Warning: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in ..../includes/class_bbcode.php on line 2958

Warning: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in ..../includes/class_bbcode.php on line 2958

Warning: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in ..../includes/class_bbcode.php on line 2958

Warning: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in ..../includes/class_bbcode.php on line 2958
Fender ProTube Twin-Amp reverb feedback - Page 2
Page 2 of 3 FirstFirst 123 LastLast
Results 20 to 38 of 40

Thread: Fender ProTube Twin-Amp reverb feedback

  1. #20
    Join Date
    Jan 2009
    Posts
    357
    Post Thanks / Like

    Default Have you tried changing tube V3

    Quote Originally Posted by Mick
    Dude, I'm afraid to even look at a capacitor!

    If it comes down to modifying the circuitry the way you describe, then I'll take it to someone like you that knows what an ohm is.
    Well thought it might help. On the chance changing a tube could have an effect changing V3 may have an effect. This is used as a cathode follower for the clean signal to the reverb and the output. If its cathode impedance was higher then normal it could cause a problem like this. Hope this helps.

  2. #21
    Join Date
    Apr 2009
    Posts
    35
    Post Thanks / Like

    Default

    Okay, I tried swapping out all of the preamp tubes, one at a time.

    No joy...

    I'm about 99.999% positive that it's not a microphonic preamp tube causing the feedback.

    So, I pulled out the reverb tank...



    ...but I didn't see any obvious problem with the tank, like a loose wire, broken spring, or whatever. So I cleaned the RCA connectors where the cable goes into the tank, then put it back in the amp.

    I still have nasty feedback when the reverb is turned up.

    Could the reverb transformer be causing the feedback? Is there some way to test it to see if it's within specs?

    What should I try next?
    See my photos at: micknewton.smugmug.com

  3. #22
    Join Date
    Apr 2006
    Location
    NW Missouri,
    Posts
    4,097
    Post Thanks / Like

    Default

    I think Jim P gave a fair evaluation of his prognosis after perusing the schematic of the amph. I would suggest taking it to an amph tech to confirm (or disprove) his theory as to the cause of the feedback.
    Guitars
    Wilburn Versatare, '52 FrankenTele(Fender licensed parts), Fender USA Roadhouse Strat, Fender USA Standard B-bender Telecaster, Agile AL 3000 w/ WCR pickups, Ibanez MIJ V300 Acoustic, Squier Precision Bass,
    Amps
    Ceriatone Overtone Special, Musicman 212 Sixty-Five, Fender Blues Jr., Peavey Classic 30, Fender Super Reverb, Traynor YCV-40 WR Anniversary w/ matching 1x12 ext. cab, Epiphone SoCal 50w head w/ matching 4x12 cab (Lady Luck speakers), Avatar 2x12 semi-open back cab w/ Celestion speakers
    Pedals
    Digitech Bad Monkey, Digitech Jamman, DVM's ZYS, Goodrich volume pedal

  4. #23
    Join Date
    Apr 2009
    Posts
    35
    Post Thanks / Like

    Default

    Quote Originally Posted by oldguy
    I think Jim P gave a fair evaluation of his prognosis after perusing the schematic of the amph. I would suggest taking it to an amph tech to confirm (or disprove) his theory as to the cause of the feedback.
    Pay someone that knows what they're doing to fix it, eh? That's quite a concept you got there!

    Nawt yet... Methinks I'll try to verify that all the existing components are within specs before I throw in the towel.

    I checked the tubes.
    ! checked the tank.

    What's next? Maybe pull the chassis and have a look inside? How do I do that without electrocution? How do you drain capacitors safely? Lick the ends?
    See my photos at: micknewton.smugmug.com

  5. #24
    Join Date
    Apr 2009
    Posts
    35
    Post Thanks / Like

    Default

    C'mon people! Doesn't anyone have any helpful suggestions?
    See my photos at: micknewton.smugmug.com

  6. #25
    Join Date
    Jun 2008
    Posts
    94
    Post Thanks / Like

    Default

    Some prednisolone for your tongue
    No other idea than the tubes, the tank and the tech - sorry.

  7. #26
    Join Date
    Apr 2009
    Posts
    35
    Post Thanks / Like

    Default

    Quote Originally Posted by Gutmann
    Some prednisolone for your tongue
    I found a website that tells you how to drain capacitors without using your tongue.

    How to drain the filter caps

    What I'd like to see is detailed instructions on safely removing the chassis on a Fender Twin. Ever done that?
    See my photos at: micknewton.smugmug.com

  8. #27
    Join Date
    Apr 2009
    Posts
    35
    Post Thanks / Like

    Default

    I wonder if my problem might be similar to this...

