Please check my layout for my OD reverb

Normster · Post by **Normster** » Sun Aug 20, 2006 10:29 pm

Those are all magic Dumble gadgets. Dumble is actually short for "Dumbledore."

The Accent switch is like a presence circuit. It adds a touch of brilliance to the top end.
The Master controls the overall amp volume.
The switch next to it is a channel switch (assuming you don't use relays for channel switching).
The Level controls the OD output volume (in relation to the clean volume).
The Drive controls the amount of gain (or distortion) you get from the OD section.
The Trimmer controls the amount of signal you pump into the OD section.
The Jazz/Rock switch shapes the tone, but I don't know of anyone who uses the jazz position.
The Deep switch softens the tone a bit. (Think Carlton)
The Bright switch brightens the top end.
The switch at the back is for a local feedback loop which again shapes the tone making it a bit "rounder."

jackson649 · Post by **jackson649** » Sun Aug 20, 2006 10:52 pm

Thanks for the reply, but what does the trim pot attached to B+3 do?

Normster · Post by **Normster** » Mon Aug 21, 2006 1:47 am

jackson649 wrote:Thanks for the reply, but what does the trim pot attached to B+3 do?

That's a balance adjustment for the phase invertor.

jackson649 · Post by **jackson649** » Sun Oct 22, 2006 12:23 am

Hello, i've been compiling parts for this build and am having truobles with the filter caps. With the layout I have now, I will be using two 200uf cap in series with 330k resistors across them.

The problem is that I am having troubles finding 200uf capacitors. Will this power supply board work if I subsitute them with 100uf and 270k.

Thanks

Bob-I · Post by **Bob-I** » Sun Oct 22, 2006 2:33 am

jackson649 wrote:Hello, i've been compiling parts for this build and am having truobles with the filter caps. With the layout I have now, I will be using two 200uf cap in series with 330k resistors across them.

The problem is that I am having troubles finding 200uf capacitors. Will this power supply board work if I subsitute them with 100uf and 270k.

Thanks

Try 220uF/350V caps. Xicon and Sprague both make these. 330k and 270k will both work, I used 100uF/350V on mine and it's fine.

fp2000 · Post by **fp2000** » Tue Oct 24, 2006 9:55 pm

Can someone tell me why do you need 6 diodes for the rectification instead of maybe 4 or 2? The current going through them is the same.

Bob-I · Post by **Bob-I** » Tue Oct 24, 2006 11:17 pm

fp2000 wrote:Can someone tell me why do you need 6 diodes for the rectification instead of maybe 4 or 2? The current going through them is the same.

I use 4.

skyboltone · Post by **skyboltone** » Wed Oct 25, 2006 5:48 am

fp2000 wrote:Can someone tell me why do you need 6 diodes for the rectification instead of maybe 4 or 2? The current going through them is the same.

Peak inverse voltage. The ubiquitous 4007 won't handle the PIV in the power supplies of most of these amps. Two works, three is better because each diode sees it's fraction of the voltage. A point of arguement probably. Though I don't know why. Stack some Zener diodes for edification. They leak on purpose. 4007's cost $.04 each. Splurge

PIV equal RMS X 1.73

Dan

jackson649 · Post by **jackson649** » Wed Nov 08, 2006 11:38 pm

Well, its been a long while but I'm almost finished wiring everything except for a few caps. I also built a speaker and head cab for this project. But I have a couple questions about the reverb setup.

On the reverb pan, the RCA jacks are marked IN and OUT. Does pin 7 on V4 tube go to the IN and the green wire on the reverb transformer go to the OUT jack?

Also, I bought an tolex reverb tank bag and I do not know how I am suppose to mount this in the cab? Thanks

Bob-I · Post by **Bob-I** » Thu Nov 09, 2006 4:57 am

jackson649 wrote:Well, its been a long while but I'm almost finished wiring everything except for a few caps. I also built a speaker and head cab for this project.

Cool, how about some pics.

But I have a couple questions about the reverb setup.

On the reverb pan, the RCA jacks are marked IN and OUT. Does pin 7 on V4 tube go to the IN and the green wire on the reverb transformer go to the OUT jack?

the other way around. The green wire goes to the in of the tank, the out of the tank goes to the grid of the recovery stage.

hipbluescat · Post by **hipbluescat** » Thu Jun 14, 2007 10:02 am

Hello

Are there any chances for any photos ?

Regards

Paul

jackson649 · Post by **jackson649** » Wed Jul 04, 2007 5:16 pm

Hello, I haven't been around here in a while, been busy with other stuff. Here is a link to the completed amp from months ago. I plan to post some videos hopefully soon so maybe I can start tweaking.

https://tubeamparchive.com/viewtopic.ph ... highlight=

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