FDP Home Page / FDP Forum / FAQ's

The FDP is made possible by the following companies and individual members like you.
Please use the links below to show them we value their sponsorship.

Antique Electronics Supply

Guitar Center

WD Music

Amplified Parts

Jensen Loudspeakers


Advertise here

Yellowjackets Tube Converters

Musician's Friend

Apex Tube Matching


* God bless America and our men and women in uniform *

* Illegitimi non carborundum! *

If you benefit and learn from the FDP and enjoy our site, please help support us and become a Contributing Member or make a Donation today! The FDP counts on YOU to help keep the site going with an annual contribution. It's quick and easy with PayPal. Please do it TODAY!

Chris Greene, Host & Founder



Find musicians
in your area!
  Search the Forums  

FDP Forum / Fender Amps: 1985 - Current / Join The Twin-Amp Club! (Pro Tube Series) 2x12 100 Watts

Previous 20 Messages  
Grey Goose
Contributing Member


Sep 29th, 2011 06:00 AM   Edit   Profile  


It's sounds like a "94 Twin". I had one, very nice amp. I just called it a Pro Tube Twin Amp as well. Some people called these "Evil Twin", I didn't care for that. You can call it whatever you like.




Sep 29th, 2011 06:37 AM   Edit   Profile  

Grey Goose is right. The official Pro Tube Twin Amp was the series produced after 2000. One input only and no selectable impedance switch. Fender confused a hell of alot of people with this particular amp. Great amp! not many people own these and now they have replaced the twin amp with the Supersonic 100 watt combo.



Bobby Roadrunner
Sep 29th, 2011 09:01 AM   Edit   Profile  

So, I must have a 94 twin amp??? I forgot to mention no tremelo an a 600 ohm line out. I bought this on eBay from a guy by cape cod, ma he seemed like a guru type when I drove 3.5 hours each way to pick it up. I won it as a head unit in some kind of fender head cabinet. It looks official. Originally it didn't sound very good, but I lined the feature set. Over a couple of years time with help from you guys on the forum, I finally got it to sound better than my 72sf and my 77 sf, which has been modded to 63 type circuit.

Basically, I upped the filter caps a bit, reduced the negative feed back by 6 db, reworked the presence control, and played with a lot of tubes.

I built a birch ply cabinet for the speakers. I tried a lot of them, jbl,different emi, vintage emi, evm 12l, Utah.

I ended up with 1 swamp thang and 1 wizard both from eminence. No matter what they always seem to match up to the character of the amp. They seemed to supply the missing something I was looking for.

Also, (I did a tube taste test in amp forum) and tried a wide variety of tubes. Again for this amp, I ended up with tungsol
Kt66 set to 08 based on the test points. The preamp tubes area mix of jj and eh.

Since I have a separate cabinet for the speakers, I am going to try a ported back to see how the loading goes. I hope to get to it today.

Thank you for your comments, so I guess I have a 94 twin amp, correct ???



Bobby Roadrunner
Sep 29th, 2011 09:04 AM   Edit   Profile  

Also, sorry for some of the typo's. I am doing this on my IPad and I can't get back to check any mis-spellings !



Sep 29th, 2011 01:41 PM   Edit   Profile  

AVSpecialist, You do have the 94 Twin and yes it is a great amp in its combo original form. Sounds like you have created a cool Hybrid version of your own! The 94 Twin does have the selectable impedance switch and two inputs...the Pro Tube twin Amp only has one input and both internal and external speaker jacks are 4ohm and parallel. These amps are pretty hard to find out in the market because so many people don't like the weight and probably don't need 100 watts for what they are doing. I like it particularly because of its weight and I play everything loud as hell so it works great for me. I have no problem "lugging" the thing anywhere (hell, I'm 50 years old) and it shows up as a beast where ever I play so it's cool to the look as well. Anyway, enjoy your Frankenamp!



Bobby Roadrunner
Sep 29th, 2011 04:34 PM   Edit   Profile  

Thanks ozzy-junkie: I'm with you, when I play, I like to play loud. It's how we did it back in the70's. Black Sabbath and Zeppelin. I often like to hook up my 2 twins to my Roland gr33 for stereo and the twin amp in the center as a main. 3 twins are WOW!!!!

Grey Goose
Contributing Member


Sep 29th, 2011 05:16 PM   Edit   Profile  

It sounds like both of you lads like to "bring the pain"

Very cool amps!



Bobby Roadrunner
Sep 29th, 2011 06:45 PM   Edit   Profile  

Grey Goose, the beauty of this much power, is that I can close my eyes and be transported to Madison Square Garden and be Jimmy Page. I was at the 73 concert. Back then everybody had stacked loud stuff. I love it. The bands of my day (high school and later) all had stacked stuff.

Well anyway, I hope my amp let's me stay in the club. One thing for certain, the flexibility of this amp is among the best. I can loop and connect to my hearts desire. Since getting it set up, I actually prefer it right now to my Marshall jvm 410 setup.



