Combined OD with Dumbleator ??

[Phazor]

Just wondering if anybody has tried putting a Dumbleator with an OD section in one box. I was thinking about adding it to a Fender where normal channel has a low plate clean channel and the Dumbleator would contain the OD Switching and loop function. I know its a diversion of layout but just wondering if anyone has experiment with this idea. Good/Bad idea? This might not belong in this section but starting here.

Thanks

[bluesfendermanblues]

Why not? Sounds like a fun project idea.

Regarding the design of the OD, you could take some inspiration from the Bluesmaster design (or maybe even Mesa Boogie's MK II).

Could be developed into a commercial product as an add on for fender like amps......(I saw a product like that 20 years ago in Guitar Player, with 9 pin connectors to be put between the preamp tubes and sockets - can't remember the make though.)

[ToneMerc]

.(I saw a product like that 20 years ago in Guitar Player, with 9 pin connectors to be put between the preamp tubes and sockets - can't remember the make though.)

Fender Mender?

http://www.mo-toyz.com/

http://www.mo-toyz.com/images/mender-instructions.jpg

TM

[M Fowler]

Schematic

[bluesfendermanblues]

Exactly!

[Luthierwnc]

not exactly what you are thinking of but there are some similar elements:

https://tubeamparchive.com/viewtopic.ph ... hlight=hrm

[Phazor]

Luthierwnc do you have any clips you have recorded? I'm interested in the tone and sustain quality.

I have played with a Fender using the Tremolo tube as the OD and modified normal channel to a Dumble skyliner. It works but not bowling me over. After reading the post in your Preamp HRM I'm now convinced the Sag off the LTP (or simulation of power rail sag) is important to the bloom so I need to re think a little. I made a rule I would not touch the Power string resistors/caps so as to keep the beautiful stock Black Face sound. That limits the full scope of the Dumble circuit. Just trying to have the fender clean and the Dumble Overdrive as you are with your preamp. It's hard to imagine sag with a precision power supply but numerous people point it out in your thread.

[Luthierwnc]

Sorry, no clips. I recently sold that item sort-of by accident. There was a picture of it with something else I was selling and I got an offer. I built it to give me some D alternatives on a D-based amp and it really wasn't necessary. It would be perfect for a big Ampeg.

You'll find this reference in the archives but these D-amps are a system. Every resistor depends on what came before it. You are also dealing with a circuit where the OD and the loop come after the tone-stack. Most rigs put the dirt in front of the first tube and overpower the stack.

There are two ways I'd go if I didn't make my own: 1) put a push/pull pot in place of the Mid pot (or Bass pot if you don't have a Mid) with a 150k resistor to ground like the PAB on my schematic. Seven-eight bucks for my personal favorite Dumble mod. If your amp has return and send jacks, get a Dumbleator and turn it up past parity for more honk late in the circuit.

2) Just get or build a D-head and A/B it with your current amp. Trying to replicate something this complex around your amp will be expensive and frustrating. Plus, you have the Fender clean on the clean side anyway. At bottom, the first tube on these is a silverface Bassman with some interesting tone-shaping changes.

Sorry to not have some less spendy recommendations. I've made or remade about 10 of these amps now and to get it pure, you have to stay pretty close to the path. sh

[Phazor]

I keep coming back to choice 2. Thanks