Search found 13025 matches
- Thu Mar 28, 2024 10:30 am
- Forum: Marshall Discussion
- Topic: 2204 build voltages are off
- Replies: 9
- Views: 238
Re: 2204 build voltages are off
Why are you going around measuring voltages without all the tubes installed ? You won't get any accurate measurements, that mean anything, that way I think no-load voltage at the reservoir is a good piece of information when starting up a new build, and it's the first thing I look at, usually long ...
- Wed Mar 27, 2024 1:03 am
- Forum: Dumble Discussion
- Topic: New Project
- Replies: 26
- Views: 679
Re: New Project
Wow, time flies! I think 'll stick with 6V6. You're right EL84 has very low drive voltage requirement.
- Tue Mar 26, 2024 8:55 pm
- Forum: Dumble Discussion
- Topic: New Project
- Replies: 26
- Views: 679
Re: New Project
Thanks, Rog. So EL84 was your preference over 6V6? Was it a close call? I could be persuaded to switch, if that's the hands-down best tone. Planning for 6V6, my plate voltage is going to be quite a bit higher than Matt used, however. What primary impedance did you use?
- Tue Mar 26, 2024 4:57 pm
- Forum: Dumble Discussion
- Topic: New Project
- Replies: 26
- Views: 679
- Tue Mar 26, 2024 4:26 pm
- Forum: Dumble Discussion
- Topic: Signal resistor type
- Replies: 6
- Views: 259
Re: Signal resistor type
I smell them. KOA's smell strongly of crushed gravel, where the Dale's have a volcanic ash note ;^)
- Tue Mar 26, 2024 2:50 pm
- Forum: Dumble Discussion
- Topic: Bluesmaster HRM question:
- Replies: 10
- Views: 302
Re: Bluesmaster HRM question:
Taper is about where in the rotation you get a given percentage of resistance, and also describes the change in percentage per degree along the way, which makes a significant difference in the usability of the control. An extreme case would be a linear volume pot, which results in a high volume leve...
- Tue Mar 26, 2024 11:53 am
- Forum: Dumble Discussion
- Topic: 3rd Gen started
- Replies: 82
- Views: 6399
Re: 3rd Gen started
All good questions. Recent production does not even have the outer foil bar on the label.
- Tue Mar 26, 2024 11:14 am
- Forum: Marshall Discussion
- Topic: 2204 build voltages are off
- Replies: 9
- Views: 238
- Tue Mar 26, 2024 10:48 am
- Forum: Dumble Discussion
- Topic: 3rd Gen started
- Replies: 82
- Views: 6399
Re: 3rd Gen started
In the photos, is the orientation indicated by a mark added by the builder, or a factory label, which is likely to be random in orientation?
- Tue Mar 26, 2024 10:45 am
- Forum: Technical Discussion
- Topic: Knight 600 valve emissions tester thoughts?
- Replies: 5
- Views: 126
- Tue Mar 26, 2024 10:32 am
- Forum: Technical Discussion
- Topic: Flash seen from bottom of 12AT7 PI socket
- Replies: 22
- Views: 448
Re: Flash seen from bottom of 12AT7 PI socket
Heater flash from video linked by Mark in Knight emissions tester post: https://youtu.be/SMHS1DNS8FA?t=169
- Mon Mar 25, 2024 8:44 pm
- Forum: Dumble Discussion
- Topic: New Project
- Replies: 26
- Views: 679
Re: New Project
No problem, it's all good input! Sounds good, too. Interesting you had success with a 6L6, what with its need for more drive voltage than an EL84 or 6V6.
- Mon Mar 25, 2024 7:45 pm
- Forum: Dumble Discussion
- Topic: New Project
- Replies: 26
- Views: 679
Re: New Project
Excellent! I had forgotten all about that. I have the schematic Colossal drew up, which has some good ideas. Matt drives an EL84 directly, where I'm planning on a 6V6. I want to ditch the preamp out/power amp in, and take a line out from the output transformer. That will be driving either a resistiv...
- Mon Mar 25, 2024 10:23 am
- Forum: Dumble Discussion
- Topic: New Project
- Replies: 26
- Views: 679
Re: New Project
The 20/20 must be pretty crowded inside, maybe a bit hard to work on? My project is a single ended amp, so no PI. I don't know if I'll miss it since the Dumble power amp is pretty much a clean Hi-Fi type. It's a bit of an experiment, so I'll just have to see how it turns out. The preamp is a copy of...
- Sun Mar 24, 2024 9:22 pm
- Forum: Dumble Discussion
- Topic: New Project
- Replies: 26
- Views: 679
Re: New Project
Yes! With built-in resistive load and pseudo-balanced line out.