stratcat62 wrote:Just something I saw that made me curious. In the current issue of Fretboard Journal magazine there's a great interview of David Lindley done by Ben Harper. There are pictures of both of his ODS amps, #2 and #8 I believe. Instead of the Rock/Jazz switch, they both had Mic/Guitar switches. Does anyone know anything about these? It would seem to lend credence to the idea of Lindley's Dumble being a 'bigger, louder version of a Deluxe'.
Hi stratcat62,
for my ears the "Guitar/Mic" switches on early ODS allways had the same function as the "Rock/Jazz" switch on the later ones.
stratcat62 wrote:Just something I saw that made me curious. In the current issue of Fretboard Journal magazine there's a great interview of David Lindley done by Ben Harper. There are pictures of both of his ODS amps, #2 and #8 I believe. Instead of the Rock/Jazz switch, they both had Mic/Guitar switches. Does anyone know anything about these? It would seem to lend credence to the idea of Lindley's Dumble being a 'bigger, louder version of a Deluxe'.
Hi stratcat62,
for my ears the "Guitar/Mic" switches on early ODS allways had the same function as the "Rock/Jazz" switch on the later ones.
Greetings
Max
Another source showing this is one of the Dumble schematic PDF's on schematicheaven. Have fun!
mike9 wrote:I know the #40 is famous because it's degooped. I acquired a '59 Bassman reissue that's been built into a head and Jim Price at Omega gutted and did a build based on the #40 Dumble circuit. Basically he kept the tranny's and the chassis. It's running KT66's and is a very aggressive sounding amp - he upgraded it for me and tweaked the clean channel and the drive channel is incredible.
The control layout is Presence, Clean master volume, OD master volume, OD gain, Bass, Mid, Treble and Preamp volume. Runs a three button foot switch with Preamp Boost, Mid Boost and Channel switch. It also has a switch for Pentode and Triode use and a bright switch.
It's a great sounding amp - I'm running it into an EV SRO/12 in an oversized open back cab. Just curious what the early Dumbles sound like. Can anyone point me towards some clips?
Hi Mike,
as far as I know most of the "silverface" ODS don't have the goop from the start. So there is no need to degoop them. Some of them later got the goop sometimes in the eighties when an update (e. g. "Skyliner") was made.
I took the pictures of #40 with a cheesy Sony Mavica camera 8-9 years ago, and also played through it. Guess I should have watermarked the pix back then - LOL
To me, it sounded similar to a Mk I Boogie. The filter caps were pretty hammered in the amp, and it needed new tubes in the worst way, the two 6L6's were not even of the same manufacturer. It would have been nice to hear it with new caps and tubes.
BTW, there was never any goop on the circuit board.
I could have bought the amp for $10k, who would have known at the time what they would be going for nowdays? Oh well.
BTW, when I first put those pix up years ago, I got a few not-so-friendly emails from friends of Mr. Dumble requesting I take the pix down.
I think you're right Max. I'm pretty sure what Schematic Heaven calls, "60's ODS" is not and ODS but a Small Special 100.
Two inputs: check
guitar/mic switch: check
No overdrive stages: check
4 rectifier diodes: check
27K tail on bias pot: check
1.5K/25uF on Cathodes of both pre's: check
2.2K/10K dropping string: check (60's shows 2.9K and 11K. Close enough)
I really think we're seeing a schematic to a Small Special 100 not a "60's ODS"
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