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Posted: Fri Sep 24, 2010 8:03 pm
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I'm a huge gunny fan BTW :D
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Posted: Fri Sep 24, 2010 9:40 pm
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Hey Jimbo, which Rocket are we talking about(tube or solid state rectifier) ? I'm having a problem with the Rocket 2 designation. Are we looking at a R-12-R model ? The 3-prong power cable hook-up is straight forward, but I can't see the ground switch in the older amp. The B-12-Nf and B-15-Nf models, have the polarity switch. Either way, the power caps will have to be drained before any work can be done. A jumper cable with a 470ohm 1watt resistor in line will do the trick. If you and your teach know what I'm talking about, then the job can be done by you two. There are only a couple of particulars in the wiring that are necessary and of course some soldering skill. This stuff isn't too tough, but some care and patienence is mandatory. Art

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Posted: Sat Sep 25, 2010 9:07 am
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One other note: old Ampeg combos usually have an 0.05 mfd/1000 VDC cap from hot side of primary to ground. If this cap fails, you can have AC on the chassis (which is what I bet is happening with your amp). When you wire up the new three prong line, remove this cap and bypass any "ground" switch, if it exists. Be sure that the hot lead of the new three-prong wire is connected to the fuse.

Ampeg schemo:

http://www.schematicheaven.com/ampegamp ... ocket2.pdf

Three prong conversion:

http://www.unclespot.com/3prongconversion.JPG


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Posted: Sat Sep 25, 2010 9:16 am
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BMW2002Ti wrote:
One other note: old Ampeg combos usually have an 0.05 mfd/1000 VDC cap from hot side of primary to ground. If this cap fails, you can have AC on the chassis (which is what I bet is happening with your amp). When you wire up the new three prong line, remove this cap and bypass any "ground" switch, if it exists. Be sure that the hot lead of the new three-prong wire is connected to the fuse.


I bought a '66 Ampeg Gemini II "on spec" a couple of years ago that had that same arrangement on the power cord. It would always give my fingers a "tingle" when I touched the front panel polarity switch.

Arjay

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Posted: Sat Sep 25, 2010 12:41 pm
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Posted: Sat Sep 25, 2010 1:24 pm
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Quote:
Hey Jimbo, which Rocket are we talking about(tube or solid state rectifier) ? I'm having a problem with the Rocket 2 designation. Are we looking at a R-12-R model ? The 3-prong power cable hook-up is straight forward, but I can't see the ground switch in the older amp. The B-12-Nf and B-15-Nf models, have the polarity switch. Either way, the power caps will have to be drained before any work can be done. A jumper cable with a 470ohm 1watt resistor in line will do the trick. If you and your teach know what I'm talking about, then the job can be done by you two. There are only a couple of particulars in the wiring that are necessary and of course some soldering skill. This stuff isn't too tough, but some care and patienence is mandatory. Art


Its the all- tube, rocket II/ GS-12R. I been trying to upload photos but stupid Windows vista doesn't recognize older memory cards on my pc (supposed to get it "upgraded") has a 12inch jensen speaker, 2 12AX7, 2 7591, and a 6U10 which I believe is for the reverb. A bright and normal channel, six knobs (vol., treb., bass, speed, intensity, dimension,) a polarity and power switch, and a "after_e_t" switch (which I have no clue what is is since letters are missing). Echo and vibrato channels.

And all this information is REALLY handy guys thanks for posting! Don't know what I would do without you guys... :)

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Posted: Sat Sep 25, 2010 1:32 pm
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Yeah BMW, those were the wiring particulars, I was referring to. Good post ! "A picture is worth a thousand words." Art

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Posted: Sat Sep 25, 2010 4:05 pm
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Whatever that "after_e_t" switch is, it must be something specific to that particular model -- there wasn't anything like it on my Gemini II......

Image

I think Ampeg called the reverb on their amps "echolette" or some such.

For more info on all things Ampeg and to order NOS and repro parts, go here......

http://www.fliptops.net/index.htm

HTH

Arjay

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Posted: Sat Sep 25, 2010 4:06 pm
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Retroverbial wrote:
Whatever that "after_e_t" switch is, it must be something specific to that particular model -- there wasn't anything like it on my Gemini II......

Image

It did have accordion inputs though.

:mrgreen:

I think Ampeg called the reverb on their amps "echoverb" or some such.

For more info on all things Ampeg and to order NOS and repro parts, go here......

http://www.fliptops.net/index.htm

HTH

Arjay

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Posted: Sat Sep 25, 2010 10:17 pm
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Jimbo that is some amp ! The switch looks to be an additional tremelo intensity control, grounding out a portion of the oscillaton on the input signal. Yeah, that 6U10 serves a multi task in the reverb circuit, very similar to the 6C10 used in the Fender amps(ca. '75-'80). Art

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Posted: Wed Sep 29, 2010 2:08 pm
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BMW2002Ti wrote:
One other note: old Ampeg combos usually have an 0.05 mfd/1000 VDC cap from hot side of primary to ground. If this cap fails, you can have AC on the chassis (which is what I bet is happening with your amp). When you wire up the new three prong line, remove this cap and bypass any "ground" switch, if it exists. Be sure that the hot lead of the new three-prong wire is connected to the fuse.

Ampeg schemo:

http://www.schematicheaven.com/ampegamp ... ocket2.pdf

Three prong conversion:

http://www.unclespot.com/3prongconversion.JPG


this "great" feature was also shared on Hilgen amps (spinoff of Ampeg employees, just up the road in Linden, NJ). I had a Basso Grande that did the same to me. Now I know better and would have that amp into a tech faster than you could say "fatal electrocution."

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Posted: Sun Oct 31, 2010 4:21 pm
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Finally got a pic! Sorry about the wait guys

Its been sounding great lately. However, Distortions sound a little on the bright side, but the clean is spectacular. I got to find a good pedal, I'm thinking about a more vintage style distortion like a big muff would best suit it.

I drove to one of the only electronic repair stores the other day, and it was closed. My teach knows someone who can put a three prong in...

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Posted: Sun Oct 31, 2010 4:23 pm
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sorry about the pic size...
Don't judge, She's a dirty girl... (someone told me armorall works good on totlex), possibly a new grille cloth and a good shining to the logo

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Posted: Sun Oct 31, 2010 5:40 pm
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Nice amp, Jimbo ! Hope you get that 3-prong cable and have many years of enjoyment out of that baby ! Art

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