What brand/model is the one you are using?
Search found 13148 matches
- Fri Apr 26, 2024 12:33 pm
- Forum: Dumble Discussion
- Topic: Starting to populate the chassis....
- Replies: 100
- Views: 3414
- Fri Apr 26, 2024 11:30 am
- Forum: Dumble Discussion
- Topic: The Much Anticipated (?) Bluesmaster Build Thread
- Replies: 4
- Views: 132
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: 4
- Views: 132
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: 2698
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: 2698
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: 2698
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: 2698
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: 2698
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: 24
- Views: 713
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: 429
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: 498
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: 2698
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: 170
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...
- Wed Apr 24, 2024 12:49 pm
- Forum: Dumble Discussion
- Topic: Bluesmaster HRM question:
- Replies: 90
- Views: 2698
Re: Bluesmaster HRM question:
As far as the lift resistance goes - 22M and 72k seem pretty far apart. What’s the best way to figure out where to start that experimentation? Higher value lifts more of the stack? 22M is the full lift, same as open circuit for all practical purposes. I've seen various values for the partial lift, ...