Dumble modified Fender Vibrolux Reverb
Moderators: pompeiisneaks, Colossal
Dumble modified Fender Vibrolux Reverb
https://reverb.com/item/68691026-dumble ... ring-49502
Belonged to Dennis Herris
DUMBLE MODS:
The Vibrato Channel 2 Input is now a 6-position stepped rotary knob presence/frequency control
The Vibrato Channel Volume is now a push-pull Overdrive Engage and Preamp Control. (Rotate knob for more or less distortion)
The Vibrato "Intensity" knob is now a Master Volume.
The Vibrato "Intensity" control has now been re-located to the back panel of the amp.
Reverb control is disengaged in favor of the preamp/master volume circuit.
Belonged to Dennis Herris
DUMBLE MODS:
The Vibrato Channel 2 Input is now a 6-position stepped rotary knob presence/frequency control
The Vibrato Channel Volume is now a push-pull Overdrive Engage and Preamp Control. (Rotate knob for more or less distortion)
The Vibrato "Intensity" knob is now a Master Volume.
The Vibrato "Intensity" control has now been re-located to the back panel of the amp.
Reverb control is disengaged in favor of the preamp/master volume circuit.
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Re: Dumble modified Fender Vibrolux Reverb
nothing special inside, few dralorics and one el.cap in nfb, where is HADs work?
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Re: Dumble modified Fender Vibrolux Reverb
DUMBLE MODS:
The Vibrato Channel 2 Input is now a 6-position stepped rotary knob presence/frequency control
The Vibrato Channel Volume is now a push-pull Overdrive Engage and Preamp Control. (Rotate knob for more or less distortion)
The Vibrato "Intensity" knob is now a Master Volume.
The Vibrato "Intensity" control has now been re-located to the back panel of the amp.
Reverb control is disengaged in favor of the preamp/master volume circuit.
The Vibrato Channel 2 Input is now a 6-position stepped rotary knob presence/frequency control
The Vibrato Channel Volume is now a push-pull Overdrive Engage and Preamp Control. (Rotate knob for more or less distortion)
The Vibrato "Intensity" knob is now a Master Volume.
The Vibrato "Intensity" control has now been re-located to the back panel of the amp.
Reverb control is disengaged in favor of the preamp/master volume circuit.
Re: Dumble modified Fender Vibrolux Reverb
yes i read, still nothing, + reverb part was the best part.
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Re: Dumble modified Fender Vibrolux Reverb
If bepone modifies my amp , but doesn’t install new parts, does that mean bepone didn’t mod my amp?
…that shielded cable looks familiar…rotary switch assembly looks clean …
Last edited by WhopperPlate on Sat May 06, 2023 6:12 pm, edited 3 times in total.
Charlie
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Re: Dumble modified Fender Vibrolux Reverb
Looks like a type 3 Ken fisher master volume
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Charlie
Re: Dumble modified Fender Vibrolux Reverb
i was speaking that there is no value for listed price...maybe is if divided by 20-ish IMOWhopperPlate wrote: ↑Sat May 06, 2023 5:40 pmIf bepone modifies my amp , but doesn’t install new parts, does that mean bepone didn’t mod my amp?
…that shielded cable looks familiar…rotary switch assembly looks clean …
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Re: Dumble modified Fender Vibrolux Reverb
At this point …if Dumble touched it then its value is justified … whether we like it or notbepone wrote: ↑Mon May 08, 2023 12:48 pmi was speaking that there is no value for listed price...maybe is if divided by 20-ish IMOWhopperPlate wrote: ↑Sat May 06, 2023 5:40 pmIf bepone modifies my amp , but doesn’t install new parts, does that mean bepone didn’t mod my amp?
…that shielded cable looks familiar…rotary switch assembly looks clean …
Charlie
Re: Dumble modified Fender Vibrolux Reverb
A vid of this amp emerged; interesting feature IMO is the rotary knob for the OD channel where sustain/feedback is adjustable! From 2.05-4.07.
Since we have a gut shot Im trying to figure out what is going on with the green wire at the OD entrance and that particular rotary switch..
Someone got a idea?
Since we have a gut shot Im trying to figure out what is going on with the green wire at the OD entrance and that particular rotary switch..
Someone got a idea?
Re: Dumble modified Fender Vibrolux Reverb
It looks like Reverb took down the listing. One can usually see old 'sold' listings. Not in this case.
Re: Dumble modified Fender Vibrolux Reverb
something is wrong with the sound on the video.. it is getting drops in volume, so i couldnt listen this bug for long time.
but it seeems that on the selector are different values of capacitors, probably coupling caps between the stages.. probably lower value is taken to not to cut buss so much, and on the other end it is adding more and more and more, which is not affected later in circuit like adding bass, it is like adding sustain only. probably bass is cut before PI with 500pf/1nF PI input capacitor
i will try one time a if is like this and see how it behaves
but it seeems that on the selector are different values of capacitors, probably coupling caps between the stages.. probably lower value is taken to not to cut buss so much, and on the other end it is adding more and more and more, which is not affected later in circuit like adding bass, it is like adding sustain only. probably bass is cut before PI with 500pf/1nF PI input capacitor
i will try one time a if is like this and see how it behaves
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Re: Dumble modified Fender Vibrolux Reverb
Capacitive divider is rotary. i say. Looks like pairs? I think.erwin_ve wrote: ↑Sat Jul 29, 2023 11:08 am A vid of this amp emerged; interesting feature IMO is the rotary knob for the OD channel where sustain/feedback is adjustable! From 2.05-4.07.
Since we have a gut shot Im trying to figure out what is going on with the green wire at the OD entrance and that particular rotary switch..
Someone got a idea?
They seem really excited about it. lol
Aha. Erwin, draw the front panel control layout and look at the PP switch on Vib Volume plus the Reverb control.
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
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Re: Dumble modified Fender Vibrolux Reverb
Reverb control is disengaged in favor of the preamp/master volume circuit.Reeltarded wrote: ↑Sun Jul 30, 2023 9:17 amCapacitive divider is rotary. i say. Looks like pairs? I think.erwin_ve wrote: ↑Sat Jul 29, 2023 11:08 am A vid of this amp emerged; interesting feature IMO is the rotary knob for the OD channel where sustain/feedback is adjustable! From 2.05-4.07.
Since we have a gut shot Im trying to figure out what is going on with the green wire at the OD entrance and that particular rotary switch..
Someone got a idea?
They seem really excited about it. lol
Aha. Erwin, draw the front panel control layout and look at the PP switch on Vib Volume plus the Reverb control.
Pp is to Engage the drive circuit. The rotary is close to the bright switch where no cap is visible on the pic.
I'm not familiar with the vibrolux at all, what do you mean with capacitive divider?
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Re: Dumble modified Fender Vibrolux Reverb
A capacitive divider is the 6 pos switch. I am almost positive. It is on the signal side of the circuit with no DC to block at this point. I have provided a link with full description of splitting AC with caps.
2 poles, 6 positions. I count 7 caps. The largest brown cap (at left side) is bridged all positions on A (signal) side of switch.
https://www.electronics-tutorials.ws/ca ... vider.html
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Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
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Re: Dumble modified Fender Vibrolux Reverb
Shit. That's tiny but readable.
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.