HF Taper Jibba Jabba

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dogears
Posts: 1902
Joined: Wed Feb 01, 2006 1:29 pm

Re: HF Taper Jibba Jabba

Post by dogears »

Read my post. 123 is not a treble bleed IMHO. It is a loading circuit because 123 had the OD feeding the 1M master with no ratio pot.
greiswig wrote:
Jonas wrote:(SNIP)
It is my understanding that the corner frequency is then 14.5Hz for HAD's and 636.9Hz for Gil's. (SNIP)
This is a treble bleed with a knee that low??? I'm confused. It must have a very low slope!

Is there a schematic somewhere that shows these with common values in a Dumble?
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greiswig
Posts: 1002
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Location: Oregon

Re: HF Taper Jibba Jabba

Post by greiswig »

dogears wrote:Read my post. 123 is not a treble bleed IMHO. It is a loading circuit because 123 had the OD feeding the 1M master with no ratio pot.
greiswig wrote:
Jonas wrote:(SNIP)
It is my understanding that the corner frequency is then 14.5Hz for HAD's and 636.9Hz for Gil's. (SNIP)
This is a treble bleed with a knee that low??? I'm confused. It must have a very low slope!

Is there a schematic somewhere that shows these with common values in a Dumble?
Gracias!
-g
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Funkalicousgroove
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Re: HF Taper Jibba Jabba

Post by Funkalicousgroove »

tubedogsmith wrote:
Funkalicousgroove wrote:The control on the amp I have here is labelled "Overdrive Presence" and uses a 500K pot, and a .0039uf cap to ground
It looks like it has another resistor going to ground off the board too doesn't it?
there is no ratio control on the old ones, there is a 100K to ground, and a 1M in series to form the "Ratio" divider.
Owner/Solder Jockey Bludotone Amp Works
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groovtubin
Posts: 1114
Joined: Tue Feb 07, 2006 4:52 am

Re: HF Taper Jibba Jabba

Post by groovtubin »

Funkalicousgroove wrote:The control on the amp I have here is labelled "Overdrive Presence" and uses a 500K pot, and a .0039uf cap to ground
Randall Smith prob patented that, as that is same for a few older boogies in design!

jp
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chris_sanford
Posts: 131
Joined: Wed Feb 14, 2007 6:47 pm
Location: Portland, OR

Re: HF Taper Jibba Jabba

Post by chris_sanford »

groovtubin wrote:
Funkalicousgroove wrote:The control on the amp I have here is labelled "Overdrive Presence" and uses a 500K pot, and a .0039uf cap to ground
Randall Smith prob patented that, as that is same for a few older boogies in design!
Just because Smith/Boogie has patented something doesn't necessarily mean that they originally came up with that something. To wit, Dumble was making channel-switching amps well before MB came out with the MKII... and look who has the patent on that one?

Or, perhaps that was your point? :)

chris
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groovtubin
Posts: 1114
Joined: Tue Feb 07, 2006 4:52 am

Re: HF Taper Jibba Jabba

Post by groovtubin »

chris_sanford wrote:
groovtubin wrote:
Funkalicousgroove wrote:The control on the amp I have here is labelled "Overdrive Presence" and uses a 500K pot, and a .0039uf cap to ground
Randall Smith prob patented that, as that is same for a few older boogies in design!
Just because Smith/Boogie has patented something doesn't necessarily mean that they originally came up with that something. To wit, Dumble was making channel-switching amps well before MB came out with the MKII... and look who has the patent on that one?

Or, perhaps that was your point? :)

chris
my middle name is facetious...you are quite right! I`m hopin the only reason he does that is to feed his family for light years ahead! lol!
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