Search found 13149 matches
- Fri Apr 26, 2024 4:28 pm
- Forum: Dumble Discussion
- Topic: The Much Anticipated (?) Bluesmaster Build Thread
- Replies: 7
- Views: 147
Re: The Much Anticipated (?) Bluesmaster Build Thread
HAD used different relay PCB's for the OD and PAB, which seems silly when a generic board can be used for either. The connections in the boards .pdf use the universal relay PCB shown there, or you can use the C/NC/NO references to use any other DPDT relay board.
- Fri Apr 26, 2024 12:33 pm
- Forum: Dumble Discussion
- Topic: Starting to populate the chassis....
- Replies: 100
- Views: 3427
- Fri Apr 26, 2024 11:30 am
- Forum: Dumble Discussion
- Topic: The Much Anticipated (?) Bluesmaster Build Thread
- Replies: 7
- Views: 147
Re: The Much Anticipated (?) Bluesmaster Build Thread
You might consider adding a link in your 102 build thread to its follow-up impressions thread too.
- Fri Apr 26, 2024 10:05 am
- Forum: Dumble Discussion
- Topic: The Much Anticipated (?) Bluesmaster Build Thread
- Replies: 7
- Views: 147
Re: The Much Anticipated (?) Bluesmaster Build Thread
I hope my build threads are helpful to those who want to try but have no background in this... The Q&A leading up to this (six pages) is useful too, and it will get lost if it's not linked: https://ampgarage.com/forum/viewtopic.php?p=464413#p464413 The main filter board looks great! I think this is...
- Thu Apr 25, 2024 11:03 pm
- Forum: Dumble Discussion
- Topic: Bluesmaster HRM question:
- Replies: 90
- Views: 2702
Re: Bluesmaster HRM question:
If you are likely to be around 50-100k, I would say go for a 500k trimmer. 10-20% of rotation for the partial boost, and 500k is only about 1 dB down from full lift.
- Thu Apr 25, 2024 10:28 pm
- Forum: Dumble Discussion
- Topic: Bluesmaster HRM question:
- Replies: 90
- Views: 2702
Re: Bluesmaster HRM question:
If you are looking at my boards .pdf, you're correct, it uses Com2-NC2 as the path to ground. The layout shows the other set of contacts being used to open the mid pot wiper-CW short, which will have no effect on the PAB if the ground is lifted 22M. Interestingly, if a partial lift is used, then set...
- Thu Apr 25, 2024 9:26 pm
- Forum: Dumble Discussion
- Topic: Bluesmaster HRM question:
- Replies: 90
- Views: 2702
Re: Bluesmaster HRM question:
Yes. You wire the pot as a variable resistor, and when the relay contacts are open it becomes the resistance to ground. If the trimmer is on the bus then there are two ground paths.Raoul Duke wrote: ↑Thu Apr 25, 2024 9:10 pm So put the trimmer connecting Com1 and NC1 - one side and wiper?
- Thu Apr 25, 2024 8:50 pm
- Forum: Dumble Discussion
- Topic: Bluesmaster HRM question:
- Replies: 90
- Views: 2702
Re: Bluesmaster HRM question:
The biggest mistake I made when I first started building these amps however many years ago was to try to outwit Dumble with "tweaks" instead of trying to understand his original design intention. It's an urge that I have difficulty with to this day.....but I am working hard not to succumb! To concl...
- Thu Apr 25, 2024 1:00 pm
- Forum: Dumble Discussion
- Topic: Bluesmaster HRM question:
- Replies: 90
- Views: 2702
Re: Bluesmaster HRM question:
Yes! Thanks Erwin. Clever way to add that feature.
- Thu Apr 25, 2024 12:51 pm
- Forum: Garage Talk
- Topic: Stirs Neural pot
- Replies: 26
- Views: 735
Re: Stirs Neural pot
This is one of the laws of thermodynamics.
- Thu Apr 25, 2024 12:13 pm
- Forum: Dumble Discussion
- Topic: Bonamassa new amp day
- Replies: 18
- Views: 736
- Thu Apr 25, 2024 11:39 am
- Forum: Dumble Discussion
- Topic: Dumble ODS 102 build
- Replies: 15
- Views: 430
Re: Dumble ODS 102 build
Sometimes the difference is subtle, so I prefer using a DMM or scope to get a quantitative measurement.Guitarman18 wrote: ↑Wed Apr 24, 2024 6:10 pm This is a really simple and effective way to find the outer foil of your caps.
- Thu Apr 25, 2024 11:10 am
- Forum: Technical Discussion
- Topic: Blackvibe 6L6 Strange behavior on tone pots
- Replies: 17
- Views: 499
Re: Blackvibe 6L6 Strange behavior on tone pots
Thanks for the update. Makes sense.retodellatorre wrote: ↑Thu Apr 25, 2024 8:07 am So i changed the middle pot to a A 10K and removed the 6.8k to ground (just ground)... ... So i replaced the 0.047uf with a 0.022uf - and there we go.
- Thu Apr 25, 2024 10:52 am
- Forum: Dumble Discussion
- Topic: Bluesmaster HRM question:
- Replies: 90
- Views: 2702
Re: Bluesmaster HRM question:
Did Dumble actually do this or is it just another TAG tweak? Excuse me, just another TAG tweak? ;^) I seem to recall seeing a picture of this. It may have been in a HAD amp or maybe it was a mod by one of the commercial D clone builders. Does this mean the full 22M has a negative effect or that it’...
- Wed Apr 24, 2024 5:54 pm
- Forum: Technical Discussion
- Topic: Tone Stack Bypass RAW control
- Replies: 4
- Views: 171
Re: Tone Stack Bypass RAW control
Yes, it's a pot. The switch doesn't remove it from the circuit, just makes it go to the full 1Meg while preserving the setting. Alternatively, a switch in series with the pot could be used to open the bypass circuit and completely remove it, but it would be a good idea to put a large resistor across...