New Rocket Build

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

Moderators: pompeiisneaks, Colossal

User avatar
Blackburn
Posts: 1765
Joined: Tue Feb 05, 2013 8:39 pm
Location: Texas

New Rocket Build

Post by Blackburn »

Just did another Rocket a little while back. A few variations from Ken's original work. You should notice them immediately. PI caps are 716Ps with 6PS for the tonestack. Original Dynaco A-470 OT and my own spec'd PT from Heyboer. Choke is the Hammond 158L. Nothing too different from the basic Rocket DNA. Tubes are as follows...

TAD 5AR4 V8
Sovtek EL84Ms V4 - V7
TAD 7025WA V2 - V3
JJ ECC803S V1

This amp sounds pretty nice. I temporarily clipped in the extra 22uf bypass on the second stage and added another 220k to make the voltage divider before the PI entrance. It's a fantastic option for a richer overdrive and slight attenuation, but the cleans aren't as nice IMO. We can thank 2Tone for mentioning it. He said Ken would suggest it occasionally. It may not have made it in any Rockets, but it's in the Z-Wreck. :)

DK
You do not have the required permissions to view the files attached to this post.
User avatar
Blackburn
Posts: 1765
Joined: Tue Feb 05, 2013 8:39 pm
Location: Texas

Re: New Rocket Build

Post by Blackburn »

A couple shots of the outside.
You do not have the required permissions to view the files attached to this post.
User avatar
martin manning
Posts: 14308
Joined: Sun Jul 06, 2008 12:43 am
Location: 39°06' N 84°30' W

Re: New Rocket Build

Post by martin manning »

Very nice! I'm cooking up a Rocket myself, so thanks for the pics and ideas. These two ground lugs look like they need solder:
You do not have the required permissions to view the files attached to this post.
User avatar
Blackburn
Posts: 1765
Joined: Tue Feb 05, 2013 8:39 pm
Location: Texas

Re: New Rocket Build

Post by Blackburn »

martin manning wrote:Very nice! I'm cooking up a Rocket myself, so thanks for the pics and ideas. These two ground lugs look like they need solder:
Thanks Martin! I thought the same thing after I took the pics, but they're soldered. I recall being very sparse with the solder there. I think I changed a wire or two and that's why it came out ugly. Such a rookie move not tinning my leads... :oops:
You do not have the required permissions to view the files attached to this post.
User avatar
martin manning
Posts: 14308
Joined: Sun Jul 06, 2008 12:43 am
Location: 39°06' N 84°30' W

Re: New Rocket Build

Post by martin manning »

Ah well, pictures can often be deceiving wrt solder joints. Switchcraft jack lugs require quite a bit of heat to flow out nicely too.
User avatar
Blackburn
Posts: 1765
Joined: Tue Feb 05, 2013 8:39 pm
Location: Texas

Re: New Rocket Build

Post by Blackburn »

Yeah, I got sick of them looking like that so I touched them up a bit after my post. I guess it looks a bit better now, not that it really matters. I'm looking forward to seeing your Rocket when it's done.
Paultergeist
Posts: 189
Joined: Tue Dec 12, 2006 5:18 pm

Re: New Rocket Build

Post by Paultergeist »

Blackburn, I have a question: in your first photo, there is a black square-shaped component soldered to the left-most lug of the "Cut" pot. This component is also connected to the ground buss bar as well as the board. I do not recognize either the component itself or the relationship with the Rocket documents (layout, etc)......trying to figure out what is going on there.

Can you elaborate?
User avatar
M Fowler
Posts: 14036
Joined: Wed Jan 16, 2008 2:19 am
Location: Walcott ND

Re: New Rocket Build

Post by M Fowler »

Paultergeist wrote:Blackburn, I have a question: in your first photo, there is a black square-shaped component soldered to the left-most lug of the "Cut" pot. This component is also connected to the ground buss bar as well as the board. I do not recognize either the component itself or the relationship with the Rocket documents (layout, etc)......trying to figure out what is going on there.

Can you elaborate?
Nothing there when I look at that photo? Cut pot left pin wired to board, center pin has CDE .0047 cap wired to board. High Cut Control.
User avatar
Blackburn
Posts: 1765
Joined: Tue Feb 05, 2013 8:39 pm
Location: Texas

Re: New Rocket Build

Post by Blackburn »

Paultergeist wrote:Blackburn, I have a question: in your first photo, there is a black square-shaped component soldered to the left-most lug of the "Cut" pot. This component is also connected to the ground buss bar as well as the board. I do not recognize either the component itself or the relationship with the Rocket documents (layout, etc)......trying to figure out what is going on there.

