bruno cowtipper schematic

[martin manning]

Sounds good to me!

Here's the tweedy pie.

Pretty much a stright-up '59 Bassman. The only significant change I see is the 25k presence pot- big increase in negative feedback and the shift of the presence break point to lower frequencies (since the presence cap is original value), and the larger PI tail resistance it brings.

[Roe]

any source for pacific transformers online?

[FUCHSAUDIO]

and what kind/brand of pots?

I recently serviced a Bruno Cowtipper 100 for a locally based national jam band. Typical Bruno construction, lots of hot melt glue and general pretty haphazard layout. This one was built between two rows of terminal strips. Many component leads extended with wire (resistors mostly), caps were new Orange Drops.

The interesting thing (despite the construction) is most Bruno's have pots and parts from various sources: Alpha (Mouser), CTS (old looking, possibly surplus), and sometimes a resistor is used to alter the taper or value. Sometimes solid shafts, sometimes split shafts, sometimes metal, sometimes plastic. Seems like surplus to me. This is also found in Plush and some of the older lower grade amps made years ago.

The circuits usually appear to be basic Fenders with a few tweaks, somewhat better (in most cases) iron. This one had very high grid resistors on the power tubes (47-K ?), but had 47 ohm 2-W screen resistors on 6L6's !

Transformers are usually Pacific, although this particular amp had two transformers with no branding or part numbers on them. In the case of reverb, it's usually a 3-knob Fender reverb wired on the input of the amp like if you plugged in an outboard Fender reverb between your guitar and amp.

I've heard some sound very good, many that sounded just ok. I don't "get" Bruno, nor the stink made about them, but it's one man's opinion. I think if you're making PTP and selling for that kind of price, it should be executed better. Because of the rareness of the model (apparently very few of this type were made), I was asked to not shoot pics.

[PaisleyTube]

what I did notice in the Tweedy Pie schematic:

6G6B style neg. feedback/presence (as most 5F6As did have)
6k8 tail-r (see above)

filtering: caps in series (just try it!)

[PaisleyTube]

Thanks Andy

[tag101]

and what kind/brand of pots?

I recently serviced a Bruno Cowtipper 100 for a locally based national jam band. Typical Bruno construction, lots of hot melt glue and general pretty haphazard layout. This one was built between two rows of terminal strips. Many component leads extended with wire (resistors mostly), caps were new Orange Drops.

The interesting thing (despite the construction) is most Bruno's have pots and parts from various sources: Alpha (Mouser), CTS (old looking, possibly surplus), and sometimes a resistor is used to alter the taper or value. Sometimes solid shafts, sometimes split shafts, sometimes metal, sometimes plastic. Seems like surplus to me. This is also found in Plush and some of the older lower grade amps made years ago.

The circuits usually appear to be basic Fenders with a few tweaks, somewhat better (in most cases) iron. This one had very high grid resistors on the power tubes (47-K ?), but had 47 ohm 2-W screen resistors on 6L6's !

Transformers are usually Pacific, although this particular amp had two transformers with no branding or part numbers on them. In the case of reverb, it's usually a 3-knob Fender reverb wired on the input of the amp like if you plugged in an outboard Fender reverb between your guitar and amp.

I've heard some sound very good, many that sounded just ok. I don't "get" Bruno, nor the stink made about them, but it's one man's opinion. I think if you're making PTP and selling for that kind of price, it should be executed better. Because of the rareness of the model (apparently very few of this type were made), I was asked to not shoot pics.

Hey Andy,
I hope all is well!

Those are VERY rare! Of all the Bruno models I have played, (I think most of them) I have never even SEEN a Cowtipper 90 or 100, even during all the trips to Ultra I have made.

[rhinson]

any source for pacific transformers online?

they have a website, with contact info, but they won't sell you bruno's numbers. rh

[tag101]

LOL. If this is not a joke I will be severely disappointed. The amp is a Super Reverb with trivial mods... That'll be $3k, please.

If the amp is a Super reverb with trivial mods, what does the additional preamp tube do? I spent the last several days going all over the place in the City and NJ playing vintage SRs, RI SRs, all kinds of vintage Fenders, and went to Ultrasound and played everything I could find. Now I am going to have buy another Cowtipper which I cant afford. They kill everything tonally. Why did I have to stumble on this damn thread.

