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What makes this pre-amp circuit tick ?
Can this JCM800 amp mod be considered the genesis of all Bogner's designs ?
Can this JCM800 amp mod be considered the genesis of all Bogner's designs ?
Right. Bogner built it as a pre-amp mod into a combo amp for Ron Champagne.I actually don’t know a lot about it. There are schematics out there I believe. Plate driven tone stack 4 stages is what I recall.
Is the one on Reverb legit ?https://reverb.com/item/48661867-19...100w-jcm-800-snorkler-vintage-alice-in-chainsRight. Bogner built it as a pre-amp mod into a combo amp for Ron Champagne.
Legend has it there were 2 others made, around that same time time period.
It was put in as a small, blue circuit board with two 12AX7's on it.
The price sure as hell is.Is the one on Reverb legit ?https://reverb.com/item/48661867-19...100w-jcm-800-snorkler-vintage-alice-in-chains
I'm thinking that goes along with some of the other Bogner discussions here, of late..I was reading the info about it in that link and what really caught me was when he said " it doesn't have that horrifying "modern" sound" lol.
Yeah. Dirt was 3~4 amps blended, also.The Rhythm sound on Facelift was a boosted Blackface Bassman; Butler Tube Driver. Out of R Champagnes mouth; here on the forum. Snorkeler was leads n cleans.
Through 70s greenbacks.
No need to blow 6K on a Bogner modded Marshall.
I'm thinking that goes along with some of the other Bogner discussions here, of late..
Where folks are seeking "older" Bogner designs for the very same reason.
I'm actually hoping to hear from @Fusionbear on this one, because I'm trying to learn something about it - being a novice at amp modding.
I managed to sketch the mod schematic from the hi-res photos of the "blue board".Bogner amps I'm not too familiar with. They just never did anything for me. I do respect his "mad professor" skills though. But, it's really just a matter of preference. The circuits are not hard, there isn't any magic going on. It's just different combinations of plate resistors, cathode resistors and caps, and coupling caps. Find a combo that works and play....
Yeah, that one pretty much agrees with what you see on the blue circuit boards.https://www.scribd.com/document/416098004/Bogner-Snorkler-Mod-Draft1
Found this online. While I’m not autistic enough to confirm the values they do look close to the ones in the above photos. Kinda hard to figure out what’s going on outside of the way the tone stack is configured. Perhaps a bunch of low end pre tone stack that gets shaved out by the slope and re-flavored middle and bass caps?
I have TUT vol 2, but I don't find that circuit in there.Looks similar to the TUT high gain mod that you also see almost verbatim in the Rocca's
I have 5 schematics at this point, including the ones from the snocone forum, and there are a few variations in how the tone stack is implemented.I also belive there are major tone stack changes. David Hopins knows the answers
See TUT4I have TUT vol 2, but I don't find that circuit in there.
I'm building it as a pre-amp inside an old amp chassis, rather than modding my JCM800.
Looking forward to hearing what this circuit sounds like !