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FDP Forum / Amp Mods, Repairs, and Projects / Vibrolux Rev speaker resistance?

guitar_girl

US

Aug 19th, 2017 09:46 PM   Edit   Profile   Print Topic   Search Topic

Hi,

Newb question here. I'm thinking about replacing the original special design speakers in my 67. They were bad at the time I purchased it and I had them reconed, but I've never been thrilled with the low end. It seems pretty flabby. I'm hoping I might be able to get tighter, punchier bass out of it with a new set of Webers. A speaker comparison video I watched makes me think I might get there with either a 10A150 and a 10F125 or a 10F150 and a 10A125. Does this sound like a reasonable choice?

I'm also unclear what the Ohms to order. Most articles I've read say the output transformer is 4 Ohms. But I read in various threads that the speakers are 16. Wouldn't they need to be 8 ohms in parallel?

Thanks!

JJuran
Contributing Member
******

Boston Area

Aug 19th, 2017 10:32 PM   Edit   Profile   Print Topic   Search Topic

Hi guitar_girl - Your Vibrolux is looking for nominal 4 ohms impedance at the output jack if it has the stock output transformer. So you can order a pair of 8-ohm speakers and wire them in parallel.

Not sure what articles you're reading or the context of them that claim Fender used 16 ohm speakers on a Vibrolux Reverb in 1967. Technically, you could use 16-ohm speakers in that amp, but I would advise against that if your o/t is stock. A higher impedance on that o/t only makes the o/t work harder and run hotter.

My Vibrolux Reverb is running a pair of Weber 10" ceramic speakers but damned if I can recall the model numbers. They're not the same model though. Both are "10F125 something or other" 25 watt ceramics but they differ at the cone so the last letter is different on each one. I've got alot of amps and this one is my favorite. The low end is great and the overall tonal response is glorious. I love that amp.

In fact, I believe that when I put those speakers in the amp some years ago, I did so on a recommendation I found here on the forum. I'll see if I can find the thread where I found the recommendation - glad I did.

JJuran
Contributing Member
******

Boston Area

Aug 19th, 2017 11:00 PM   Edit   Profile   Print Topic   Search Topic

I just checked. My VR actually has a pair of 50-watt ceramics - 1 10F150 and 1 10F150T. Both are 8-ohm speakers.

Roly
Contributing Member
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Whitehorse Canada

I don't get out much
Aug 20th, 2017 12:13 AM   Edit   Profile   Print Topic   Search Topic

Has your amp been serviced recently?
If not the speakers may not be the problem.

cheers

guitar_girl

US

Aug 20th, 2017 07:02 AM   Edit   Profile   Print Topic   Search Topic

Thanks everyone, I'll order the 8 ohms ones. I hadn't read this in articles but rather in posts on various forums, obviously erroneous.

This amp was fully gone through 3 years ago, and received new power caps, and I think a couple of the caps inside the chassis. The speakers were coned but I'm not sure who by, someplace in Dallas I think. The tech sent them off for me. The only other thing I think it could be if not the speakers would be the output transformer. It unfortunately came to me without the original one. I did a search on the part number at one point and it wasn't a name brand. It looked like a cheap Chinese brand. Should I first try putting something like a Mercury in there and see what that does?

It may be that I'm just expecting too much punch from 10" speakers. It's not like there's no bass, but it just seems loose.

Roger Ball
Contributing Member
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Canada

New guitars, old amps. Perfect.
Aug 21st, 2017 01:53 PM   Edit   Profile   Print Topic   Search Topic

I installed a pair of Weber 10F150T speakers in my 1970 Vibrolux Reverb shortly after I bought it in 2004. They were the 25W version with light doping and they sound great.

If you think the output transformer is dodgy I suggest you check Allen Amplification, specifically the TO35MT model. These are top quality transformers and not that expensive.

Click here

Peegoo
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The rain sounds like

a round of applause
Aug 21st, 2017 03:38 PM   Edit   Profile   Print Topic   Search Topic

Welcome to the forum.

I installed the 10F150 in my Princeton Reverb based on a conversation I had with Mr. Ted Weber (RIP). I stated I wanted plenty of bottom end and he said the 50 had more low-end punch than the 25. I am completely happy with the tone from the amp.

guitar_girl

US

Aug 24th, 2017 03:39 PM   Edit   Profile   Print Topic   Search Topic

Thanks for the link Roger. I like Dave Allen's stuff. I bough a vintage 64 DR that he restored years ago and it still sounds great. That does seem like a bargain compared to the Mercury part. So when it says this does it mean its multi tap?

"4,000 ohm primary to 4/8 ohm secondary."

I'm thinking it would be nice if I had the option of running a 12" closed back cab like the Mesa as an external and they're generally 8ohm whilst the on board pair is 4 ohm I'm still struggling to wrap my head around impedance matching stuff


Hammond101
Contributing Member
**********

So. Cal. USA

Aug 24th, 2017 04:51 PM   Edit   Profile   Print Topic   Search Topic

Yes, the 4/8 means multi-tap. There are a couple of way to wire that. One output on the amp could be on the 4 ohm tap and the other the 8 ohm. switching jacks recommended. I like to use an unused ground switch in the stock position to switch taps. For the 8 ohm tap you would need to unplug the 2-10 speakers and plug in you single 8 ohm 12 cab.

Peegoo
Contributing Member
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******

Activity does not

always equal achievement
Aug 24th, 2017 04:59 PM   Edit   Profile   Print Topic   Search Topic

Yes, it offers a choice between 4-Ohm and 8-Ohm speaker impedances. Depending on what you want to do, you can install two speaker jacks and use one or the other:

- The 4-Ohm jack for the on-board speaker pair, or

- The 8-Ohm jack for the closed-back 1x12 cab

The good news is, your amp will be able to withstand a 100% impedance mismatch up or down (half...or double...what the OT wants to see). You won't damage the OT so long as you're not running the amp flat-out for long periods of time.

slider313

NC

Aug 24th, 2017 05:05 PM   Edit   Profile   Print Topic   Search Topic

I had two blackface Bandmasters come in with bad output transformers in the past. I used the Classic Tone replacement with great results. We compared both heads to an original and couldn't tell the difference. The Vibrolux Reverb uses the same 125A6A part. As for speakers, I have a pair of Celestion Alnico Gold 10's in my '64 and finally don't feel the need to try anything else!

http://www.classictone.net/Fender-Style-Transformers.html

(This message was last edited by slider313 at 07:18 PM, Aug 24th, 2017)

Peegoo
Contributing Member
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Activity does not

always equal achievement
Aug 24th, 2017 07:38 PM   Edit   Profile   Print Topic   Search Topic

Slider,

links are easy.

FDP Forum / Amp Mods, Repairs, and Projects / Vibrolux Rev speaker resistance?




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