Dumble Overdrive reverb Gut shot, well kinda........

[boldaslove6789]

Check it out:


http://www.premierguitar.com/Magazine/I ... 100WR.aspx

[David Root]

Verrrry interestink!! Tough to make out the serial # but my guess is 0018, which is in the right time frame I think, for the original build. # 13 was an ODSR.

[boldaslove6789]

Jackson Browne Owned this sweet little peach. The article says Alexander lived with Browne when this amp was built. The cab belonged to Bonnie Raitt

the two were joined up and sold to the current owner.

For reference purposes here what the article says if the link doesn't work:

"The preamp circuit most likely began as (what’s known in internet circles) the “classic” preamp. This is based on other OD circuits built around the same time period. What we do know is that it does not have the classic pre in it now. Poring over my own notes and schematics as well as speaking with colleagues that have had experience with these circuits over the years, we decided that it probably has a very early version of the “skyline” pre, though the tone stack more closely resembles one of earlier examples. Could this be the first incarnation of this now famous design? The plate load resistors are not the earlier “low plate classic” design but a surprisingly current array. Some pretty interesting stuff going on in here."

The overall signal path is as follows:

Clean gain (Volume) > tone controls > the other gain stage > clean master Ratio (located on back) > two OD stages’ Gain and Level on front > OD Ratio (on back, tones are mostly bypassed in OD mode) > Reverb > Clean/Wet summing stage before the phase inverter, which is different from Fender circuits.

[talbany]

Judging by the description possibly a
Transition Silverface ODSR" (starting around '79/'80) and with most specs more or less close to the first "blackface" amps.. ratio, trigger trim pot, "classic" tonestack and some other specs like 3 tube reverb mix done before the OD circuit as in 2nd and possibly 3rd generation ODSR's.. Judging from the description the amp was later upgraded to skyliner specs w/ higher plates (although it looks to have the early style Mepcos) Coax looks to be Radioshack RGU/59

Perhaps Just the Fax Max can clerify..

Tony

[Max]

Judging by the description possibly a
Transition Silverface ODSR" (starting around '79/'80) and with most specs more or less close to the first "blackface" amps.. ratio, trigger trim pot, "classic" tonestack and some other specs like 3 tube reverb mix done before the OD circuit as in 2nd and possibly 3rd generation ODSR's.. Judging from the description the amp was later upgraded to skyliner specs w/ higher plates (although it looks to have the early style Mepcos) Coax looks to be Radioshack RGU/59

Perhaps Just the Fax Max can clerify..

Tony

Hi Tony, Happy New Year!

Yes, transition generation "classic" ODR - trigger and dynamic balance trim pots are obvious (so no funky OD entrance like in #13). Updated with a skyline tone stack - the skyline bass pot capacitor is obvious in the gut shot and the treble capacitor on the board does not seem to be the usual "classic" ceramic disc but the "skyline" 6PS. Transition generation "classic" coax is indeed always Tandy if not removed as a part of a skyline update (like in #124.).

AFAIR what Make'N'once told about this amp (many many years ago) it was indeed often updated by Alexander Dumble over the years - see the white teflon coax (running to one of the ratios?) - and so in some details it will probably be an unusual special beast - like the Farris amp - but the Farris tone stack always stayed a "classic" in all its updates.

But AFAIR these transition generation "classic" ODRs do no longer mix the reverb in front of the OD - like the 2nd generation ODR #13 as an example - but do the mix like in #121. Series # of this ODR is in the range of the Farris amp AFAIR what Make'N' once has told. When it was with Make'N' it was still in its original head cabinet AFAIR. Would be interesting to know what happened to the Bonnie Raitt ODR for which this Bonnie Raitt combo cabinet has originally been made for. Does someone here know?

All the best,

Max

[talbany]

Max...Happy New Year Back!!
Thanks for clarifying and elaborating... Looking forward to more of your posts in the new year..

Be Well!!

Tony