Rocket Feedback

Express, Liverpool, Rocket, Dirty Little Monster, etc.

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sniffyduke
Posts: 90
Joined: Fri Sep 18, 2009 6:10 pm

Rocket Feedback

Post by sniffyduke »

Alright, I tried this strange approach to building this Rocket.

Here are my findings..

1) Ther is a little prob with initial power up in the last tube EL84
socket, but thats another story.

2) OK, this darn this sounded like crap at first. I did make some errors
when I first powered up. I forgot to ground the cliffjack's
(Only on the speakers though. I am used to using switchcraft
but I didn't have any laying around. Also I had my PI pin 2
and 3 backwards. even when I fixed the problems it was
still boomy and sounded bad.

3) I used all NOS old 1watt CC resistors and most values are a little off
well, more than a little.

4) I put that switch like the Ceriatone on there so you can switch
from 260v to 300v (Like an old AC30) Here is the kicker. I thought
I was running at 260V when doing my first voltage check, but I
was really at 300v. What it was is that the on/on switch
works backwards, and I did not know that. When I checked the Volts
my plates are about 4 t0 6 volts over the chart, and my cathode
is about 5 to 6 under. So It does not break up that much.
Example: some of my 100k CC resistors only read 92k
B+ volts are exact.


In Summary:

Its a sloppy build. I basically desinged as I built. I new I would
run into problems with signal wires, plus my B+ wires are running
right under the components, ther eis no board to shield.

I plugged an IPOD into it to burn it in.

WOW, it was a 180 from the first time. You guys HAVE to try
these Sozo Blue caps in this amp. But also YOU HAVE TO GIVE
THEM LOTS OF TIME. These have more sparkle than I thought they would have.

At 260V this thing sounds like a hot rodded Fender from the old days.
I don;t know how. But the cleans are great even though it will not
break up with a strat or telecaster unless its volume is maxed.

But, the coolest thing is when you run it at 300v and use a Les Paul.
I have never heard anything like it. Its like a lower volume less gainy
express with no fizz. You can hold one note forever....... at low gain
king of crunch. I am pushing the hell out of the el84's. May not last long
but its cool while it does.

This sounds like no other Rocket I have ever heard, even though its a mess.

NOW IF I COULD JUST GET RID OFF THE BUZZ THIS THING WOULD
BE A KEEPER LOL.

With humbuckers this thing buzzes bad when your volume on the
guitar is turned all the way up and the amp is past 11:00.

You have to try this. Just don't make a buzz machine like me : )

The Mistakes made a totally unique amp which I love.
But its not going to be visiting the studio with the Buzz.


PS. I have no idea why I used red felt LOL :D


Mike
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sniffyduke
Posts: 90
Joined: Fri Sep 18, 2009 6:10 pm

Re: Rocket Feedback

Post by sniffyduke »

Oh, I more pic of this messy amp : )

Someone should do it right with no buzz. You will have a cool amp

Funny, the buzz is not as bad at 300v.

Plus It got worse when I changed the wire from the two back
40uf caps that goes to the standby switch. It was a little
teflon wire and I changed it to a 20g

It buzzes even with a bud chassis cover, but only when the guitar volume
is up all the way. If you place your habd about 3 inched over the PI
section It buzzes worse. Esp if you bump the pin 7 grid on the PI
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sniffyduke
Posts: 90
Joined: Fri Sep 18, 2009 6:10 pm

Re: Rocket Feedback

Post by sniffyduke »

Oh, and all the wire is silver plated teflon 20g and 18g.
Its about .80c a foot.

I spent allot of money on this buzzer.

Cool thin is zero oscillation...
passfan
Posts: 1353
Joined: Sun Jan 10, 2010 2:01 pm
Location: Central Florida

Re: Rocket Feedback

Post by passfan »

sniffyduke wrote:Oh, and all the wire is silver plated teflon 20g and 18g.
Its about .80c a foot.

I spent allot of money on this buzzer.

Cool thin is zero oscillation...
I'm curious, did you lift your heater supply with a couple of 100 ohm resistors or provide any sort of voltage reference for your heater circuit ? I tapped my B+ at the first preamp tube and provided about +35 volts to reference to and I get absolutely no buzz in my express at all.
"It Happens"
Forrest Gump
sniffyduke
Posts: 90
Joined: Fri Sep 18, 2009 6:10 pm

Re: Rocket Feedback

Post by sniffyduke »

No I did Not
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Colossal
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Location: Moving through Kashmir

Re: Rocket Feedback

Post by Colossal »

Sniffy,

I see you used the new SoZo Blue Molded caps. Any thoughts on their tone in your Buzz Rocket? I have a pile of them here for use in an EH150 build and a pair of Blackface Deluxe Reverbs...
sniffyduke
Posts: 90
Joined: Fri Sep 18, 2009 6:10 pm

Re: Rocket Feedback

Post by sniffyduke »

Colossal wrote:Sniffy,

I see you used the new SoZo Blue Molded caps. Any thoughts on their tone in your Buzz Rocket? I have a pile of them here for use in an EH150 build and a pair of Blackface Deluxe Reverbs...

Oh, It does not buizz that bad with a telecaster.


The Sozo Blues are the best thing that happened to amps LOL

They are amazing...

But you cant tell untill you give them at least 5 hours of playing.
You can actually hear the tone come alive.

YOU HAVE to try it in this build. I have never heard anything like it
Cleans are sweeter than my DC30 and I am not making this up.
I am hard cridic.-
sniffyduke
Posts: 90
Joined: Fri Sep 18, 2009 6:10 pm

Re: Rocket Feedback

Post by sniffyduke »

Its a shame, because of the buzz, i am going to have to tear down.

My high voltage mistake turned out in my favor. I may not get
this again : (

If you hook up a fulltone tape echo, you are in heaven.
sniffyduke
Posts: 90
Joined: Fri Sep 18, 2009 6:10 pm

Re: Rocket Feedback

Post by sniffyduke »

Colossal wrote:Sniffy,

I see you used the new SoZo Blue Molded caps. Any thoughts on their tone in your Buzz Rocket? I have a pile of them here for use in an EH150 build and a pair of Blackface Deluxe Reverbs...
Honestly, it sounds better (cleans) than my dumble clone.
Running at 300v.

These have scooped mids tight bass and tons of sparkle.
Also they are not that bright, at least not yet.

But they have to break in. I hooked an Ipod up and pulled the output tubes.

When you first power up you will be like " Oh gosh, this is bad"
But give it time.
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M Fowler
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Location: Walcott ND

Re: Rocket Feedback

Post by M Fowler »

Sniffy,

I've heard some of your recordings and if you say this amp is great it has to be great. I am glad you are liking it.

Poke around with the chop stick and get that hum/buzz out. :)

Mark
sniffyduke
Posts: 90
Joined: Fri Sep 18, 2009 6:10 pm

Re: Rocket Feedback

Post by sniffyduke »

M Fowler wrote:Sniffy,

I've heard some of your recordings and if you say this amp is great it has to be great. I am glad you are liking it.

Poke around with the chop stick and get that hum/buzz out. :)

Mark
Mark, I poked around and when you put your hand anywhere near the PI section the hum gets louder. So, I am going to redo this section.

I am just hoping its not the sprauge big filter caps. I hit them on accident a couple times and sparked them. Did not know that they would hold that big of charge after 2 days. I usually hace resistors to bleed but I did not do it on this build.

Could the filter caps still be shot even if the B+ voltages are all perfect?

I also have allot of seperate grounds. the only ground that
hosts more than 1 wire is the PT center tap and the fillaments.

Also, could it be those B+ wires running right under the PI section.


I am going to redo the whole back, lets hope I ger the same response.


OH this thing likes 1 vintage 30 and 1 g12h30.
sniffyduke
Posts: 90
Joined: Fri Sep 18, 2009 6:10 pm

Re: Rocket Feedback

Post by sniffyduke »

M Fowler wrote:Sniffy,

I've heard some of your recordings and if you say this amp is great it has to be great. I am glad you are liking it.

Poke around with the chop stick and get that hum/buzz out. :)

Mark
Thanks for all your input : )
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sst4270
Posts: 259
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Location: Glen Burnie, MD

Re: Rocket Feedback

Post by sst4270 »

Can you straighten out and shorten that coil of wire feeding the plates of the power tubes. (blue/white * brown/white) I woud try to get them away from the high voltage wires going to that "voltage select" switch.
Try to run them behind it along the back wall (like on original Rockets).

Those diodes on the rectifier socket... Providing some kind of protection I presume? Could they be a source of hum?

Does felt conduct? Just curious...

Those are just a few things I noticed.

Good Luck,

Steve
sniffyduke
Posts: 90
Joined: Fri Sep 18, 2009 6:10 pm

Re: Rocket Feedback

Post by sniffyduke »

[quote="sst4270"]Can you straighten out and shorten that coil of wire feeding the plates of the power tubes. (blue/white * brown/white) I woud try to get them away from the high voltage wires going to that "voltage select" switch.
Try to run them behind it along the back wall (like on original Rockets).

Those diodes on the rectifier socket... Providing some kind of protection I presume? Could they be a source of hum?

Does felt conduct? Just curious...

Those are just a few things I noticed.



Thanks Steve.


I got rid of a good amount of hum.

I turned these huge flouresent lights off in my work station.

I also redid some of the PI section. And I think that did it.
It lowered my plate voltage I had going to the PI.

Now it sounds normal.

I did however loose that cool sustain. and now it breaks
up around 12:00.

Honestly I think I had a bad component or wiring
in the PI that shot up the voltage.

I do not know what I did before but I loss that sustrain and compression,
that was rather cool.
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rawnster
Posts: 562
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Location: Northwest

Re: Rocket Feedback

Post by rawnster »

I'm glad you're getting some of the wrinkles ironed out on this build. To my understanding, the Rocket is not suppose to have "cool" sustain and compression unless it's really cranked. It's more of a sparkle pallet for pedals. :)
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