Matchless dc-30 reverb schem?

Henrik · 10-26-2009, 09:10 PM

Hi all!
It's been ages since I last posted here - work and other things have kept me from building anything significant the last few years. However, I just scored some transformers and I'm itching to get started again. I'm planning to build something loosely based around the matchless dc-30, one of my all time favourites. I've read that this amp is now available with reverb, and I'd love to know how they solved it, i.e. where did they tap the signal, where does it go back in and does it work on both channels?
So, has anyone out there added reverb to a dc-30 type circuit (perhaps a vox AC 30) and is there a schematic out there?

Thanks!
Henrik

Tubenit · 10-27-2009, 05:58 PM

I have NOT built this amp. This is just a draft idea of how I would attempt to add reverb to this amp.

I have successfully used this type of one tube reverb on numerous builds. My current 3 amps all have a mstr vol going into a LTPI. I inserted the reverb between the mstr vol and the LTPI.

With respect,
Tubenit

Henrik · 10-27-2009, 07:06 PM

Hi, and thanks for your reply!
This looks like it should work, but can you tell me how it compares to the "benchmark", a blackface fender circuit. In the fenders, the signal is mixed accross a 3.3meg resistor, whereas this circuit calls for just 100k. This has me thinking that the reverb signal in this amp will make up a smaller portion of the signal being fed to the PI, thus making it less prominent than in the Fender. Also, with the signal being tapped so late in the circuit, wouldn't cranking the preamp here result in the dry signal being fairly distorted? I've been led to believe that the reverb sounds better when being fed a cleanish signal.
Please let me know if my presuptions here are off the mark or not, and if you think this circuit provides reverb to rival a Fender.

Thanks!
Henrik

Tubenit · 10-27-2009, 10:38 PM

Hopefully this will be helpful to you:

Adding 1-tube reverb

And if you have the free download program ExpressSCH or Jschem, there is an editable schematic and layout here:

http://www.el34world.com/Forum/index.php?topic=575.0

With respect, Tubenit

10-26-2009, 09:10 PM	#1
Henrik Junior Member Join Date: Oct 2009 Posts: 2	Matchless dc-30 reverb schem? Hi all! It's been ages since I last posted here - work and other things have kept me from building anything significant the last few years. However, I just scored some transformers and I'm itching to get started again. I'm planning to build something loosely based around the matchless dc-30, one of my all time favourites. I've read that this amp is now available with reverb, and I'd love to know how they solved it, i.e. where did they tap the signal, where does it go back in and does it work on both channels? So, has anyone out there added reverb to a dc-30 type circuit (perhaps a vox AC 30) and is there a schematic out there? Thanks! Henrik

10-27-2009, 10:38 PM	#4
Tubenit Senior Member Join Date: Jul 2007 Location: Charlotte, NC Posts: 125	One tube reverb Hopefully this will be helpful to you: Adding 1-tube reverb And if you have the free download program ExpressSCH or Jschem, there is an editable schematic and layout here: http://www.el34world.com/Forum/index.php?topic=575.0 With respect, Tubenit Last edited by Tubenit; 10-27-2009 at 10:45 PM.

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10-27-2009, 07:06 PM	#3
Henrik Junior Member Join Date: Oct 2009 Posts: 2	Hi, and thanks for your reply! This looks like it should work, but can you tell me how it compares to the "benchmark", a blackface fender circuit. In the fenders, the signal is mixed accross a 3.3meg resistor, whereas this circuit calls for just 100k. This has me thinking that the reverb signal in this amp will make up a smaller portion of the signal being fed to the PI, thus making it less prominent than in the Fender. Also, with the signal being tapped so late in the circuit, wouldn't cranking the preamp here result in the dry signal being fairly distorted? I've been led to believe that the reverb sounds better when being fed a cleanish signal. Please let me know if my presuptions here are off the mark or not, and if you think this circuit provides reverb to rival a Fender. Thanks! Henrik

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