Search found 414 matches
- Fri May 17, 2024 4:28 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3174
Re: 2nd Gen Build
Seemed like I had a better balance between the channels too but that required maxing out the volume and keeping overdrive around 50%. Was a low dB test though and may not be reflective of normal playing levels. More fun later tonight after work.... I ran a simulation including source impedance for ...
- Fri May 17, 2024 1:43 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3174
Re: 2nd Gen Build
Forgot to pay the "tax" with an updated gut shot: PXL_20240517_023439314.jpg Your tone controls should work now! Forgot to pay the "tax" with an updated gut shot: PXL_20240517_023439314.jpg Any difference in the tone stack? Yes, had a quick test this morning. Treble and middle function as expected ...
- Fri May 17, 2024 10:53 am
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3174
Re: 2nd Gen Build
Forgot to pay the "tax" with an updated gut shot:
- Fri May 17, 2024 2:45 am
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3174
Re: 2nd Gen Build
Thinking about this more and running some numbers here is what I've come up with. Voltage dividers are linear (though a pot may have a different taper) meaning if you think of the divider as attenuating a certain percentage of signal voltage, it does not matter if that input is 10V or 50V, the rati...
- Fri May 17, 2024 2:36 am
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3174
Re: 2nd Gen Build
Hey Dan, Regarding your tone stack being underwhelming, check your slope resistor. You have a 100R instead of a 100K. Credit goes to Jelle for spotting it :D Thank you Ian and Jelle! I will get that swapped out before any other changes. You guys are awesome! -Dan Swapped in the proper slope resisto...
- Thu May 16, 2024 11:02 am
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3174
Re: 2nd Gen Build
Thank you Ian and Jelle! I will get that swapped out before any other changes. You guys are awesome!ijedouglas wrote: ↑Thu May 16, 2024 2:53 am Hey Dan,
Regarding your tone stack being underwhelming, check your slope resistor. You have a 100R instead of a 100K.
Credit goes to Jelle for spotting it
-Dan
- Wed May 15, 2024 6:30 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3174
Re: 2nd Gen Build
Thinking about this more and running some numbers here is what I've come up with. Voltage dividers are linear (though a pot may have a different taper) meaning if you think of the divider as attenuating a certain percentage of signal voltage, it does not matter if that input is 10V or 50V, the ratio...
- Tue May 14, 2024 5:21 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3174
Re: 2nd Gen Build
My thought was keep the load similar to the Second Gen to preserve its character, and allow some plus/minus on the level coming out of the OD wrt the fixed divider in the Second Gen layout. The main point is, however you do it, the Ratio control provides for adjustment of the OD output without goin...
- Tue May 14, 2024 3:30 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3174
Re: 2nd Gen Build
Thanks, Martin. Bear with me for a minute because I'm just a tax lawyer and the theory and math side of EE is not my strong suit. I think what Martin is suggesting would be to add a typical 4th/5th Gen ratio control. In all of the Dumble designs I am familiar with there is a series resistor there (i...
- Tue May 14, 2024 1:53 am
- Forum: Dumble Discussion
- Topic: Robben Ford & His Dumble Overdrive Special
- Replies: 23
- Views: 919
Re: Robben Ford & His Dumble Overdrive Special
Here is a video of him playing the amp live back in 1988. I believe that is his dumbleator sitting on top of it. I noticed the amp did sounded a little darker here with the dumbleator. It still sounds amazing!! I wonder if the ageing of the components over time also changed the sound of the amp. ht...
- Sun May 12, 2024 7:12 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3174
Re: 2nd Gen Build
FET is sorted and sounds good. At some point in testing yesterday, I realized my standby switch was wired incorrectly (essentially like there was no switch in circuit). I easily found the mistake, but for the life of me could not see where the OT CT, choke, and standby were supposed to be tied toge...
- Sun May 12, 2024 7:09 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3174
Re: 2nd Gen Build
FET is sorted and sounds good. At some point in testing yesterday, I realized my standby switch was wired incorrectly (essentially like there was no switch in circuit). I easily found the mistake, but for the life of me could not see where the OT CT, choke, and standby were supposed to be tied toge...
- Sun May 12, 2024 6:57 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3174
Re: 2nd Gen Build
I had to pull it and replace with an NTE 452. The J201 wouldn't bias, I think the drain resistor probably needed to be adjusted too. At least for that J201.Stephen1966 wrote: ↑Sun May 12, 2024 1:06 pm How is that J201 sounding? Does it or the circuit do anything to raise the sound floor?
-Dan
- Sun May 12, 2024 11:45 am
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3174
Re: 2nd Gen Build
FET is sorted and sounds good. At some point in testing yesterday, I realized my standby switch was wired incorrectly (essentially like there was no switch in circuit). I easily found the mistake, but for the life of me could not see where the OT CT, choke, and standby were supposed to be tied toget...
- Sat May 11, 2024 5:14 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3174
Re: 2nd Gen Build
New FET biased up easy. I set it for just under 3 for the Vdd/Vd ratio. It sounds good, but the volume is lower than the normal channel even with the FET trimmer wide open. I may bring the ratio closer to 2.5 and see if that helps. What are the voltages at the top and bottom of the drain resistor? ...