Can you elaborate?
I think Mark's right and you're talking about my hi cut cap. It's a big SOB! :) I'm not sure why you think it's soldered to the ground buss or the left most lug of the pot. It's soldered to the wiper.
Paultergeist
Posts: 189
Joined: Tue Dec 12, 2006 5:18 pm

Re: New Rocket Build

Post by Paultergeist »

Blackburn wrote: I think Mark's right and you're talking about my hi cut cap. It's a big SOB! :) I'm not sure why you think it's soldered to the ground buss or the left most lug of the pot. It's soldered to the wiper.
Thank you Mark and Blackburn......

I was looking at the photo using my (home) iPad, and the resolution was not strong enough to really discern fine detail -- I mis-interpreted what I was seeing. Using a desktop computer (at work), I am now zooming in and it all makes sense. That is a big cap indeed!

Thanks you both for the clarification.
User avatar
angelodp
Posts: 2157
Joined: Tue Jan 15, 2008 2:45 am
Location: L.A.

nice job

Post by angelodp »

Is that an 1/8" think board you used... beefy. I suppose the eyelets are extra long as well? Do my eyes deceive me or are those caps extra large size... the orange caps.
Last edited by angelodp on Thu Jul 10, 2014 11:56 pm, edited 1 time in total.
User avatar
RJ Guitars
Posts: 2663
Joined: Tue Nov 14, 2006 3:49 am
Location: Los Alamos, New Mexico
Contact:

Re: New Rocket Build

Post by RJ Guitars »

Nice looking build!
Good, Fast, or Cheap -- Pick two...

http://www.rjguitars.net
http://www.rjaudioresearch.com/
http://diyguitaramps.prophpbb.com/
eniam rognab
Posts: 763
Joined: Wed May 15, 2013 4:06 am

Re: New Rocket Build

Post by eniam rognab »

WOW dave! that is one beauty inside and out!

i like how you 're-did' the cap-stack, zip ties going through a sticky backside mount?

wow, if you just read the last three words of the preceding sentence :oops:

i do like your innovative design though and the way you did the grid and screen resistors on the output, again, innovative. you have some great ideas my friend :D

but where is the electrical tape??? yellow has the best tonal response :lol:

JK-IDK-YMMV-Hippity Hoppitus, very gord, very gord
User avatar
donzoid
Posts: 497
Joined: Mon Mar 11, 2013 2:22 am
Location: Salem, Oregon

Re: New Rocket Build

Post by donzoid »

My eyes are turning green! Nice build indeed. Can you (yeah, I know) show me where you had the extra 220K drop resistor? I am thinking of trying that as well on my 18w Rocket as it has so flippin' much gain it really has no need to go beyond 10 o'clock so I thought that might give me more control over the gain using the vol. knob.

Kinda like to hear your thoughts on that JJ V1 tube. I have a balanced one I bought for a PI, and I didn't like it there, but maybe V1 is a better place?
https://www.facebook.com/trialbyfirerocks

Be sure your tinfoil hat has a good low impedance ground.
User avatar
Blackburn
Posts: 1765
Joined: Tue Feb 05, 2013 8:39 pm
Location: Texas

Re: New Rocket Build

Post by Blackburn »

angelodp wrote:Is that an 1/8" think board you used... beefy. I suppose the eyelets are extra long as well? Do my eyes deceive me or are those caps extra large size... the orange caps.
Yeah, it's 1/8" board from WTA, and very beefy indeed. He offers two lengths of eyelets and you are correct that they are the longer of the two. The caps I assume you're referring to are the PI caps and those are 716Ps. They're pretty skinny and taller than the 6PS. Inexpensive PPs and pure copper leads. I dig! :)
donzoid wrote:My eyes are turning green! Nice build indeed. Can you (yeah, I know) show me where you had the extra 220K drop resistor? I am thinking of trying that as well on my 18w Rocket as it has so flippin' much gain it really has no need to go beyond 10 o'clock so I thought that might give me more control over the gain using the vol. knob.

Kinda like to hear your thoughts on that JJ V1 tube. I have a balanced one I bought for a PI, and I didn't like it there, but maybe V1 is a better place?
I had it hanging where the 220k and PI entrance cap meet. I didn't solder it in. I just wrapped the lead around that tiny jumper on the board and clipped the other end to the ground buss. You'll definitely hear a reduction in gain and more richness in overdrive. It's a great mod for that, but the cleans aren't as good IMO, like I said.

As for that JJ... It's a fancy JJ. :roll: It actually is kind of nice, with gold pins and what not. It has a longer plate and has a nice, fat tone, working great for V1. I put it there because I'm using triple mica TAD 7025s and those are short plates with less gain. They're pretty darn quiet! Very chimey, too. Longer plates seem to have more gain and in a higher gain amp, like a LP or Express, can be pretty noisy. I wouldn't mind those TADs in every spot, though. I tried them out in a couple other amps and really dig them. Very nice tubes for modern production.
Post Reply