[Reeltarded]

An added tube IS a trivial mod. OMG stop it. lol

Don't make me build a Fender. I could easily build one that good and that ugly, and I probably have everything except transformers somewhere at GZ51, the top secret govt facility where dead amps go before the Devil has his way.

I just got a great idea though.. thanks!

[Gaz]

LOL. If this is not a joke I will be severely disappointed. The amp is a Super Reverb with trivial mods... That'll be $3k, please.

If the amp is a Super reverb with trivial mods, what does the additional preamp tube do? I spent the last several days going all over the place in the City and NJ playing vintage SRs, RI SRs, all kinds of vintage Fenders, and went to Ultrasound and played everything I could find. Now I am going to have buy another Cowtipper which I cant afford. They kill everything tonally. Why did I have to stumble on this damn thread.

tag101, I'm not sure if you are able to read schematics, but there is no "extra tube" in the schematic posted by the OP, it is just the reverb channel of a Fender.

[Reeltarded]

Hey, still.that makes the reverb sound better.

Brilliant!

[tag101]

LOL. If this is not a joke I will be severely disappointed. The amp is a Super Reverb with trivial mods... That'll be $3k, please.

If the amp is a Super reverb with trivial mods, what does the additional preamp tube do? I spent the last several days going all over the place in the City and NJ playing vintage SRs, RI SRs, all kinds of vintage Fenders, and went to Ultrasound and played everything I could find. Now I am going to have buy another Cowtipper which I cant afford. They kill everything tonally. Why did I have to stumble on this damn thread.

tag101, I'm not sure if you are able to read schematics, but there is no "extra tube" in the schematic posted by the OP, it is just the reverb channel of a Fender.

Ah. The schematic does not come up for me for some reason. The later Cowtippers all have an additional 12ax7. The schematic must have been from a very early one. Maybe they were clones like my reverb unit?

[tag101]

An added tube IS a trivial mod. OMG stop it. lol

Don't make me build a Fender. I could easily build one that good and that ugly, and I probably have everything except transformers somewhere at GZ51, the top secret govt facility where dead amps go before the Devil has his way.

I just got a great idea though.. thanks!

Lets hear it then! I am looking forward to it.

And my question remains, what does the additional tube do? (In the more recent Cowtippers) Anyone know?

[Gaz]

If the amp is a Super reverb with trivial mods, what does the additional preamp tube do? I spent the last several days going all over the place in the City and NJ playing vintage SRs, RI SRs, all kinds of vintage Fenders, and went to Ultrasound and played everything I could find. Now I am going to have buy another Cowtipper which I cant afford. They kill everything tonally. Why did I have to stumble on this damn thread.

tag101, I'm not sure if you are able to read schematics, but there is no "extra tube" in the schematic posted by the OP, it is just the reverb channel of a Fender.

Ah. The schematic does not come up for me for some reason. The later Cowtippers all have an additional 12ax7. The schematic must have been from a very early one. Maybe they were clones like my reverb unit?

The schem on the first page shows two 12AX7s and two AT7s. Are you saying the ones you played had 5 preamps tubes? Not sure how he could utilize a whole 'nother tube without adding a bunch of gain. He could be driving the power tubes with cathode followers like an SVT, but I think that 'd take away from the the BF mojo.

[tag101]

tag101, I'm not sure if you are able to read schematics, but there is no "extra tube" in the schematic posted by the OP, it is just the reverb channel of a Fender.

Ah. The schematic does not come up for me for some reason. The later Cowtippers all have an additional 12ax7. The schematic must have been from a very early one. Maybe they were clones like my reverb unit?

The schem on the first page shows two 12AX7s and two AT7s. Are you saying the ones you played had 5 preamps tubes? Not sure how he could utilize a whole 'nother tube without adding a bunch of gain. He could be driving the power tubes with cathode followers like an SVT, but I think that 'd take away from the the BF mojo.

Yes, the newer Cowtippers (My last one included) had the fifth preamp tube. It sounded even better than the earlier ones. Still total fender, but more chime on top, a tighter lower end, smoothe rtreble and monsterous reverb.

A quote from someone on TGP: " the pro II has an added tube in the pre-amp as well as a bright switch but I have an older CT45 which has neither the extra tube nor the brite switch but does sound mighty fine"


Here is a picture of my Cowtipper 35. count the tubes. 5 preamp. My old one had 4. (Remember, no trem on the amp)


http://pic50.picturetrail.com/VOL438/64 ... 811790.jpg