Now, don't laugh... PowerPoint. I've done faceplates with it too, just need to save as .pdf.
My take on a 2nd Gen ODS
Moderators: pompeiisneaks, Colossal
- martin manning
- Posts: 13355
- Joined: Sun Jul 06, 2008 12:43 am
- Location: 39°06' N 84°30' W
Re: My take on a 2nd Gen ODS
No judgment from me since I still use Microsoft Paint for most things!martin manning wrote: ↑Tue May 07, 2024 3:45 pmNow, don't laugh... PowerPoint. I've done faceplates with it too, just need to save as .pdf.
I do need to look at Powerpoint now. There are some faceplate ideas for other projects I've been kicking around I would love to try sometime!
Matt J.
Re: My take on a 2nd Gen ODS
There is a bit of a learning curve, but a combo of inkscape (think Illustrator) and gimpshop (think Photoshop) have served me well for graphics, face plates, pedals, logos, etc. They are open source and free. Can do pretty much anything you might want.Matt J wrote: ↑Tue May 07, 2024 4:10 pmNo judgment from me since I still use Microsoft Paint for most things!martin manning wrote: ↑Tue May 07, 2024 3:45 pmNow, don't laugh... PowerPoint. I've done faceplates with it too, just need to save as .pdf.
I do need to look at Powerpoint now. There are some faceplate ideas for other projects I've been kicking around I would love to try sometime!
Matt J.
-Dan
Re: My take on a 2nd Gen ODS
BTW - I'm cleaning up some wiring and double checking some of the connections. While I'm in there with my soldering iron I would like to address the issue of not getting enough negative bias voltage. Which resistor should I adjust first? The 3.9k on the board, or the 27k running from the bias pot lug to ground?
Currently I'm only getting about -43 max negative DC voltage and cannot go lower than 63mA when trying to bias, which is way to hot for these 6L6GCs.
Matt J.
Currently I'm only getting about -43 max negative DC voltage and cannot go lower than 63mA when trying to bias, which is way to hot for these 6L6GCs.
Matt J.
- martin manning
- Posts: 13355
- Joined: Sun Jul 06, 2008 12:43 am
- Location: 39°06' N 84°30' W
1 others liked this
Re: My take on a 2nd Gen ODS
I recommend adjusting the 3k9. Start by clipping or tacking another 3k9 across the one that's there and see where that gets you.
Re: My take on a 2nd Gen ODS
Update: It's alive!martin manning wrote: ↑Tue May 07, 2024 11:39 pm I recommend adjusting the 3k9. Start by clipping or tacking another 3k9 across the one that's there and see where that gets you.
Well, sort of.... Dropping the 3.9k down to 1k gave me enough negative voltage to bias the 6L6GCs at about ~38mA at 440 VDC plate voltage. I rewired some of the preamp and may have cleared out an error grounding out the preamp I just could not find at first. The amp will now produce sound, but it is intermittent and will cut out. Preamp switches and tone stack work, so does the PAB, but switching on the OD causes the signal to cut out completely. I'm going to try to roll some tubes and just keep digging from there.
Matt J.
You do not have the required permissions to view the files attached to this post.
Re: My take on a 2nd Gen ODS
I've rolled several tubes but keep getting the same result, OD goes in and out, then out completely.
I'm starting to suspect I have an error in the relay wiring. The PAB is working fine, but I would appreciate another set of eyes on the OD relay board I'm using from Taylor at AN.
From left to right:
Shielded cable with the black heat shrink connects to the Master Volume.
Green wire feeds into the 220k OD entrance.
Grey wire feeds out from the clean 10nf coupling cap.
Ground connection follows next.
Shielded cable with the green heat shrink leads to the wiper of the OD Volume pot.
Matt J.
I'm starting to suspect I have an error in the relay wiring. The PAB is working fine, but I would appreciate another set of eyes on the OD relay board I'm using from Taylor at AN.
From left to right:
Shielded cable with the black heat shrink connects to the Master Volume.
