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 Technik / Equipment / Instrumente
realman Offline

Beiträge: 103
Punkte: 103

25.11.2007 09:53
Dumble Zitat · Antworten
Hallo Bluesgitarreros,

schaut mal, was es bei Ebay gab.

Aktuelles Gebot: US $75.300,00
(ca. EUR 50.792,58) Mindestpreis nicht erreicht.

General Information

During the last months some reputable tradespeople in the United States have been asked for appraisals for this amp, because the insurance company had asked for an update. As there seems to be only this single specimen of a 150 W Dumble Overdrive Special still in existence, some of these salespeople said some collectors might be willing to pay up to 150,000 US$ for this unique combination of Steel-String-Singer-like and Dumbleland-like clean sounds with an additional, especially sophisticated overdrive channel, reverb and tremolo. (When this amp was sent to Germany it’s price was nearly thrice the price that was prevailing at this time for a normal Overdrive Special 100 Watt.)

For such a high value instrument the insurance company now asks 5 % of its value each year to insure the taking of this amplifier to gigs or on tour. And to pay around 600 $ a month to use this amp on live gigs or tours doesn’t seem to make sense anymore, and to leave the amp alone without using it doesn’t seem to make sense either. (Perhaps Carlos or John or Larry or Robben or anyone else can get a better deal with their insurance companies) So it is for sale now.

Please don’t hesitate to bid any price you think is appropriate and above the starting price. Let’s get in contact and see which price is realistic. There is no hurry and the amp is going to be offered again if no offer meets the reserve price.


Dumble Overdrive Special 150 Watt which Mr. Dumble built for Todd Sharp in the second half of the eighties. Mr. Dumble made only very very few of these amplifiers. Indeed only this single specimen seems to be still in existence. The sisteramp #120, also made for Todd Sharp, has been stolen long ago and never reappeared up to now.

The overdrive section of the preamp is very sophisticated. The overdrive tube is a 7247 and not a 7025 as usual. This amplifier has four (staggered) pots to control the Overdrive: trigger (silver ring in the "level" location), taper (Marshall-like knob in the "level" location), level (silver ring in the "ratio" location), and ratio (Marshall-like knob in the "ratio" location).

Trigger adjusts how much of the scale of signal is fed into one triode of the overdrive tube. Level adjusts how much of the signal is fed into the other triode of the overdrive tube. Taper adjusts the scale of high frequencies in the overdrive section. Ratio adjusts how much of the overdrive circuit's signals is fed back into the preamp circuit.

Especially because the Overdrive tube is a 7247 (two different triodes with different characteristics in one tube) these four pots provide an extremely useful control of the harmonic content in order to fine-tune the overdrive circuit's voicing.

So you can adjust the overdrive section for a vast spectrum of tonal colors that by far exceeds the possibilities of a normal Overdrive Special. It's really amazing.

The reverb section is similar to the reverb section of a Steel String Singer. The send and return controls make possible the perfect blending of the reverb signal and the dry signal in a way that adds a warm singing tone to a huge clean or overdriven guitar tone.

The tremolo has a wide range of operation from very slow (the Ry Cooder tremolo) to very fast . It is extremely useful to achieve beautiful textures for all sorts of Blues and ballads together with the sophisticated reverb.

The power amp is similar to a 150 W Dumbleland (same transformers), but the phase inverter and driver tubes both are 7025s as in a Steel String Singer. The output power can be switched from 150 Watts to 75 Watts. The output impedance is switchable to 4, 8 and 16 Ohms. The original footswitch provides the possibility to switch on and off the overdrive, the preamp boost, the reverb, and the tremolo. Because this amplifier is heavy due to its giant transformers and the huge amount of electronic parts inside, the bias and the dynamic balance can be measured and adjusted the way an Ampeg SVT or V9 can be adjusted.

As you see this amplifier blends the qualities of a very sophisticated version of the Dumble overdrive circuit with the harmonically extremely rich, huge and mighty clean sounds of the Dumblelands and Steel String Singers. So maybe this is the ultimate and for sure the most versatile Dumble amp. You can't imagine a tonal color that cannot be achieved with this wonderful musical instrument. There is a signal path diagram of this amplifier on page 730 of the 4th edition of "The Tube Amp Book" by Aspen Pittman.

Preamp tubes specified by Mr. Dumble are 6 x 7025, 1 x 7247, 1 x 5751
Poweramp tubes specified by Mr. Dumble are 4 x 6550 or 4 x KT88


The amplifier is in excellent condition according to the standards of the "Vintage Guitar Magazine Price Guide". Electronics are 100 % original, and the preamp isn't covered with silicone. So service would be easy, if ever necessary.

The amplifier was used on at least a weekly base, so all capacitors are still working fine and you can hardly see any AC-ripple on a scope.

Gruß und schönen Sonntag
Angefügte Bilder:
BlueToneGuitar Offline

Beiträge: 1.035
Punkte: 1.035

25.11.2007 11:52
#2 RE: Dumble Zitat · Antworten
Meine Antwort dazu:

Die spinnen die A......... ! Natürlich ist der Dumble ein sehr guter Amp aber die Bauteile
sind auch bei diesem Teil innen nicht aus Gold und Edelsteinen gefertigt.

Übrigens: Wer auf den Dumble Sound steht sollte sich einmal nach Acoustic G60T oder G100T umsehen.
Daran eine 2 x 12" EV Box anschließen und den Sound auf sich wirken lassen. Da diese Teile, aus den
ca. 80ern, auch ein wenig Vintage sind respektive werden kosten sie auch ein wenig. Unter ca. 2000,- Euro
kann man aber noch dabei sein. Auch die neueren Fuchs Amps versprechen den Dumble Sound.

Sprachlos .......

Arc Angel Offline

Beiträge: 135
Punkte: 135

26.11.2007 17:45
#3 RE: Dumble Zitat · Antworten

Hi Folkes,

....Dumble!? Ich brauche so´n Ding nicht! *****I Like old Marshalls, the real coole Stuff!!!****

Gruss and Rock the Blues Thomas

Angefügte Bilder:
2Marshall JTM-45 MK-II 1964.jpg  
KlausK Offline

Beiträge: 47
Punkte: 47

28.11.2007 18:12
#4 RE: Dumble Zitat · Antworten

ja es gibt erstaunliche Preise. Ähnlich wie bei den sog. Vintage-Instrumenten. Ich denke, das sind einfach Sammlerobjekte (vergleichbar Antiquitäten oder Kunstwerken wie Bildern etc.), für die die Nachfrage höher ist, als das Angebot.
Wer will da schon beurteilen, welcher Preis angemessen ist? Was soll da der Maßstab sein? Letztlich sind solche Teile soviel Wert, wie irgendwer bereit ist, dafür zu zahlen.
Gruß, Klaus

BlueToneGuitar Offline

Beiträge: 1.035
Punkte: 1.035

28.11.2007 18:19
#5 RE: Dumble Zitat · Antworten

....... geiler Amp Thomas, hätte ich auch gerne !


Arc Angel Offline

Beiträge: 135
Punkte: 135

29.11.2007 13:42
#6 RE: Dumble Zitat · Antworten

Letztlich sind solche Teile soviel Wert, wie irgendwer bereit ist, dafür zu zahlen. >>> genauso ist das!!!

Ja Danke Dietmar,

dieser Marshall Amp ist der Hammer!

Gruss and Rock the Blues Thomas*


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