    Cold solder joints causing amp to "feedback" whether a guitar is plugged in or not.

    Hmmm...
    See my photos at: micknewton.smugmug.com

  9. #28
    Join Date
    Apr 2009
    Posts
    35
    Post Thanks / Like

    Default

    In case anyone is following this...

    Someone from another website suggested replacing the RCA cable. Apparently, they had had a situation where a cheap unshielded cable caused reverb feedback. So, I removed the tank and connected it with a new RCA cable. It worked! With the reverb tank sitting on a table next to the amp and the reverb dial at max, no feedback!!!

    Unfortunately, putting the reverb tank back in the amp case causes it to feedback as before. Even with the new RCA cable installed.

    Somehow, the magnetic field of the two 12" Eminence speakers is interacting with the reverb tank to cause the feedback. It's like the tank is microphonic, but only when it's near the speakers. I tried placing various materials between the tank and speakers (rubber mat, wood, etc.), but nothing helped. Although a 1/2" thick piece of oak did change the frequency of the feedback.

    The search for a cure continues...
    See my photos at: micknewton.smugmug.com

  10. #29
    Join Date
    Apr 2009
    Posts
    35
    Post Thanks / Like

    Talking Problem solved!

    I installed a new reverb tank and that fixed the problem. No more feedback, even with the reverb set to maximum. I'm happy.

    With the new tubes and reverb tank this amp is awesome! I have to be careful with the volume though because If I turn it up too much it'll blow out every eardrum in the place, and the windows too!
    See my photos at: micknewton.smugmug.com

  11. #30
    Join Date
    Nov 2007
    Location
    Kent, UK
    Posts
    2,353
    Post Thanks / Like

    Default

    Glad you cracked it, Mick

    Quote Originally Posted by Mick
    I have to be careful with the volume though because If I turn it up too much it'll blow out every eardrum in the place, and the windows too!
    Yup, that's a Twin
    Electric: Fat strat > Korg PB > TS7 > DS1 > DD-20 > Cube 60 (Fender model)

    Acoustic: Guitar > microphone > audience

  12. #31
    Join Date
    Jun 2008
    Posts
    94
    Post Thanks / Like

    Default

    That's great. Have fun with this great amp!

  13. #32
    Join Date
    Jan 2006
    Posts
    861
    Post Thanks / Like

    Default

    Your determination paid off. Good work!

    I'm in Portland, but where the heck is Deer Island. I've lived in Oregon for 30 years and have never heard of the place before.

  14. #33
    Join Date
    Apr 2009
    Posts
    35
    Post Thanks / Like

    Default

    Thanks guys!


    Quote Originally Posted by aeolian
    Your determination paid off. Good work!

    I'm in Portland, but where the heck is Deer Island. I've lived in Oregon for 30 years and have never heard of the place before.
    The huge metropolitan portion of Deer Island is located on Hwy 30 between Portland and Astoria. It is 36 miles from downtown Portland, and 60 miles from Astoria. It consists of one gas station/convenience store on the highway and a small church. Part of Deer Island actually is an island on the Columbia River. Most of the island is cattle ranch. My wife and I wanted to move away from the hustle and bustle of big city life, so we built our house a few miles away from town. It's about a mile from the highway, in the hills overlooking the river. We have no neighbors close by, so I can play my guitar as loud as I want without anybody complaining. Which is a very good thing considering how well I play.


    Here's some pics that I took of our house this winter, and my wife Becky, and me, and Mr. Kitty (a stray tom cat we took in just before it started snowing).
    See my photos at: micknewton.smugmug.com

  15. #34
    Join Date
    Jan 2006
    Posts
    861
    Post Thanks / Like

    Default

    Quote Originally Posted by Mick
    Here's some pics that I took of our house this winter, and my wife Becky, and me, and Mr. Kitty (a stray tom cat we took in just before it started snowing).
    Now I know where Deer Island is. Less than 40 miles from me and yet I've never heard of it! You do know that Eurotubes is in Portland near McLaughlin Blvd, right? But if you have to drive that distance to pick something up you may opt for Bob shipping the tubes to you.

    I remember the December snow we had, I have a few pictures of a lounge chair with snow piled up to the seat in my backyard. I checked out your photo albums, beautiful photography. Do you do that for a living? I enjoy taking pictures too, but if I come up with a decent one it is more due to luck than to skill.


