Search found 13250 matches
- Fri May 17, 2024 3:43 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3180
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 ...
- Thu May 16, 2024 10:51 pm
- Forum: Technical Discussion
- Topic: Taming amp gain in single channel deluxe reverb build
- Replies: 55
- Views: 1972
Re: Taming amp gain in single channel deluxe reverb build
Great! looking forward to seeing photos and maybe a sound clip.
- Thu May 16, 2024 10:48 pm
- Forum: Dumble Discussion
- Topic: The Much Anticipated (?) Bluesmaster Build Thread
- Replies: 76
- Views: 2199
Re: The Much Anticipated (?) Bluesmaster Build Thread
Good to hear you figured it out. Note in the Bluesmaster layout the switches shown are slide types, but the lug connections are shown as they would be for toggle switches.
- Thu May 16, 2024 10:17 pm
- Forum: Dumble Discussion
- Topic: Starting to populate the chassis....
- Replies: 114
- Views: 5448
Re: Starting to populate the chassis....
So I have a question. Using this board and this transformer The AC bias tap should be 60VAC, transformer puts out 45vac. Is this enough voltage or do I need to do something different to get 60 volts? Just have to reduce the 3k9 resistor to something smaller, maybe 470 ohms or so. Correction, 47 to ...
- Thu May 16, 2024 9:27 pm
- Forum: Dumble Discussion
- Topic: Starting to populate the chassis....
- Replies: 114
- Views: 5448
Re: Starting to populate the chassis....
Just have to reduce the 3k9 resistor to something smaller, maybe 470 ohms or so.
- Thu May 16, 2024 8:30 pm
- Forum: Dumble Discussion
- Topic: The Much Anticipated (?) Bluesmaster Build Thread
- Replies: 76
- Views: 2199
Re: The Much Anticipated (?) Bluesmaster Build Thread
Do you mean the OT primary connections/NFB?Raoul Duke wrote: ↑Thu May 16, 2024 8:02 pm Not hearing any weird noise from the PI or OT, so I guess V3b plate wire is ok where it is for now?
- Thu May 16, 2024 8:03 pm
- Forum: Technical Discussion
- Topic: Can I Parallel 2 Mosfets in VVR?
- Replies: 27
- Views: 594
Re: Can I Parallel 2 Mosfets in VVR?
It's the same as placing two same-value resistors in series to reduce voltage instead of one at the same total resistance. In the case of two resistors, half of the voltage is dropped in each one, current is the same, so half the power (V*I) is dissipated in each.
- Thu May 16, 2024 3:48 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 72
- Views: 3180
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...
- Thu May 16, 2024 10:57 am
- Forum: Technical Discussion
- Topic: Can I Parallel 2 Mosfets in VVR?
- Replies: 27
- Views: 594
Re: Can I Parallel 2 Mosfets in VVR?
At very low voltage the current draw is reduced. Power is I^2R, and the reduction in I^2 becomes dominant.Kagliostro wrote: ↑Thu May 16, 2024 9:01 am but I'm not able to figure why at 1/3 of the voltage as output the dissipation will not ne high
- Wed May 15, 2024 6:28 pm
- Forum: Dumble Discussion
- Topic: Robben Ford & His Dumble Overdrive Special
- Replies: 23
- Views: 920
Re: Robben Ford & His Dumble Overdrive Special
I see it has the pro tour option, 12 chassis mounting bolts ;^)
- Wed May 15, 2024 2:16 pm
- Forum: Dumble Discussion
- Topic: The Much Anticipated (?) Bluesmaster Build Thread
- Replies: 76
- Views: 2199
Re: The Much Anticipated (?) Bluesmaster Build Thread
Yea, sorry for the diversion. If you went ahead and wired the rest of it up you'd have been fine. Hopefully the learning was worth the trip!
- Wed May 15, 2024 2:04 pm
- Forum: Dumble Discussion
- Topic: The Much Anticipated (?) Bluesmaster Build Thread
- Replies: 76
- Views: 2199
Re: The Much Anticipated (?) Bluesmaster Build Thread
That's it. I seem to recall the same question coming up in your 102 build.Raoul Duke wrote: ↑Wed May 15, 2024 2:00 pmMakes sense - the second ground reference wasn’t in the circuit - so it compensated by pushing all the voltage to one (grounded) side. Do I understand that correctly?
- Wed May 15, 2024 1:54 pm
- Forum: Dumble Discussion
- Topic: The Much Anticipated (?) Bluesmaster Build Thread
- Replies: 76
- Views: 2199
Re: The Much Anticipated (?) Bluesmaster Build Thread
Do you have heater leads connected between the two sockets? If not that would explain it. I thought I saw a back/white twisted pair.
- Wed May 15, 2024 1:45 pm
- Forum: Dumble Discussion
- Topic: The Much Anticipated (?) Bluesmaster Build Thread
- Replies: 76
- Views: 2199
Re: The Much Anticipated (?) Bluesmaster Build Thread
That says that the 150R from 2 isn't connected to ground.
- Wed May 15, 2024 1:24 pm
- Forum: Dumble Discussion
- Topic: The Much Anticipated (?) Bluesmaster Build Thread
- Replies: 76
- Views: 2199
Re: The Much Anticipated (?) Bluesmaster Build Thread
Yes. If you disconnect the PT heater leads you should measure ~150R to ground from pins 7 and 2. There are two diodes and a resistor across those pins, but that shouldn't affect the measurement significantly. P.S. If you measure pin 2 or 7 to ground with the heater leads connected, you should see ~7...