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Post subject: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Sun Apr 07, 2013 6:54 pm
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I just removed the 2 inner 6l6 power tubes to begin to tame this beast. My understanding is that it cuts the wattage down to about 50 and increases the ohms from 4 to 8. I also understand that my amp output and speakers are mismatched 8/4.

Another amp is out of the question, I love my Twin and the way it sounds. I also looked into Attenuators, but Aracom's start at $700, which is way out of my price range (I know others will work, but then it's back to the 8/4 situation and if the solution below works, I'll go with a Rockcrusher) , so I've decided to play with the tubes.

Can I replace the two 8ohm 100w speakers with 16ohm 50w speakers and be back to where I should be in regards to impedance? I searched and googled, but could not find an answer to this specific question. If the answer is yes, what speaker would you suggest? Thanks in advance.


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Post subject: Re: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Sun Apr 07, 2013 7:11 pm
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Hi eshanew,

You are correct. If you pull two output tubes, the amp then "wants to see" an 8 ohm load instead of the 4 ohm load as it does with all four output tubes. So, yes you could replace the two 8 ohm speakers with two 16 ohm speakers to re-match the impedance.

However, the amp is not going to be dramatically lower in volume by doing all of this. If you are going to use an attenuator anyway, just use an attenuator and save yourself the trouble and expense of the tube pulling and speaker swap.

Really, your not going to get much breakup from a TRRI even at high volume anyway, so what's the point? Just turn it down and it sounds the same at low volume as it does at high volume.

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Post subject: Re: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Sun Apr 07, 2013 7:34 pm
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Thank you for the reply. Your response was what I was hoping for.

I'm also going to be putting a JJ 12DW7 in V1 and a EH 12AY7 in V2 to to help bring volume down even more, which in theory should allow me to dial back the Attenuator a bit less (better transparency). Currently I have the inner tubes out and replaced V6 with the 12AX7 I pulled from V1 and as you said I didn't notice much of a difference volume wise, but am hoping with all the pieces in place this will be a bit different.

Increasing the output to 8 ohms will also allow me up to use the Rockcrusher without having to mod or add anything more into the chain. I've read nothing but good things about it and it's a fraction of the cost of the Aracom.

Thanks again.


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Post subject: Re: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Sun Apr 07, 2013 7:44 pm
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Forgot to mention that I'm not doing this to get the amp to break up, I'm just trying to make it more manageable while retaining the qualities that a twin is known for.


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Post subject: Re: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Sun Apr 07, 2013 8:53 pm
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Not an easy task, I hope that you achieve the desired results. While you might succeed in making the amp more manageable, the changes that you have proposed will likely alter the whole sound/dynamics of the amp to something quite unlike a TRRI. Maybe a good sound none-the-less.

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Post subject: Re: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Sun Apr 07, 2013 9:18 pm
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eshanew wrote:
Forgot to mention that I'm not doing this to get the amp to break up, I'm just trying to make it more manageable while retaining the qualities that a twin is known for.


The "qualities that a twin is known for" are LOUD and CLEAN.

Bottom line?

You bought the wrong amp, Hoss.

Arjay

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Post subject: Re: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Mon Apr 08, 2013 9:27 am
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Retro I'm doing something commonly referred to as light modification, which is very common in the guitar community. Would you tell a guy who decided that he wanted to beef up his Strat or Tele by putting humbuckers or stacks in it that he bought the wrong guitar, no probably not. What I'm doing is the same thing.

Comments like yours get old, try living outside the box and seeing what a piece of equipment is capable of instead of just using it for what it was intended for. If everyone thought like you we'd still be living in the dark ages and we sure as hell wouldn't have Hendrix, Vai, EVH, The Beatles, etc.


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Post subject: Re: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Mon Apr 08, 2013 11:37 am
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Have a ball, hotshot.

:roll:

Arjay

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Post subject: Re: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Mon Apr 08, 2013 9:26 pm
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In case anyone is following along...

I currently have the 2 inner power tubes pulled, replaced V2 with a EH 12AY7, and the 12AX7 is now in V6. The amp is much warmer and I can play it all night with the volume at 2.5 and if I was home alone 3 is not out of the question.

If you are a bedroom player or just need less gain out of the Twin, I highly recommend giving this a try. It's only going to cost you $15 and a little bit of time.