Sep 30th, 2011 06:32 AM   Edit   Profile  

AV...You are right on the money. I grew up playing the loudest stuff our there..Black Sabbath..Iron Maiden..Zep and so on. I love tearing up some Pat Travers stuff too as His tone is something to marvel at! I like to stack em high as well. I have my HRD sitting on top of the Twin as an extension cab. Wish i still had my '72 Super six reverb....I want to put either a 2-12 bandmaster cab or a 2-12 supersonic cab under my Twin and i will probably get a Weber Z-match impedance matching box to make it work. I still "half heartedly" laugh at all these posts about an amp weighing too much. at 50 years old, I am in the gym 4 days a week and surf big nor'east swell here in florida when we get it so I stay in shape and have no problem hauling around my twin. To me the heavier the better...kind of like good quality furniture..the flimsey crap wont last!

(This message was last edited by ozzy-junkie at 06:34 AM, Sep 30th, 2011)



Bobby Roadrunner
Oct 19th, 2011 04:24 AM   Edit   Profile  

Ozzy: sorry for the late reply, I have been working a lot. I agree with you. I don't mind the weight. I am at the gym only 3 days.

In your twin amp, what power tubes are you using. It originally called for 5881 or 6l6wgc. I tried several 6l6 types and stumbled on trying some Tungsol kt66, that bias like a 6l6 according to the tube store reviews. Quite honestly, I am not sure other than lower power why 5881 are recommended?



Oct 19th, 2011 07:23 PM   Edit   Profile  

Av. I am running winged C's in my twin...hot as hell tubes and sound unreal...tungsol preamp tubes as well.



Bobby Roadrunner
Oct 21st, 2011 05:04 AM   Edit   Profile  

Ozzy: I had the winged c in mine they were good, but for some reason the kt 66 in mine just put the amp over the top. I ended up with an 08 for the bias. I played with the amp for a couple of years, then put it aside for several months. I was actually going to sell it, but I had a lot of time and money into it. I decided to give it another chance. I played with different power tubes and tried the wizard and swampthang combo and it just came together. Also I think I mentioned I had reduced the neg feedback by 6 db and changed the prescence control circuit to give a more upper mid boost. I am glad I kept it. Also as I think of it I upped the filter caps. I had the work done by a tech I know after some conversations telling him what results I was trying to achieve.

Now the amp is great for 60/70 rock and not a laid back as my other twins, but not as aggressive as my Marshall 410 H.


Austin, TX

Oct 9th, 2014 12:17 PM   Edit   Profile  

I have a 2003 Fender Twin Amp with a small issue. When I flip it to 1/4 power (25w) mode, the power tubes redplate.

There are no other issues with the amp. Any thoughts? Thanks.


United States

Oct 21st, 2014 10:21 AM   Edit   Profile  

Hey guys. I have a pro tube fender twin amp that I got about 8 years ago and I've never needed anything else! However now that I'm playing at smaller venues I would like to swap out the preamp tubes for lower gain ones. Which preamp tubes (out of the 8) effect the clean channel?



Oct 1st, 2015 01:37 PM   Edit   Profile  

Hello everyone. I got one of these nice amps, love the sound.

Got slight problem with my one, the tremolo is always on. No matter how much I stomp the footswitch. Led goes on and off, but the tremolo stays on. Doesn't actually bother me, because I never use the tremolo and I have speed and intensity knobs turned to zero.

But still, some day I might wanna fix this. What do you think, could this be a relay issue or what?



Bobby Roadrunner
Feb 11th, 2016 07:44 PM   Edit   Profile  

Speaker update for my 94 Twin Amp. I use a Baltic Birch 2x12 sealed back cabinet I made. it's 30 wide 26 high and 12 deep. It's all T-nutted together and solid as a rock. I put in a Marshall speaker switch in it also, so I can pick either speaker or go series or paraell. My newest compliment is 1 Eminence Tonker and 1 Weber Blue Dog. The Eminence is more tight and less harmonic and more clean. The Weber adds the right amount of harmonic content and is deeper in the bass and brighter but smoother in the highs. Also I have found that the right compliment of tubes and bias in this amp makes a big difference also.

(This message was last edited by avspecialist at 02:05 PM, Feb 27th, 2016)



Jul 9th, 2016 03:21 AM   Edit   Profile  

Dear members!

My Twin Amp made in 2002, has all 12 tubes replaced with new ones Groove Tubes. The reverb tank it's new, also. However, the amp with reverb at 10 seems to have a shorter reverb compared with a Twin Reverb at 5! Is that normal?

I want to use massive reverb and the twin amp could not get it. is there something wrong with my amp, or have I choosed wrong the amp to buy?

Thanks in advance!

Previous 20 Messages  

FDP Forum / Fender Amps: 1985 - Current / Join The Twin-Amp Club! (Pro Tube Series) 2x12 100 Watts

Reply to this Topic
Display my email address             Lost your password?
Your Message:
Link Address (URL):
Link Title:

Moderators: Chris Greene  Iron Man  reverendrob  

FDP, LLC Privacy Policy: Your real name, username, and email
are held in confidence and not disclosed to any third parties, sold, or
used for anything other than FDP Forum registration unless you specifically authorize disclosure.

Internet Application Development

Copyright © 1999-2018 Fender Discussion Page, LLC   All Rights Reserved