The Amp Garage

Max wrote: IMO the serial number of a Dumble amp was usually fitted to its chassis before the installation of its circuit. So IMO - especially in regard to the rare Dumble amps (ODR, SSS, Dumbleland, etc) - there's only a rather loose correlation between the serial number and the date of completion...

Tony Wrote: (if you can) describe what it is you are hearing between these resistors you prefer. Things like frequency response harmonic content or character of overdrive (distortion) enhance sustain etc etc. If you could possibly help direct my ears to how these resistors influence the amps timbre...

Tony wrote: Yes, this is the JB/Vito ODSR. However, these are not the Tantalum caps I was referring to in my previous post. The ones I was wondering about were the early solid-electrolyte 150D Spragues shown here and in my Music man?.. These smaller Taints used like in 58 were also widely used by (...

Tony Wrote:Now we have :wink: Hello Tony, That's the JB/Vito #0058? Correct...the picture is burry but yes, you can clearly see tantalum cathode bypass capacitors installed. An interesting choice...I can honestly say I never considered using a Tantalum in place of a traditional aluminum electrolyti...

Max Wrote: AFAIR these are female EIAJ Circular 10-pin audio/video connectors, e.g. used for connecting a professional video camera with a professional video recorder.Max Thanks Max...very interesting! That looks to be very close (if not) the exact part on #0121 and likely the other two amps too. R...

Max Wrote: Hi Gabe, it's female: ODR #0057 - back.jpg Here's the same female XLR on the back of OD-120WR #0137: ODR #0137 - back.JPG So perhaps the footswitch of ODR #0057 engages/disengages OD, PB, Reverb (just like the footswitch of ODR #0137)? BTW: The same female XLR is on the back of ODS 150W ...

Max Wrote: IMO - based on the pictures of ODR #0057 posted here: ("Dumble #0057 - Santana") http://thesubjectmatter.com/dumblearchive.html - at least the chassis of ODR #0057 and the chassis of ODR #0060 look rather similar. So why do you think, that their layouts/circuits are very different ( ... ...

Max Wrote:Your personal opinion (AFAIU): At the very beginning - IYO in the mid to late 70ies - ODR #0060 started its life in an unmodified empty 3rd generation style (toggle switches) ODR chassis with a circuit and with parts (Centralab 500KL treble pot, Piher carbon film resistors e. g.) I never ...

Max Wrote: IMO we only know for sure, that the current look of the chassis of ODR #0060 is most similar to the look of a "transition generation" ODS chassis. And I have strong doubts, that the chassis of ODR #0060 started its life as a chassis prepared for sliding switches similar to a 2nd generati...

Tony Wrote: Hello GPD..I agree! Dumbles attention to detail in his parts selection to achieve a sound and reliability is IMO a big part of his genius nobody else of the time caught on to or paid much attention to in electric guitar amplification. He was ahead of the curve on multiple fronts. When y...

Max Wrote:IMO the term "generation" doesn't make much sense in regard to Dumble amps with OD and with reverb, and/or tremolo, and/or 150W etc. Max, well, considering the use of "generation" to classify Dumble products originated by individuals other than Dumble...I think it is possible to correlate...

Tony Wrote: Here is what I know of ODSR #0060. It is an interesting beast. Cap codes say 78 so it may have started out as a 3rd generation later upgraded to a 4th generation Skyliner with some modifications (Max might know) It has RGU59 throughout as well as Q-line (draloric) in the path and a few ...

...and these. :wink: CW ATTACHMENTS RN65D105K.jpg Charlie, Those are definitely "Hens Teeth" in the wild :D 105K with a 1981 date code...many Dumble fanatics and audiophiles alike would be frothing at the opportunity to get their hands on those. I find it interesting that HAD migrated to the milita...

Tony Wrote: Like these? Iskra/Draloric/Phier/Dales/ NTE's/IRC/ all in 1 amp I've seen these pix previously and honestly, I'm suprised HAD didn't use Iskra's more often. I've seen him use the CDE Brown Drops in the polarity splitter on other amps...Iskra's...not so much. What is the serial number of...

Tony/Charile, Great observation regarding the 100K Dale's found in the Low-Plate amps... Of those 1970's amps I've seen in person, they are indeed always the 18th week of 1975. He obviously bought himself a stash of these in the 1970's :D The construction of these is a bit different by the time the ...