But it's still not were I'd like it to be with a distortion pedal put into the mix and am thinking of putting some Sheffield 1200's in (similar to EV30's) or some Weber Thames.


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Post subject: Re: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Tue Apr 09, 2013 3:35 am
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I tried pulling 2 power tubes on mine to see if it got quieter. The answer was NO. It was still a loud amp and the volume linearity didn't alter much. Could maybe turn it up half a notch more. So for the effort and having pretty much the same control it was not worth it. I put the 2 tubes back

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Post subject: Re: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Tue Apr 09, 2013 4:38 am
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You may want to try this. Replace the two outer 6L6GCs with very tough 6V6GT (like JJ 6V6S). Keep the two inner sockets empty. Rebias the amp to 18-20mA per tube. See if this helps the OD issue.

Problem with the amp is the trannies. They will NEVER saturate and give you the OD you seek that a smaller amp can yield. The amp, even with 6V6S will prolly not approach a nice Princeton or Deluxe Reverb.

Sorry. :(


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Post subject: Re: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Tue Apr 09, 2013 11:26 am
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Aaron, if you read through the thread you will also see that I have changed the values of my preamp tubes as well as pulling 2 power tubes. I assure you doing this lowers the volume considerably while retaining the character of the Twin. Preamp wise my next step is to put a JJ in V1 and a low gain 12AX7 in V6, which will bring levels down a bit more.

As far as getting this thing to break up, from what I read you can get a great distortion tone by using different speakers, such as V30's, Weber's, Fanes, and a few others. What makes the Twins sound brittle are speakers, which are too bright. Again I'm using pedals for distortion, I do not want the Twin to break up on it's own.


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Post subject: Re: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Tue Apr 09, 2013 1:49 pm
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This is not the tone I am going after, but I would bet that at the heart of the combo listed on this page you will find a Twin. Last I knew the Custom Shop manufactured the EVH brand.

http://www.evhgear.com/new2013/


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Post subject: Re: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Tue Apr 09, 2013 1:58 pm
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Hey I have a Twin reissue that I recently bought used and took through my own de-brittling process. (Hey is that a new word?) I have a 68 super which is my favorite amp but I don't like to take it out and about. So I picked up this TRRI with a road case so it's very easy for 2 guys to carry. This case is so tough you could probably tow it behind your car LOL. Anyway, I went with removing V1 tube, using a JJ 7571 in V2, and went with a pair of Texas Heats. This Mp sounds great now. No way it's breaking up before 6 on the dial with a strat though. But the cleans are super warm & rich, with boat loads of sustain. No ice pick. I use it at about 3 -4 for rehearsals and gigs which is pretty loud. I guess these guys are just trying to let you know that these amps are clean & loud, or loud & clean. Those are your 2 choices. My super breaks up at much more reasonable volumes and also sounds incredible doing it. I have turned this Twin all the way up and it does break up pretty well but it's not the same kind of thing, IMO. I think you should keep the TRRI and add a Deluxe or a Vibrolux to your stable. The more the merrier!


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Post subject: Re: 65 Fender Twin Reverb RI Speaker replacement.
Posted: Tue Apr 09, 2013 2:23 pm
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Hello, Ned, I wish I could add another to the stable, but at this time that's not an option for me. I'm in the tube learning phase and am having a lot of fun seeing what I can do with this beast. I plan on using a JJ in V1 and am keeping the EH 12AY7 in V2, so I can put an ABY in front and get the most out of the amp.

I've read that the JJ's are a little gritty, so my plan is to set Channel 1 a little darker and meaner and keeping Channel 2 brighter and warmer. I played around with this today without the ABY and was very pleased with the results, it's just too bad none of my local shops carry the ABY I want.

After taking a peak at the EVH cab, I'm wondering if the Twin's amp section will slide in to it. In my opinion this would be an amazing mod if it works. After reading about guys plugging the Twin into a closed back cab with excellent results, I closed the back of mine as much as I could and was very pleased. Everything was tighter and more focused. I had to dial the bass knob down a bit.

I realize this amp is loud and clean and that I'm not using it for what it was "made" for, but I also sense that it's capable of much more with a little tinkering. I could be wrong on this, but I thought I remember reading that a lot of amp manufactures based their amps off the Twin.


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