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caleyskinner
Jul 09, 2023
In Show us your builds!
Hi all, Just thougth id share a few photos of my build. Transformers, chassis and faceplate were from Tube Town. I Also made the cabinet myselft from scratch, First time using tolex too! The speaker im using is a Warehouse guitars ET-65. The amp itself sounds great, combined with the speaker its quite bright and articlate. Hopefully will sound great in a band setting. I also ran a 500pf cap across the NFB resistor and used the spare trim pots on the back to adjust the level to take off a bit of high end if required. I got this idea from Rob Robinettes "Ice pick cap" as the stock presence circuit has little effect. Only thing i regret not doing is soldering in a base for the relay so if one failed i could remove and plug in another, cause if oner failed ill have to lift the board. I was also advised by my local tech to switch the live mains volatge rather than the neutral as it is on the layouts, Perhaps something to think about if youre on my side of the world to comply with local standards. The cut out on the lower half of the head is going to be for a dumbleator which im halfway through building. Cheers for New Zealand!
Dumble 3rd Gen Build content media
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caleyskinner
May 21, 2023
In Troubleshooting
Hi all, im having an issue with ghost notes. When playing high notes the amp creates another tone lower and sounds dissonant. Ive tried different speakers, guitars, new sets of tubes, changing lead dress, different bias, raising pcb, placing sheilds between transformers, chopsticking components with no change. The strange notes/harmonics are present when plugging into the pre-amp return so this would mean its an issue with the power section? Ive also increased capacitance in the power supply thinking i may have ripple. ive gone through and checked all values and wiring. ive also built several amps before this one with no issues so i doubt its a soldering issue(could be wrong though). I see one other member has the same issue as me in the frugal amps post if that means anything. Any help would be greatly appreciated.
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caleyskinner
Apr 22, 2023
In PCBs and general enquiries
Hi All, I've just completed the 3rd gen dumble build. Ive got a low end oscillation when turning on the standby switch which lasts for a second or two. Have others experienced this and if so how did you fix it? to my untrained ears it may be flyback voltage from the choke?
[SOLVED] Dumble ODS Oscillation  content media
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caleyskinner
Feb 21, 2023
In PCBs and general enquiries
Hi all, Has anyone found a suitable transformer to build this dumbleator on 230V 50Hz mains supply? Thanks from New Zealand!
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caleyskinner
Sep 02, 2022
In PCBs and general enquiries
Hi All, just wondering what transformers you guys are using for the 3rd gen 50W build? I see Tube town have some but would like to have other options or equivalents i could use. Thanks!
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caleyskinner

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