Question about Audio Players & Recorders

1 Answer

Hello, My name is kenny tompkins. i have a problem with my fender bassman amp that no tech in my area can figure out. i was hoping to run this by you and see if you've ever encountered this problem before. The Problem is: the amp sat in storage for about 4 years in reasonable condidtions. The power chord was lost during this time. when i got it out of storage, i bought a new power chord at staples, it was made for computers but fit the chord jack perfectly. when i plugged it in and turned it on , it sounded as good as the day i bought it. i played for about 20 minutes and then the problem appeared. All of the sudden, the amp seemed to grab the guitar signal and pitch bend it toward the top register. much like a car engine slowly rising in rpms. its a hard sound to describe. i turned off the amp and checked all chords. turned it back on and it worked again. this time it took about 30 seconds for the problem to appear. the "sudden pitch bender" thing happened. I thought it might be due to the new power chord but could not find info on this subject. i also thought it might be a heat related issue because it took a few minutes to happen when first turned on. Do you have any advice on this topic? Thanks very much for time. Kenny Tompkins

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 4,234 Answers

I can't confirm this without testing the amp directly, but I would suspect bad capacitors in the pre-amp section. Some of them may have dried out a bit over time. Anyone that is familiar with guitar amps should be able to resolve this for you. The other thing to check is the 12AX7A tubes inside. Swap them around and see if the symptom changes. You may also have a bad tube.

Keep us posted.

Posted on Jun 27, 2008

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How do i change the language from Chinese to english


Set your menu language and region: Find it: Menu > Settings > Language & keyboard > Select locale
For any further assistance here is the link of the user guide

Best Regards,
Motorola Support

Oct 06, 2015 | Motorola Mobility RAZR XT910

1 Answer

Why Protect Sub Woofer warning and then power off by itself

Hello. My name is Dave. If the PROTECT lamp is on, you have a damaged amplifier, which will required a qualified audio tech.


Sep 30, 2012 | Audio Players & Recorders

1 Answer

SI'm trying to find a service tech in the oklahoma city area. Any ideas? I believe I have a short circuit in my sony receiver. It has gone into the "protect" mode several times when I turn it...

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Beyond that, hit the search engines or yellow pages for a local tech.

Aug 23, 2011 | Sony Audio Players & Recorders

2 Answers

Can not conect to the website


Welcome to FixYa, the best online community for tech related issues.

Please elaborate your problem providing us with more details (the name and link of the website) and the web browser you are using to open the website.

Thanks for using FixYa.

Jan 18, 2011 | Audio Players & Recorders

1 Answer


Well where do I begin. First, the polarity switch on the back might eliminate or reduce the hum, but by todays standards the way it functions is a deadly safety hazard (remember all the musicians that got fried in the '60's and early '70's?). That circuitry should be disabled and the unit retrofitted with a 3 prong power cord.

Next, the tube filiments are powered by AC voltage, and there is a control on the chassis for balancing it in order to reduce the hum. It could be toast or mis-adjusted. There could be a tube or other component problem causing your hum. The DC power supply could have faulty filter capacitors.

Another source of problems in these amps are the carbon resistors that introduce static noise in the audio. These should be changed to much better carbon film resistors.

If you are not comfortable working on electronic equipment with voltages in excess of 300VDC you should bring it to a pro audio repair shop.

Apr 16, 2009 | B&K AVR-202

1 Answer

My Fender Bassman 100 amp keeps buzzing.

Part of the power supply is a filtering stage that completes the conversion from AC current to DC. The "cap" is a capacitor that furnishes voltage to help smooth the alternating current that is left from the rectifier stage. These will start to fail over time. While it is a relatively simple repair for anyone that does this for a living, I would not suggest this as your first repair. Expect a parts cost inthe $20 range plus the local labor rate for the entire repair.


Dec 04, 2008 | B&K AVR-202

1 Answer

Hello, My fender mexican jazz bass has a clipping sound when you slap it! It can clip even when turn down very low. I think it could be the front pick up?

Have you tried lowering your pick ups? If they are too close to your stings they could be picking too much. also try playing with the settings on your amp.

Nov 10, 2008 | Audio Players & Recorders

1 Answer

I have a new fender twin amp. It keeps cutting out when playing, get really hot and is very noisey

Sounds like you might have a problem in the output stage and that it hasn't completely blown out just yet. I'd expect it to get worse soon, like not working at all or maybe smoke coming out or both. You might consider seeing a repair tech. soon. Good luck.

Nov 04, 2008 | Audio Players & Recorders

1 Answer

Fender deluxe reverb amp keeps blowing tubes

If it's blowing fuses. It probably has a bad output tube.
If it's blowing tubes. It may have a cracked tube socket.  Also may need to be biased by a tech.

Aug 20, 2008 | Audio Players & Recorders

3 Answers


This sounds like a power supply problem. The high voltage for the tubes is not right. Either you are missing an amplification stage because this or one of the coupling caps is faulty. I'd have to see the unit itself to give you any more details.


Jul 22, 2008 | Audio Players & Recorders

Not finding what you are looking for?
Audio Players & Recorders Logo

Related Topics:

79 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audio Players & Recorders Experts


Level 3 Expert

100140 Answers


Level 3 Expert

4706 Answers

The Knight
The Knight

Level 3 Expert

70943 Answers

Are you an Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides