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FDP Forum / Fender Amps: 1985 - Current / FENDER DRRI Questions

yardbird mac

Ohio - USA

Apr 22nd, 2012 08:57 PM   Edit   Profile   Print Topic   Search Topic

I have several questions concerning the FENDER DRRI.

#1.How many of you have installed a Weber 12F150 in place of the JENSEN C12K. How does it (the Weber) sound after "broken in"?

#2. How many of you (if any) bridge both channels with an A/B/Y box to avoid clipping the bright cap in the vibrato channel. I read on another forum that some people have opted for the A/B/Y setup instead of clipping the bright cap.


Contributing Member


Praise him with the strings
Apr 23rd, 2012 07:00 AM   Edit   Profile   Print Topic   Search Topic

I have not done #2, but I do play with a lot of speakers. I Love my DRRI even stock, probably one of Fenders best IMHO. I now am running a Cannabis Rex and love it. Made a very nice improvement. Sometimes at late night I have to play low, crystal clear with a good punch.



Apr 23rd, 2012 07:26 AM   Edit   Profile   Print Topic   Search Topic

Regarding question 1: Have not changed the speaker.

Regarding question 2: Be forewarned .I tried an a/b/y box and when I had my guitar going to both channels (both a and b selected) the sound I was getting was thin, nasally and really crappy. Maybe it was due to the type of a/b box I was using.

6 Cylinder Slim

New England

Shoes for Industry
Apr 23rd, 2012 09:13 AM   Edit   Profile   Print Topic   Search Topic

I tried some different speakers in my 1x12 PR clone combo. The 50w Weber 12F150 is a bit darker than the Jensen RI. I think it's an option to consider if you want to tame the overall high end a bit.

Contributing Member

Garland, TX

vintage RCA output transistors
Apr 23rd, 2012 09:16 AM   Edit   Profile   Print Topic   Search Topic

The two channels on a DRRI are out of phase. (Most Fenders that have a reverb channel and a normal channel are like that.) If you use an A/B/Y box (or just a jumper cable to run the channels together) you'll run into the problem that dbluesband mentioned. It's most noticeable when both channels are set to about the same volume.

A/B/Y's work great on Bassmans and non-reverb Showmans but not DRRI's. (One of the DRRI Fritz mods puts the channels in phase, but if you're going to open up the amp to modify it you might as well just clip the bright cap.)

Contributing Member

Tucson, Arizona USA

Bottom Sucker
Apr 23rd, 2012 09:36 AM   Edit   Profile   Print Topic   Search Topic

To properly run the two channels with an A-B-Y switch you need to buy the pedal that has the polarity switch option that sets both amp channels in phase.

This is what I use and it makes the amp sound even bigger.

Radial Twin City A-B-Y

Doc Sarvis
Contributing Member

USA/Salt Lake City

Tuned Strings and Tight Lines
Apr 25th, 2012 09:32 PM   Edit   Profile   Print Topic   Search Topic

#1 Celestion Gold.

#2 Never. I pull the preamp tube out of V1 to make the vibrato/reverb channel sound hotter.

yardbird mac

Ohio - USA

Apr 28th, 2012 07:13 AM   Edit   Profile   Print Topic   Search Topic

I've decided to continue using the Weber 12F150 in this amp. I don't think it's broken in yet. To my ears, it sounds a little "cleaner" and more articulate than the JENSEN C12K (but that speaker isn't broken in yet either).

I tried the A/B/Y with the Radial Twin City. I tinkered with the polarity switch to get the "correct" sound. It worked, but I wasn't real impressed with the tone. I might try it again though. I tried this experiment on a day when ALL of my guitars/amps sounded like crap and my playing was really "off".



Apr 29th, 2012 04:58 AM   Edit   Profile   Print Topic   Search Topic

...you know I read so many threads on tube and speaker swaps and more often than not the experiment seems to result in going back to what was started with! As a result I am glad I just spend my time reading threads rather than diving in and copying!

HOWEVER - the one thing that I have found that actually makes a difference with any of my 9 Fender Boutique and vintage amps - is use of a TRANSPARENT DRIVE Pedal. If I ever want a hotter or cleaner or 'Browner' tone, I simply resort to one of those and it saves me £$£$£ and hours!!

I have a couple of go-to: I use either the excellent Danelectro Cool Cat Transparent Drive for Hot-to-Brown tones and/or a PROEL DS10 for ultra-clean to Celestion Blue clarity...! (yes the PROEL actually works Miracles!).

Neither of these were expensive pedals but really do deliver in bucket-loads...

Doc Sarvis
Contributing Member

USA/Salt Lake City

Tuned Strings and Tight Lines
Apr 29th, 2012 11:13 AM   Edit   Profile   Print Topic   Search Topic

I will add that mine is a highly modded DRRI with tag board conversion. After the Celestion Gold went in, the amp sounded better but still didn't match my '65. An upgrade to Mercury Magnetics OT and Choke brought it equal to or even a little better than my '65.

FDP Forum / Fender Amps: 1985 - Current / FENDER DRRI Questions

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