Rockster Reverb Layout anyone...

[Bob-I]

any way to make the reverb have a send and return like the dumble SSS?

Yes simple. Replace the 1M grid load into the reverb drive tube with a 1M pot.

[dr. who]

Thank you very much.

[dorrisant]

O.k.,

Thursday night I fired it up and it came to life... listening to it told me something was a little wonkey in the tone stack and the cut was backwards. I opened up my other Rockster type build and copied the proven ts arrangement... and somehow the cut is still backwards... ? I flipped it a different way and snapped some pics... yet to try it.

Another thing... there is a slight hum when the boost switch is off. If the boost is on - no hum... Any thoughts, fellas?

The hum is not all that bad. Just bugging me...Three people said they would take it as is!

We had an amp birthday party on Saturday. Four or five of us were taking turns on my amps. Had a Mesa Dual Rec and JCM800 sitting there as well but no one wanted to play on them...

Many thanks to rj... Hopefully we can post a layout for this soon. Maybe these pics will help too...

Gutshot...

[IMG768]http://i946.photobucket.com/albums/ad30 ... 10365_.jpg[/img]

The tone stack and preamp...

[IMG768]http://i946.photobucket.com/albums/ad30 ... 10362_.jpg[/img]

The PS...

[IMG768]http://i946.photobucket.com/albums/ad30 ... 10360_.jpg[/img]

PS and output section...

[IMG768]http://i946.photobucket.com/albums/ad30 ... 10359_.jpg[/img]

Adjustable cathode bias and preamp tubes...

[IMG768]http://i946.photobucket.com/albums/ad30 ... 10357_.jpg[/img]

And here with temporary faceplate...

[IMG768]http://i946.photobucket.com/albums/ad30 ... 10352_.jpg[/img]

Thanks for checking it out... I appreciate any hum advice in advance!

[dcribbs1412]

dorrisant
Just wanted to say congrats on a beautiful looking build
I got nothin for the boost hum other than try a diff cap
I see you used a radial...hard to make out the connections
what size cap?

Darin

[RJ Guitars]

Beautiful build... very well done.

If you have hum until you add the bypass on that 2nd stage, I think it's telling us something wants a ground in that stage when it's not bypassed... saying the obvious maybe. The cathode resistor should provide the essential ground so apparently there is some ac that the bypass cap is taking to ground. I haven't thought this through entirely but I would look at the coupling caps and grounds on that 2nd stage... I'll look at the pictures too.

rj

[M Fowler]

Beautiful job on your amp.

Is your cap soldered over/under on that switch so the positive is center lug and negative top lug off to ground?

See my crude addition of the boost cap on Normster's layout attached.

Mark

[dorrisant]

Thanks guys for the complements,

Darin - I wanted to use axial but didn't have one... not to blame rj, I might have used it somewhere else. The value is 100uF 50 v. I did check and change it, too. The original measured fine.

rj - I checked all grounds and they are all fine... I don't see how, but wonder about the negligible difference in grounds on the bus. All the caps around it seem fine - dc on one side only.

Mark - The "+" side of the cap is on the top right pole of the boost switch, the "-" ties to the end of the ground bus. The common terminal for the right side of the switch is tied to the tube side of the cathode resistor.

I decided to change things a bit wholesale... I wanted to reduce the "pop" when the boost switch is turned on, so i wired it so that the cap would be pre-loaded.

I tied "+" end of the bypass to the tube end of the cathode resistor and the other "-", to the common of the switch. That common terminal is grounded via a 150k resistor... to load the cap. The top right terminal is grounded to swamp out the 150k when the switch is engaged.

Then I snapped some pics and tried it out...

Same thing... still humming without boost and the pop is still there. So I noted what was happening in relation to the controls...

Hum is moderate at 0 volume... up a bit till noon and it starts fading out at 9:00 then it fades to a gainey hiss as it is turned up to max.

The treble brings it into focus as you turn it up.

Mid control doesn't do much to it...

Bass brings it up as well... to be expected... sound like 60 Hz.

Maybe I wired it wrong, but the hum remains wired either way...

Anyway here's some pics of the new wiring...

[IMG:896:768]http://i946.photobucket.com/albums/ad30 ... 10502_.jpg[/img]

[IMG768]http://i946.photobucket.com/albums/ad30 ... 10493_.jpg[/img]

Thanks again for the compliments and the advice,
Tony

[Bob S]

Beautiful build dorrisant. Very very nice.
I know you will love it.
That perfboard looks great - where did you get it from?
Wish I could help with noise - grounding has already been covered.
Anyway congratulations.

[M Fowler]

It may be just a matter of tightening all those various ground tabs.

I am posting a picture of my Reverb Rocket showing how I used two different caps on V1b to a DPDT switch center off so that the owner can toggle between the two different levels of boost. I believe they are 10uf and 25uf 25volt caps. This is a tubes down version so layout is opposite.

Mark

[dorrisant]

Had to give an updated report... the hum has faded to non-existance. The last pics show how I left it... no more changes. I should have postd this sooner because it faded out a week or two after my last post and has been fine for some time. I haven't touched it internally.

I can't complain since the hum is gone but still don't know what in the heck it was... Oh well.

[dorrisant]

Not too long ago..

https://www.youtube.com/watch?v=w61YNUW ... ata_player

Boscoe France... If you don't know about him you should!

Tony

[statorvane]

Thanks. I love power trios. Is he playing through a wreck?

[dorrisant]

Thanks. I love power trios. Is he playing through a wreck?

The trio is: Boscoe France on guitar, Jimmie Cummings on drums and John Gillespie on bass.

Boscoe was playing on the amp that is pictured above through two Celestions in an old Fender 2x12 cab that has been divided and sealed. It is directly behind him relative to the camera. He also has his old converted Masco amp set up as well but was not using it at the time.

We are lucky to live in a very music oriented town here in southern Indiana (read nothing else go do). Lots of talent around here.

If you look into it, Boscoe was the dude who won the 2012 Gutar Center Battle of the Blues contest. He won a recording deal so you should be hearing more about him soon.

Tony

[Colossal]

Great job on that amp Tony! Looks fantastic and sounds killer.

[dorrisant]

Thanks Dave... You are too kind...

Here is another local guy, Terry Sator, trying it out (sorry about the video quality). Mark, the guy in the black t-shirt, bought this amp. I have it here now putting footswitches in it for him.

http://www.youtube.com/watch?v=YX3ss97dLrc

Tony