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FDP Forum / Miscellaneous and Non-Fender Topics / Using Super Reverb to power PA in a pinch

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caseycash

Richmond, VA

Surf/Instro
Jun 30th, 2017 03:44 AM   Edit   Profile   Print Topic   Search Topic

I usually play outdoor venues with two 1967 Super Reverbs. We use a Fender Passport 250 Deluxe(with the Bose speakers) as a PA. Can anyone tell me if I could safely use one of the Supers as a power amp for the pair of PA speakers in an emergency?

Passport 250

RDR
Contributing Member
********

I tried to think

but nothing happened!
Jun 30th, 2017 09:05 AM   Edit   Profile   Print Topic   Search Topic

What's the impedance of each speaker cab?

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

So. Cal. USA

Jun 30th, 2017 09:32 AM   Edit   Profile   Print Topic   Search Topic

We did this stuff all the time in the early 70s. Never broke anything. We were most likely more lucky than good at it. You have to remember that the Super is only a 40 watt amp. You PA will be severely compromised power wise.

Assuming the speakers are 8 ohm units two of them will yield a 4 ohm load and the SR wants to see 2 ohms. Fender amps have no issue with a 100% mis-match so yes it will work short term but when pushed expect some output transformer heat.

If you are planning to do this as a "just in case" I think I'd invest in an inexpensive power amp and carry it as a spare. A vintage Super Reverb really shouldn't endure this.

zenland

U.S.A. Hotlanta

avise la fin
Jun 30th, 2017 02:33 PM   Edit   Profile   Print Topic   Search Topic

I'm with Hammond 101-"invest in an inexpensive power amp and carry it as a spare"!

I have a '68 Super Reverb and I sure wouldn't want to go there!!!

Tony Wright
Contributing Member
****

Stillwater, OK

I never met a calorie I didn't like.
Jun 30th, 2017 07:45 PM   Edit   Profile   Print Topic   Search Topic

Hammond101 is correct about the 2 Ohm rating of the Super Reverb.

I would note that you can go to FDP sponsor Musician's Friend and pick up one of several powered mixers with four channels and 100-150 Watts at 4 Ohms which should support two Bose/Fender Passport 8 Ohm speaker cabinets.

That is under powering the speaker cabinets, but that is reasonably safe. If you wanted to match the power amp output of the Fender, you need a powered mixer that develops 125 Watts at 8 Ohms per amp channel.

It appears that the Peavey PVi4B and the Peavey PV5300 as well as the Phonic Powerpod 620 would all be $200 or less and all would have adequate power for two Bose/Passport 250 Deluxe speakers.

You can look up the power specifications yourself to see if there is another brand and model powered mixer to replace the Passport if it has allowed the magic smoke to escape.

reverendrob
FDP Data Goon
Moderator

We all want

our time in hell
Jun 30th, 2017 11:05 PM   Edit   Profile   Print Topic   Search Topic

At that point, don't bother with the PA speakers.

Just use the Super itself if that's what you're going to run things through.

It won't sound hot pretty much no matter what you do.



caseycash

Richmond, VA

Surf/Instro
Jul 1st, 2017 02:33 AM   Edit   Profile   Print Topic   Search Topic

1st, thanks for all of the helpful responses! I haven't been able to determine the impedance of the Passport cabinets. So far the Passport has never had a problem just trying to think ahead.

Tony Wright
Contributing Member
****

Stillwater, OK

I never met a calorie I didn't like.
Jul 1st, 2017 01:33 PM   Edit   Profile   Print Topic   Search Topic

If you look at the back of your Passport 250 (I did a web search for a photo and via Yahoo Images and found the photo below.

The amp is appears to be "stereo" as there is a LEFT MAIN and a RIGHT MAIN output and each is labeled 125 Watts at 8 Ohms.

Therefore, if you find a MONO amp that puts out "around" 200-250 Watts at 4 Ohms or a STEREO amp that puts out around 100-150 Watts PER CHANNEL at 8 Ohms, you "should" be good to go.

One of those small powered mixers I mentioned before are good for solutions in all sorts of "crisis" situations. Bass amp head quits. Guitar amp goes on the fritz but speaker still OK...

Good to plan ahead.

Fender Passport Deluxe 250 rear view photo

ejm

usa

Jul 1st, 2017 02:48 PM   Edit   Profile   Print Topic   Search Topic

Some have eluded to it, but no one has come right out and asked: Why would you want to do this?

