring clips on those molex connectors! Add your answer Ben Eisenman will be eternally grateful.
AMP Research 20-03289-94 Power Step Running Board Motor
Users browsing this forum: Google [Bot] and 7 guests. Page 94 of [ posts ] Go to page Previous Posted: Mon Mar 25, pm. Hi, Surprisingly, the standard LMs will often work. But then again
Tips on how to stop loudspeaker interference
US UK. Switching between stores will remove products from your current cart. AMP Research. Item : Good Fast! Easy to follow the parcel. Only registered users can write reviews. Please log in or register.
Fender Twin
Hum level in a well designed SE amp. Hi How low a hum level is possible in a well designed SE amp at the 8 ohm output? I use 94 dB speakers and even 0. Not in the listening position but with the ear close to the woofer. That is the level in the moment in my KT SE mono blocks at the 8 ohm output 4 ohm output is about 0.
VT30 loud humming....
Login or Sign Up. Logging in Remember me. Log in. Forgot password or user name? Music Electronics Forum.
Transformer hum on new power amp
The zero-feedback single-ended triode amplifier has gained a following from music lovers who feel that high-quality sound reproduction at natural levels is more important than reproduction at loud levels. To these listeners, midrange quality is more important than room-shaking bass. The single-ended amplifier uses a single output tube, or several in parallel that act as one, to amplify both the positive and negative polarity portions of the music signal. In contrast, most amplifiers are configured so that the positive polarity of the signal is amplified by one output device and the negative polarity is amplified by another device. This second type of amplifier is termed push-pull, and the music signal is handed from one device to the other, and back again with each cycle of the frequency being amplified. Triodes are used in single-ended circuits because they are the most linear voltage amplifying devices available, and they have low output impedance for good speaker damping without requiring negative feedback. Although triodes are more linear than other devices, they do exhibit compression at the high-voltage, low-current portion of their transfer characteristics. This distortion could be largely eliminated by using negative feedback, but most listeners find that feedback introduces more problems than it solves.
Menu Menu. Search Everywhere Threads This forum This thread. Search titles only. Search Advanced search….
I tried everything and put my phone close to my microphone and it got stronger. I know its inconvenient but one less distraction while making music. TRY IT!! I tried numerous things that this thread recommended and have a furman m-8Dx but nothing seemed to help. I put my cellphone in the next room and the noise immediately decreased. I even bought two Himalayan salt lamps that are good for helping to block radiation and placed them on each side of my interface.
For most players, the pendulum of guitar-pickup fashion seems to swing between humbuckers—be they vintage, PAF-style or something more modern—and some type of take on Strat- or Tele-style single-coils. But lurking somewhere in the middle is a pickup type that's often overlooked: the Pstyle single-coil. Gibson invented the P and used it in many guitars between the pickup's debut on through the dawn of the humbucker a decade later—and thereafter it became a mainstay on once-budget-priced models such as the Les Paul Junior or Les Paul Junior Special. Though the humbucker's powerful tones and noise-free performance largely overshadowed the P, a vocal minority of players has long preferred the P's crisper tones, clearer mids, and potentially ragged edge. But the P isn't always rude-sounding. Consider the Beatles, who used Pequipped Epiphone Casinos throughout the band's middle years.
A good choice for phase inverters, reverb drivers, and general preamp use. This tube offers low noise, low microphonics, and warm smooth tones at a great price. It can also be used to replace 12AX7 tubes in position 1 to reduce gain. Perfect for reverb and driver circuits.
You are sure to be right