Dumble SE

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El_Martin
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Joined: Sun Jun 11, 2006 8:49 am

Dumble SE

Post by El_Martin »

Hi there!

Been a lazy poster but a busy reader for a while. Very inspiring & great people around!

Little amps are my obsession. Up to now I've build a SE KT 66 Champ, a GA-5 Variant (ss rectified) and just finished the turretboards for a 15 W Liverpool.

Can see some kind of D*mble on the horizon :)
Could be a D'Lite...since there are some appropriate irons around my workbench.

I was just wondering if anyone ever has tried a SE D*mble.
The singing sustaining tone is already THERE.
Adding gain stage(s) and/or some local feedback should work.

Did I miss a schematic or is it BS???

Ciao
Martin
ampgeek
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Re: Dumble SE

Post by ampgeek »

Greetings Martin,

Mark drew up the DLite schematic and it can be found here on the Dumble Files page:

https://tubeamparchive.com/viewtopic.php?t=2528

Good luck!
Dave O.
ampgeek
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Re: Dumble SE

Post by ampgeek »

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Funkalicousgroove
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Re: Dumble SE

Post by Funkalicousgroove »

You might try modifying this schemo-
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El_Martin
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Re: Dumble SE

Post by El_Martin »

Thank you guys for your input!

Hm...have to work on it. Surely can be done. Seems like a good project to postpone :wink:

Ciao
Martin
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Funkalicousgroove
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Re: Dumble SE

Post by Funkalicousgroove »

I mention this circuit simply because it has a very HRM'ish quality to the tone, it really does! I gig with the little bastard!
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ampgeek
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Re: Dumble SE

Post by ampgeek »

I have been DYING to build a small, flexible, SE amp just to have one in the arsenal. This looks like an excellent candidate!

Funk: Any chance that you could quickly share with us your thoughts/selections on the following for this little bugger?

Preferred speaker configuration (e.g., 1 X 12, 2 X 10, etc) and speaker type

Iron selection/part numbers

SS vs tube recto

Anything else interesting/worthy of note

Sorry to hijack this one but I suspect that Martin may very well be interested in the same information.

TIA,
Dave O.
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Funkalicousgroove
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Re: Dumble SE

Post by Funkalicousgroove »

I bought it as a kit, So I used Dave Allen's transformers, He no longer sells the chassis, but he still sells the Iron.

I run an EH KT88 with a plug in SS recto, or a JJ E34L with a 5Y3. I changed the cathode resistor to 300 ohm, I changed the voltage divider after the first stage to lower it because it's a little over the top gain wise, I changed the .047 coupler on V1 to a .02 to tighten up the bass a bit.

At some point I plan to put a.001 across one of the plate resistors to round off the top end.

I get more tone compliments when I play this amp than probably any other rig I play.
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El_Martin
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Re: Dumble SE

Post by El_Martin »

No problem, Dave!

There is still an empty tube socket in my monster champ :)
ampgeek wrote: ... Sorry to hijack this one but I suspect that Martin may very well be interested in the same information.

TIA,
Dave O.
any input appreciated

Ciao
Martin
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Funkalicousgroove
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Re: Dumble SE

Post by Funkalicousgroove »

You could add Tremolo, or an FX loop, or single tube reverb, or another gain stage and Cathode follower before the tonestack.
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Funkalicousgroove
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Re: Dumble SE

Post by Funkalicousgroove »

Dave O,

Mine is a head, I like it through a 1x12 with an oval port.
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ampgeek
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Re: Dumble SE

Post by ampgeek »

Excellent stuff!

Thanks much Funk.

Hmmm....1 X 12" with oval back kinda sorta like what I am going to do with my homegrown D'Lite, an Avatar cab and your G1265?!?! :D

Martin: Double check here for some good starting guidance on a one tube reverb plan that you might find interesting. I have yet to build an amp with reverb so I can't comment first hand on how it works. I am certain that there is a Hoffman forum that will give you that info though.

My recollection is that even though you won't get total "surf city" it is very useable for those of us that desire a reasonable level of effect for "flavor".

http://www.el34world.com/charts/reverbmod.htm

Dave O.
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Funkalicousgroove
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Re: Dumble SE

Post by Funkalicousgroove »

it won't do a pure clean sound, but it's great for blues and classic rock!
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El_Martin
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Re: Dumble SE

Post by El_Martin »

Thanks again, gents!

...my favoured speaker enclosure is my old oversized WEM Dominator cabinet w. Cel. G12/65 (bought it new in the early 80ties as a combo...)

Lots of ideas emanating from this fred 8)

Ciao
Martin
ampgeek wrote:Excellent stuff!

Thanks much Funk.

Hmmm....1 X 12" with oval back kinda sorta like what I am going to do with my homegrown D'Lite, an Avatar cab and your G1265?!?! :D

Martin: Double check here for some good starting guidance on a one tube reverb plan that you might find interesting. I have yet to build an amp with reverb so I can't comment first hand on how it works. I am certain that there is a Hoffman forum that will give you that info though.

My recollection is that even though you won't get total "surf city" it is very useable for those of us that desire a reasonable level of effect for "flavor".

http://www.el34world.com/charts/reverbmod.htm

Dave O.
Aharon
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Re: Dumble SE

Post by Aharon »

Funkalicousgroove wrote:You might try modifying this schemo-

Is the 3rd stage what they call a fake PI?.
Thanks Funk for posting the schem.

Aharon
Aharon
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