UP dumble for sale

[jelle]

It is a mod to Fender amps as far as I know it.

[FUCHSAUDIO]

Really...lol....

I remember when there was that article about HAD and he showed all these rack mount things, and all the amps piled up behind his house...and there was discussion of the Phoenix, Odyssey and all these "new models" that this mad genius was going to make...I assumed this was part of that lineup..and I guess we'll all wonder what happened to those lofty goals ?

[jelle]

Several of the best designs were never shown to the public.

I kind of like how he rolls.

[Smokebreak]

Several of the best designs were never shown to the public.

I kind of like how he rolls.

Now how would you know this, Jelle?

[Max]

I was under the impression the HH was a model unto itself like an Overdrive Special or SSS etc...not a mod..

Guitar Player Magazine:
"How many watts are the various models?

Alexander Dumble:
"The overdrives are 100 watts, but they're switchable down to 50, and I do make a special 150-watt Overdrive, which is a lot of fun. The range in power goes from a 25-watt recording amp called the Hotel Hog up to the 450-watt Winterland, named after the concert hall in San Francisco."

Source: http://thesubjectmatter.com/dumblearchi ... efault.htm

Cheers,

Max

[Smokebreak]

Hey Max, do you know the story behind the Hotel Hog name?

[Bombacaototal]

I am wondering how the reverb sounds with the hotel hog mods. I tend to find the blackface are too strong and I can only use it up until 2. Did the Dumble mods improve on that?

Also what is the value for the resistor next to the 500pF in V4b? 220k?

Lastly the tremolo circuit seems fairly similar to a Blackface in my opinion. I could not spot differences

[Bombacaototal]

I noticed an non-shared cathode cap/resistor on V1 pin 8 in pics that is not in the drawing. Looks like a typical 1.5k.

Glad you guys are having fun with it.

The V1A section has a cathode of 1.5K and 25uf grounded to chassis, V1B on the board, same 1.5K//25uf. That drawing is not perfect... But I tried.

The Reverb driver LNFB could be 3.3M. The actual value required seems to vary per amp.

Is there any difference in doing this the other way around: V1a at the board and V1b at the chassis?

[Bombacaototal]

I was under the impression the HH was a model unto itself like an Overdrive Special or SSS etc...not a mod..

Guitar Player Magazine:
"How many watts are the various models?

Alexander Dumble:
"The overdrives are 100 watts, but they're switchable down to 50, and I do make a special 150-watt Overdrive, which is a lot of fun. The range in power goes from a 25-watt recording amp called the Hotel Hog up to the 450-watt Winterland, named after the concert hall in San Francisco."

Source: http://thesubjectmatter.com/dumblearchi ... efault.htm

Cheers,

Max

Thanks for the link! I particularly like the part he speaks about the speakers he uses on the Dumbles

After experimenting with various speakers, what do you favor?

I've gone with everything, there are a lot of things I still like. The most versatile is the EV. But all manufacturers, include Altec and JBL, make wonderful speakers that do specific jobs other speakers can't do. I divide speakers into two classifications: the efficient and the low-efficient. Both are very useable. Low efficiency speakers are things like Celestion and Jenson and PAS. Usually because of the physical construction, they don't get the same acoustic level per watt as the Altecs, JBLs, and EVs do. There's an advantage to that, because you can make the amplifier work harder to get the same acoustic level, and a whole different kind of harmonic structure results. I love the sound of JBLs, especially for chords, but I had a lot of trouble with 4" voice coil not traveling in a linear fashion. The actual coil would short out against the magnet structure. The Altecs didn't do that, so I was using them up until '79, when EV started coming out the the EVM series.

How does your philosophy on speaker enclosures contrast with other companies?

I think mine's different. I just don't believe in a baffle board with a couple of sides. Everything is designed to respond tonally. Even my open-back enclosures use air to the optimum. It's an ongoing process; I'm still finding out things that are useful. There's a definite technique to developing enclosures. Instead of increasing the output all from the front by feeding more watts in, I designed a special series of open-back enclosures so that there's actually an air pole inversion process--I make the air respond in an in-phase relationship, both in front and in the rear of the enclosure. So, from the same amount of speakers, it's almost a doubling of sound.

Does that change the tonal quality?

Yes. The low end is absolutely luscious. You feel like you're floating on a football field filled with marshmallows. And it gives a singe to the midrange that puts solos right out there. It works great for chords and solos, but especially well for slide. It's the kind of enclosure that Lindley and Lowell George used.

[Max]

Hey Max, do you know the story behind the Hotel Hog name?

AFAIR what Alexander Dumble told, it's just a joke:

The "Hotel Hog" delivers (more or less) the harmonic content of an ODS at the (low) volume levels suited for a hotel room (or studio environment etc.).

Cheers,

Max

[dorrisant]

What is the resistor value at V3-7&2... at the tube?

[Aaron]

What is the resistor value at V3-7&2... at the tube?

I would say 2k2.

[dorrisant]

Looks like green and orange... 2k2?

[jelle]

15K

[dorrisant]

Thanks Jelle!