Rocker 30 circuit

Orange Amps Technical Q&A's

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Jondog
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Re: Rocker 30 circuit

Post by Jondog » Mon Feb 18, 2013 5:57 pm

kell wrote:Hi,

I think there is more than one mistake. :shock:
Have a look at this schem.
http://www.orangefieldguide.com/OFG_SCH ... sheet1.jpg" onclick="window.open(this.href);return false;
... wouldn't be surprised if yours is similar to this – of course pure guesswork. :roll:

I also noticed, there is no grid leak resistor before R28 to ground (dirty channel). Did you forget it, or do both channels share the same? (Clean channel has R24/1M e.g.) :?: :!:

Cheers
Thats where I'm getting confused. The Rockerverb uses SPST relays. But if I were to do a re-build it would probably work with that method I suppose. As for the grid leak, I didn't put it in the schematic, guess I should. The two channels share R24 and it grounds out to the cathode capacitor ground on the Natural channel
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kell
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Re: Rocker 30 circuit

Post by kell » Mon Feb 18, 2013 7:46 pm

Jondog,

your switching logic needs a second view with eagle eyes!
The longer I look at it, the less it makes sense. Please check it again.

Cheers

Jondog
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Re: Rocker 30 circuit

Post by Jondog » Tue Feb 19, 2013 5:49 pm

kell wrote:Jondog,

your switching logic needs a second view with eagle eyes!
The longer I look at it, the less it makes sense. Please check it again.

Cheers
Pretty sure I've got it sorted out now. Took a break and came back at it from a different angle. I was basically looking at it backwards and it was confusing me. Took me about a minute to figure it out with a new point of view. Been spending too much time with it!
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kell
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Re: Rocker 30 circuit

Post by kell » Tue Feb 19, 2013 5:55 pm

... sounds familiar to me. :wink:

Cheers

Jondog
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Re: Rocker 30 circuit

Post by Jondog » Tue Feb 19, 2013 11:53 pm

Makes sense to me anyways, even if it's not right.
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Last edited by Jondog on Wed Feb 20, 2013 7:45 pm, edited 2 times in total.
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jontheid
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Re: Rocker 30 circuit

Post by jontheid » Wed Feb 20, 2013 12:25 am

Makes sense to me, except I can't find a cap labelled C21 on the dirty channel schematic - is it the 1st interstage coupling cap?

Excellent work by the way, I've wanted to know what is in the heart of the Rocker for years.

Jondog
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Re: Rocker 30 circuit

Post by Jondog » Wed Feb 20, 2013 12:36 am

jontheid wrote:Makes sense to me, except I can't find a cap labelled C21 on the dirty channel schematic - is it the 1st interstage coupling cap?

Excellent work by the way, I've wanted to know what is in the heart of the Rocker for years.
Yes, I just noticed on the schematic I uploaded I didn't label the capacitor number, but it's the 1n0 cap before R44. Thanks for the compliment. I got tired of waiting for it to show up somewhere, so I made it show up.
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jontheid
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Re: Rocker 30 circuit

Post by jontheid » Wed Feb 20, 2013 12:49 am

I'm sure Gladmarr would be more than happy to host the schematics on the Orange Amp Field guide when completed.

Jondog
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Re: Rocker 30 circuit

Post by Jondog » Wed Feb 20, 2013 2:03 am

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Last edited by Jondog on Wed Feb 20, 2013 11:38 am, edited 1 time in total.
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kell
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Re: Rocker 30 circuit

Post by kell » Wed Feb 20, 2013 7:20 am

Great work! :D

I noticed R39 on the Natural Channel, 140Ω is much too low.

Suggestion :idea: : If R26/68k is made much smaller there will also be less noise, as this one is in series and the first gain stage is maxed out for gain. Especially the Dirt Channel benefits from this (less noise and hiss). If RF occurs a liitle cap can be soldered directly from grid to ground as a shunt.

Jondog
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Re: Rocker 30 circuit

Post by Jondog » Wed Feb 20, 2013 1:52 pm

kell wrote:Great work! :D

I noticed R39 on the Natural Channel, 140Ω is much too low.

Suggestion :idea: : If R26/68k is made much smaller there will also be less noise, as this one is in series and the first gain stage is maxed out for gain. Especially the Dirt Channel benefits from this (less noise and hiss). If RF occurs a liitle cap can be soldered directly from grid to ground as a shunt.
I've been questioning that resistor R39 since I first did it. The bands are really close together and they are 5 band resistors, each end has a brown band as they all do (1% tolerance) and couldn't tell which end was which. Does a 1M seem like it would work in your opinion? That's the value reading it the other way around.
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kell
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Re: Rocker 30 circuit

Post by kell » Wed Feb 20, 2013 2:06 pm

Which colours can be seen? Brown on both ends, one is yellow and the other two?
Of course 1M could make sense...

Jondog
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Re: Rocker 30 circuit

Post by Jondog » Wed Feb 20, 2013 2:34 pm

kell wrote:Which colours can be seen? Brown on both ends, one is yellow and the other two?
Of course 1M could make sense...
Black,Black
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kell
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Re: Rocker 30 circuit

Post by kell » Wed Feb 20, 2013 2:49 pm

Definitley 1MΩ. :)

Neiloler
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Re: Rocker 30 circuit

Post by Neiloler » Sat Apr 19, 2014 3:09 am

This has me intrigued. I'm late to the party, but that's nothing new. :)

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