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Post subject: 65 DRRI: thinking of replacing speaker with 2 10's
Posted: Sun Oct 31, 2010 11:07 am
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As the subject stated, I'm thinking of replacing the stock speaker in my 65 DRRI with a pair of jensen 10's. I'm concerned about getting the right ohm rated pair. Should I get a pair of 16 ohm speakers to match the 8 ohm output? I obviously need some advice in this regards. Thanks!

In regards to installation, I think I know how to do this, but if there's anything "tricky" about doing the installation that a novice should know, please do share.

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Posted: Sun Oct 31, 2010 11:36 am
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Correct.

For traditional parallel wiring, you'll need a pair of 16Ω speakers. I've built two of these conversions for clients -- it's pretty straight-forward with no surprises. If you anticipate using Celestion speakers, install only four screws per speaker.

Best of luck, HTH

Arjay

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Posted: Sun Oct 31, 2010 4:42 pm
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Retroverbial wrote:
I've built two of these conversions for clients -- it's pretty straight-forward with no surprises.


Arjay:

Did this reduce the "boominess" of the bass? I want the thing to sound a bit more like a Princeton/Vibrolux, maybe even break-up a little earlier via the use of low wattage speakers, ie., 2 25 watt speakers. Will a speaker switch accomplish any/some of the above.

I do appreciate your time and help.

SD

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Posted: Sun Oct 31, 2010 7:15 pm
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The amp will be perceived to be louder per given setting of the volume and tone controls merely on the basis of more radiating cone area -- 157 square inches (2 x 10) vs 113 square inches (1 x 12) -- and two voice coils, rather than one. The tone will be somewhat punchier through the mids, with some extension of the highs and slightly diminished bass response......IOW, trending towards your Princeton/Vibrolux benchmark.

To alter the amp's breakup profile will require some rearrangement of the tubes. Try swapping your V2 (12AX7) with your V6 (12AT7) and see if the amp starts to "grit" earlier, using the vibrato channel.

HTH

Arjay

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Posted: Mon Nov 01, 2010 3:29 am
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Why you don't just put a much better 12 inches speaker ? But I don't know if the original 12 inches is realy good.

For what of you are looking for , earlier breakup, yes, working on 12AT7 and power tube bias are first thing to do.


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Posted: Fri Nov 05, 2010 10:27 pm
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Hi SD, I think the Weber vintage series 10A 125-0 speakers would be my choice. The pre amp tube swap is a good idea, but I'd try a NOS 5751 in the V6 postion. I don't think much more gain on the 6V6's is necessary. A nice smooth RCA 7025 in the V2 slot might be the way to go, if you can swing the coin. Art

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Posted: Sat Nov 06, 2010 1:27 am
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aclempoppi wrote:
A nice smooth RCA 7025 in the V2 slot might be the way to go, if you can swing the coin. Art


A vintage 7025 in the V2 socket is contra-indicated, Art. It has an indentical mu measurement to a standard 12AX7 (both of them rated at 100) and the 7025's improved noise floor will make no difference in a DRRI since the "modernized" chassis is designed and optimized for 12AX7s (search the amp section of "The Fender Forum" for my full report on this very topic).

HTH

Arjay

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Posted: Sat Nov 06, 2010 3:17 pm
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Like I said Arjay, a tube swap is a good idea. If SD likes it , then there you go. It's just not the route I would go. The Webers should provide the early break-up and the 5751 a bit more push on the 6V6's. At that point I wouldn't change the pre amp gain, just make sure the first tube the guitar signal sees is a solid quiet tube. Art

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Posted: Sat Nov 06, 2010 5:02 pm
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aclempoppi wrote:
just make sure the first tube the guitar signal sees is a solid quiet tube. Art


Agreed.

But what my testing revealed was, the re-issue blackfaces do not idle any more quietly with a quality 12AX7 than they do with an NOS mil-spec 7025 in the V1 and V2 positions. The difference is audible in a vintage blackface or silverface though.

HTH

Arjay

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Posted: Sat Nov 06, 2010 9:17 pm
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I see what you're saying, Arjay. Then the reissues are quiet or noisy ? Didn't have a chance to look up your report. What was the title and approximate date ? Art

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Posted: Sun Nov 07, 2010 12:24 am
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Here's the link to my original post, Art......

http://www.thefenderforum.com/forum/sho ... =Shoot-out

HTH

Arjay

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Posted: Sun Nov 07, 2010 10:24 pm
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Good job Arjay ! And that's good news for the reissue owners ! Art

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Posted: Sun Nov 07, 2010 11:03 pm
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Indeed, I was somewhat surprised by my test results.

The whole issue began when I contemplated doing a complete re-tube on my Spankmaster Reverb. I only have a limited number of NOS 7025's and I thought "gee, mebbe it doesn't really need this tube for a decent S/N ratio". And it turned out my hunch was correct. Thus, I now save all my 7025's for the vintage amps that can actually benefit from them. Both of my re-issues (DRRI, TRRI) currently have NOS Amperex 12AX7s installed. I have plenty of those on hand.

Arjay

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Posted: Mon Nov 08, 2010 9:30 pm
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I would suggest try spending some time playing through the 2nd lower powered input of your reverb channel. I think you'll find the boominess you referred to is reduced and you can also get a driven sound at a lower volume level. You might like the difference. Have fun :wink:


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Posted: Mon Nov 08, 2010 10:04 pm
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That's some good advice, Ota. I tend to miss the simple and obvious alternatives. Thanks and Welcome to the forum ! Art

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