Green wire feeds into the 220k OD entrance.
Grey wire feeds out from the clean 10nf coupling cap.
Ground connection follows next.
Shielded cable with the green heat shrink leads to the wiper of the OD Volume pot.
Matt J.
You do not have the required permissions to view the files attached to this post.
Re: My take on a 2nd Gen ODS
Something I noticed and am curious about. The green wire goes to the 220k OD entrance, then to a 33k then to OD1 input. The junction of the resistors is tied to ground on the layout. Is this really supposed to be grounded? With it grounded the signal is only passed by the 1m2 resistor.
Glenn
I solder better than I play.
I solder better than I play.
Re: My take on a 2nd Gen ODS
Found a Gen 3 schematic and it matches the layout.
Glenn
I solder better than I play.
I solder better than I play.
Re: My take on a 2nd Gen ODS
I believe your channel relay is wired like the traditional 2nd Gen, but needs to be wired like a bluesmaster since you have the hybrid setup with independent channel master volumes. Check Martin's board PDF in files and follow the bluesmaster connections.Matt J wrote: ↑Wed May 08, 2024 2:50 am I've rolled several tubes but keep getting the same result, OD goes in and out, then out completely.
I'm starting to suspect I have an error in the relay wiring. The PAB is working fine, but I would appreciate another set of eyes on the OD relay board I'm using from Taylor at AN.
From left to right:
Shielded cable with the black heat shrink connects to the Master Volume.
Green wire feeds into the 220k OD entrance.
Grey wire feeds out from the clean 10nf coupling cap.
Ground connection follows next.
Shielded cable with the green heat shrink leads to the wiper of the OD Volume pot.
Matt J.
-Dan
Re: My take on a 2nd Gen ODS
Thanks Dan!dbharris wrote: ↑Wed May 08, 2024 11:34 amI believe your channel relay is wired like the traditional 2nd Gen, but needs to be wired like a bluesmaster since you have the hybrid setup with independent channel master volumes. Check Martin's board PDF in files and follow the bluesmaster connections.Matt J wrote: ↑Wed May 08, 2024 2:50 am I've rolled several tubes but keep getting the same result, OD goes in and out, then out completely.
I'm starting to suspect I have an error in the relay wiring. The PAB is working fine, but I would appreciate another set of eyes on the OD relay board I'm using from Taylor at AN.
From left to right:
Shielded cable with the black heat shrink connects to the Master Volume.
Green wire feeds into the 220k OD entrance.
Grey wire feeds out from the clean 10nf coupling cap.
Ground connection follows next.
Shielded cable with the green heat shrink leads to the wiper of the OD Volume pot.
Matt J.
-Dan
I had thought about going that direction, but wanted it instead to be more like 102, 124, and 183 with an OD ratio control and single master. I may revisit that though.
Matt J.
Re: My take on a 2nd Gen ODS
Sorry I misunderstood! Good luck tracking it down.
Re: My take on a 2nd Gen ODS
The more I have thought over, the more I am leaning towards changing it to have the separate masters for OD and Clean.
The design I have seen the most for this is in the attached PDF.
I have two questions on this;
1. Why is the clean master not connected to the ground bus? The outer (brown in this drawing) wire runs to COM 2 which, from Martin's relay layouts, should just have the OD entrance running to it.
2. Is there any benefit to switching from the 2nd Gen Deep Switch to the to the version from the 4th/5th eras as this design does? From trying it when this amp would work, I was not that impressed with the 2nd Gen's function.
Matt J.
The design I have seen the most for this is in the attached PDF.
I have two questions on this;
1. Why is the clean master not connected to the ground bus? The outer (brown in this drawing) wire runs to COM 2 which, from Martin's relay layouts, should just have the OD entrance running to it.
2. Is there any benefit to switching from the 2nd Gen Deep Switch to the to the version from the 4th/5th eras as this design does? From trying it when this amp would work, I was not that impressed with the 2nd Gen's function.
Matt J.
You do not have the required permissions to view the files attached to this post.