And, it's probably going to sound, um, less than perfect. Plus, if you do it and something goes wrong, for the cost of repairing a Super Reverb (there is a complete Passport system on my local CL for $235 and another one for $250), I'll ask again: Why would you want to do this?


caseycash

Richmond, VA

Surf/Instro
Jul 1st, 2017 11:16 PM   Edit   Profile   Print Topic   Search Topic

ejm - when I play an outdoor venue I usually bring two super reverbs, two guitars, and the Fender Passport 250 deluxe, along with the speaker stands and mic stands. Trying to determine if it would be feasible to use one of the supers to power the Passport speakers in the event that the PA amp malfunctioned on a job. Hasn't happened yet but it could, and I would prefer not to have to carry any more equipment around.

reverendrob
FDP Data Goon
Moderator

We all want

our time in hell
Jul 2nd, 2017 12:39 AM   Edit   Profile   Print Topic   Search Topic

It's not a feasible thing, but as people have mentioned, an extra power amp isn't going to be big nor expensive.

caseycash

Richmond, VA

Surf/Instro
Jul 2nd, 2017 02:28 AM   Edit   Profile   Print Topic   Search Topic

And thanks for everyone's comments.


Dolemite

What It Was!

Fairly Unbalanced
Jul 6th, 2017 11:47 AM   Edit   Profile   Print Topic   Search Topic

We used to run /everything/ thru one Silvertone 2x12 amp. Guitar, bass & hi impedance mic.

This is why everyone knows that an Accordian input is critical to any superior amp design.

willie
Contributing Member
********

Too Near Atlanta GA

Amp Tech Emeritus
Jul 6th, 2017 02:22 PM   Edit   Profile   Print Topic   Search Topic

I remember doing that very thing back in the very early 60's...essence of what a real garage band was. :)

w

Tony Wright
Contributing Member
****

Stillwater, OK

I never met a calorie I didn't like.
Jul 6th, 2017 11:15 PM   Edit   Profile   Print Topic   Search Topic

Dolmite: I recall going down to Skaggs Rental on North Union in Ponca City in 65 to rent a PA system. It was a 50 Watt Bogen with two home made wood cabinets each with a single 12 inch speaker...and a green bullet Shure mic and stand for vocals. Speaker wires had bare tail copper stranded "electric lamp cord" wires. The mic cable had a screw on connector to the mic with a large blob of solder in the center for electric contact.

Total cost $5.00 for 24 hours.

I rented that probably 5 or 6 times before we had enough gear that had a second channel for the vocal mics. That is when two of us were able to talk our parents into a Silvertone 1484 Twin Twelve. Reverb channel was for guitar.

Why? Because, after all, guitar is more important than vocals, right?

Mick Reid
Contributing Member
***

Australia

American-made in Oz!!
Jul 7th, 2017 01:45 AM   Edit   Profile   Print Topic   Search Topic

"I remember doing that very thing back in the very early 60's...essence of what a real garage band was."

Not the 60's, but I recall my early days in a very similar way.
In one "band" we had a SF Twin Reverb for vocals. It actually wasn't too bad!

Eventually "upgraded" to a Peavey PA-120 Mixer Amp. 4 channels, 120 watts - woo hoo!!!

(This message was last edited by Mick Reid at 05:13 AM, Jul 7th, 2017)

Dolemite

What It Was!

Fairly Unbalanced
Jul 7th, 2017 07:08 AM   Edit   Profile   Print Topic   Search Topic

"50 Watt Bogen"

K-I-L-L-E-R guitar head!!

Dolemite

What It Was!

Fairly Unbalanced
Jul 7th, 2017 07:09 AM   Edit   Profile   Print Topic   Search Topic

.. and so we go full circle back to the Super Reverb in the thread title.

= Pretzel Thread Logic

jazzguy

Philly, B-3 Capital

don't dream it be it
Jul 7th, 2017 07:25 AM   Edit   Profile   Print Topic   Search Topic

"In one "band" we had a SF Twin Reverb for vocals. It actually wasn't too bad!"

I bought a blackface Twin reverb from a drummer that bought it new for vocals


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

So. Cal. USA

Jul 7th, 2017 09:41 AM   Edit   Profile   Print Topic   Search Topic

Reading this again and with the design of a modern powered PA head, if the Passport power section failed you would most likely be out of business. The preamp section would most likely not function due to protection circuits activating or blown fuses that would of course blow again.

I'll change my vote to, "Back it up with a powered mixer". Something used in nice shape would be fairly inexpensive.

Next 20 Messages  

FDP Forum / Miscellaneous and Non-Fender Topics / Using Super Reverb to power PA in a pinch




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