  16. #35
    Join Date
    Apr 2006
    Location
    NW Missouri,
    Posts
    4,097
    Post Thanks / Like

    Default

    Glad to hear you got the Twin fixed, Mick. You should post a pic or two of it sometime. With your photography skills, you could make it look sweet.
    Guitars
    Wilburn Versatare, '52 FrankenTele(Fender licensed parts), Fender USA Roadhouse Strat, Fender USA Standard B-bender Telecaster, Agile AL 3000 w/ WCR pickups, Ibanez MIJ V300 Acoustic, Squier Precision Bass,
    Amps
    Ceriatone Overtone Special, Musicman 212 Sixty-Five, Fender Blues Jr., Peavey Classic 30, Fender Super Reverb, Traynor YCV-40 WR Anniversary w/ matching 1x12 ext. cab, Epiphone SoCal 50w head w/ matching 4x12 cab (Lady Luck speakers), Avatar 2x12 semi-open back cab w/ Celestion speakers
    Pedals
    Digitech Bad Monkey, Digitech Jamman, DVM's ZYS, Goodrich volume pedal

  17. #36
    Join Date
    Apr 2009
    Posts
    35
    Post Thanks / Like

    Default

    Quote Originally Posted by aeolian
    Now I know where Deer Island is. Less than 40 miles from me and yet I've never heard of it! You do know that Eurotubes is in Portland near McLaughlin Blvd, right? But if you have to drive that distance to pick something up you may opt for Bob shipping the tubes to you.
    Yup, I bought a complete set of tubes from Eurotubes. I put in my order on Friday and the tubes got here the very next day. Talk about fast service! Bob was very helpful on the phone too. A great guy.

    Quote Originally Posted by aeolian
    I remember the December snow we had, I have a few pictures of a lounge chair with snow piled up to the seat in my backyard. I checked out your photo albums, beautiful photography. Do you do that for a living? I enjoy taking pictures too, but if I come up with a decent one it is more due to luck than to skill.
    I'm glad you like the pics. Nice if you to say so. No, I'm not a professional photographer, although I've been doing it for almost 40 years. I'm really just an avid amateur. I have done a few paid photo shoots though, and I've sold usage rights to some of my photos to various companies and even some well known journalists. I actually make my living as a senior software engineer. Our company creates communications and network management/reporting software for large corporations.

    I just recently took up the guitar again after a long time away. I learned and played for a couple years when I was a kid (late 60's), but I never got very good. I didn't really play again until my son bought me a guitar and amp for my birthday a year ago last March. Since then I bought myself an American Deluxe HSS Strat, this Twin amp, and just today my UPS buddy brought me a pedal board and my first two pedals. A Big Muff Pi and a Boss ML-2. Way fun!

    BTW, if you like making digital photos then you might enjoy DPChallenge.com. They have several photo challenges going on all the time with various subjects. No prizes, just virtual ribbons, but it can be a lot of fun if you have a thick skin and don't take it too seriously. You can register and enter open challenges for free, or buy a membership if you want to enter member-only challenges and have a portfolio. My dpc user name is Mick.
    See my photos at: micknewton.smugmug.com

  18. #37
    Join Date
    Apr 2009
    Posts
    35
    Post Thanks / Like

    Default

    Quote Originally Posted by oldguy
    Glad to hear you got the Twin fixed, Mick. You should post a pic or two of it sometime. With your photography skills, you could make it look sweet.
    Thanks oldguy! I'll give it a try soon. I've actually been thinking about trying to recreate some of Fender's ad shots.
    See my photos at: micknewton.smugmug.com

  19. #38
    Join Date
    Apr 2006
    Location
    NW Missouri,
    Posts
    4,097
    Post Thanks / Like

    Default

    That sounds like a cool idea. I've always liked this one, even though it came out two yrs. before I was born................don't know if it's the dachsund or the raybans...................


    Guitars
    Wilburn Versatare, '52 FrankenTele(Fender licensed parts), Fender USA Roadhouse Strat, Fender USA Standard B-bender Telecaster, Agile AL 3000 w/ WCR pickups, Ibanez MIJ V300 Acoustic, Squier Precision Bass,
    Amps
    Ceriatone Overtone Special, Musicman 212 Sixty-Five, Fender Blues Jr., Peavey Classic 30, Fender Super Reverb, Traynor YCV-40 WR Anniversary w/ matching 1x12 ext. cab, Epiphone SoCal 50w head w/ matching 4x12 cab (Lady Luck speakers), Avatar 2x12 semi-open back cab w/ Celestion speakers
    Pedals
    Digitech Bad Monkey, Digitech Jamman, DVM's ZYS, Goodrich volume pedal

Page 2 of 3 FirstFirst 123 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •