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Posted: Thu Apr 29, 2010 6:15 am
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Here's a nice documentation from GGJaguar's website concerning the Bronco student amplifier of 1967. The pictured baby is not mine, click on the source link for more details:

http://www.ggjaguar.com/broncamp.htm

Image

The Bronco is essentially a Vibro Champ with red labels on the face plate instead of light blue and a different name.

BTW, I've noticed that not all Broncos were sold with the tailless decals. Although the Bronco is the very first silverface amp to be shipped with the tailless Fender amp decal, some Broncos still used the tailed amp decal of the time, as pictured on this fine 1968 example below (this amp is not mine)
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source: http://www.rocknrollvintage.com


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Posted: Thu Apr 29, 2010 2:17 pm
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Yet another thread uselessly hijacked by your obsessive-compulsive interest in pursuing the tail-vs-tailess amp logo debate. Most folks regard such behavior as anal-retentive. The last thing I think about when weighing the merits or lack thereof between SF and BF Fender amps is the type of logo screwed to the baffle. In fact they are as significant to me as the size, shape, color, and consistency of my turds. Responses that fail to address the original poster's question are a worthless waste of bandwidth.

Arjay


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Posted: Sat May 01, 2010 1:34 am
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I find the Bronco amps to be an interesting marketing ploy. Can't think of another amp that falls into this category. Another great SF amp!!! Art

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Posted: Tue May 04, 2010 4:19 pm
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aclempoppi wrote:
I find the Bronco amps to be an interesting marketing ploy. Can't think of another amp that falls into this category. Another great SF amp!!! Art


Fender FM series and Frontman. They're the same amps just with a difference grillcloth. I have no clue why they do this.

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Posted: Tue May 04, 2010 4:20 pm
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Retroverbial wrote:
Yet another thread uselessly hijacked by your obsessive-compulsive interest in pursuing the tail-vs-tailess amp logo debate. Most folks regard such behavior as anal-retentive. The last thing I think about when weighing the merits or lack thereof between SF and BF Fender amps is the type of logo screwed to the baffle. In fact they are as significant to me as the size, shape, color, and consistency of my turds. Responses that fail to address the original poster's question are a worthless waste of bandwidth.

Arjay


I seriously laughed at this. Nicely done, sir. You sum up what needs to be said on soooo many forums.

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Posted: Fri May 07, 2010 9:28 pm
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FYI, In my first edition of The Tube Amp Book Aspen Pittman says that some Fender amps like the Deluxe Reverb were never altered in any way except cosmetically, after CBS bought Fender. [/u][/b]


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Posted: Sat May 08, 2010 1:11 am
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Not precisely true. In the early '70s the DR (like most of the other models in the Fender line) received a polarized-and-grounded 3-conductor power cable and a compatible AC convenience outlet. However the essense of the signal chain through the circuit board was left relatively unmolested, at least until around 1977 when the pull-boost volume control was added. Despite that however, the DR remained as one of Leo's few designs that did not suffer the ignominious fate of "annual improvements" at the hands of CBS's butchers. The Princetons and Champs likewise were pretty much left alone as well.

Arjay


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Posted: Sat May 08, 2010 7:25 am
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Retroverbial wrote:
Not precisely true. In the early '70s the DR (like most of the other models in the Fender line) received a polarized-and-grounded 3-conductor power cable and a compatible AC convenience outlet. However the essense of the signal chain through the circuit board was left relatively unmolested, at least until around 1977 when the pull-boost volume control was added. Despite that however, the DR remained as one of Leo's few designs that did not suffer the ignominious fate of "annual improvements" at the hands of CBS's butchers. The Princetons and Champs likewise were pretty much left alone as well.

Arjay


My 1966 Deluxe Reverb had the ground switch and AC outlet. It was marked CBS but I'm betting it was made with pre-CBS parts. My '67 Suoer Reverb and '70 Twin also had those features. I really miss the AC outlet and wish it had been included on the reissues.


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Posted: Sat May 08, 2010 7:55 am
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That "ground switch" on the older Fender amps is no ground switch despite what it says above it on the panel. It is a POLARITY switch and it has killed and injured a lotta people who labored under that misconception.

The AC convenience outlet was not included on any of the re-issues because, according to some Fender engineers I spoke with in Scottsdale back in 2001, they were "afraid that somebody would plug an electric skillet or a hair dryer into the back of the amp".

Arjay


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Posted: Sat May 08, 2010 8:31 am
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Yeah Arjay. The polarity switch was really dangerous as anyone whose been bit in the lip by 110 volts from a PA system that wasn't the same polarity can attest. :shock:

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Posted: Sat May 08, 2010 9:30 am
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Indeed. It happened to Keef when the Stones played the Sacramento Municipal Auditorium back in '66.

I was there. And it wasn't pretty......

Arjay


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Posted: Sat May 08, 2010 6:26 pm
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I love my silver face 72 twin!
retube it every 2 years
and it plays like a million bucks!


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Posted: Sat May 08, 2010 10:24 pm
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Yeah, those silverface guys are great ! My '68 Bassman is undergoing it's fourth pre amp reconfiguration. cleared the board off last month. Still not sure which designs I'll implement. Maybe a pseudo tweed channel with a cathode follower and a basic Pro channel. Athough I'm thinking about trying an acoustic/electric dedicated channel. That would certainly be unknown territory for me. These amps are great platforms for experimentation. The power amp section is nice and stable, with adjustable bias, '63 Bassman clone MM PT and MM OT. So for now, I'll leave that section alone. But that pentode- triode switch has been burning a hole in the drawer.....uhmmmm. Art

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Posted: Sat May 08, 2010 10:36 pm
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aclempoppi wrote:
Maybe a pseudo tweed channel with a cathode follower and a basic Pro channel.


OH YEAH! (wildly pumping fist)

Wire it up to some vintage alnicos, then build yourself one of these......

https://taweber.powweb.com/store/kits_weber.htm#5H15

Whaddya got? Instant '63 Vibroverb.

Go for it, Art!

Arjay


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Posted: Sun May 09, 2010 6:51 am
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I don't think polarity ( ground switch) is dangerous if you replace your 2 prong AC wire for a 3 prong ( with ground).

It is the 2 prong wire make it dangerous.

You should never use an amp without a ground plug


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