Jimmy Page with his Hiwatt amplifier at the Royal Albert Hall, became an historical moment blessed by the Gods of tone.
(https://soundcubed.com/wp-content/uploads/2018/09/Royal-Albert-Hall-RAH-guitar-pedal-2-768x432.jpg)
(https://soundcubed.com/wp-content/uploads/2018/09/Royal-Albert-Hall-RAH-guitar-pedal-3-768x432.jpg)
(https://soundcubed.com/wp-content/uploads/2018/09/Royal-Albert-Hall-RAH-guitar-pedal-6-576x1024.jpg)
(https://soundcubed.com/wp-content/uploads/2019/09/set-RAH-768x441.jpg)
More at soundcubed.com/the-royal-albert-hall-with-a-footswitch/ (https://soundcubed.com/the-royal-albert-hall-with-a-footswitch/)
Nice work! How's it sound?
Damnn that looks sexy!
Where did you get the schematic and the pcb? Is it a kit? Or did you scratch build it?
Lewis
It's the Catalinbread RAH, it was traced here or at "the other forum"
See this,
https://www.diystompboxes.com/smfforum/index.php?topic=59911.0
mac
http://revolutiondeux.blogspot.com/2012/05/catalinbread-wiio-rah.html?m=1
http://tagboardeffects.blogspot.com/2012/04/catalinbread-rah.html?m=1
Thanks *mouth watering * this just might be my fall/winter project.
Cheers
Lewis
Quote from: Lew-Dawg on September 23, 2018, 02:19:31 PM
Damnn that looks sexy!
Where did you get the schematic and the pcb? Is it a kit? Or did you scratch build it?
Lewis
Hey man ,
Yes this a version of a schematic of the Catalinbread RAH.
I adapted a PCB to my needs using DIY LC, and etched a 1590BB enclosure.
Quote from: ElectricDruid on September 23, 2018, 06:54:49 AM
Nice work! How's it sound?
I think it sounds quite ok, but the EQ is insensitive.
The odd thing about that design it seems to me, is that it puts the tonestack within a negative feedback loop. Possibly that cancels some of the changes the tonestack makes? In the original amps, the tonestack is before the feedback which runs from speaker output transformer secondary back to the power stage phase splitter.
Maybe the schematic is wrong. Too many people here don't really care for detail. If it's "working" (somehow), it gets marked as "verified".
Could it be possible that the right side of R11 is connected to the wrong transistor?
(http://2.bp.blogspot.com/-bnlTjGc7DfM/T7zg-zA9OPI/AAAAAAAABW8/fXwHxSufzww/s1600/catalinbread+rah.PNG)
This is the Hiwatt amp:
http://1.bp.blogspot.com/-8r1nNLlYNkg/T7ziBfokAbI/AAAAAAAABXE/_KWcufdOzxE/s1600/DR_Pre2InputJP.gif
It would certainly be interesting to disconnect R11. The thing might spring to life. The circuit is too simple to simulate the original NFB scheme and presence feature.
Hey,
I added the schematic, PCB and enclosure transfer at the bottom of the page below:
https://soundcubed.com/the-royal-albert-hall-with-a-footswitch/ (https://soundcubed.com/the-royal-albert-hall-with-a-footswitch/)
Thanks. Should be able to slim this down to a 125B.
Quote from: bloxstompboxes on September 25, 2018, 09:01:29 AM
Thanks. Should be able to slim this down to a 125B.
I can share the DIYLC file if you want. :)
Quote from: MJ_Sound_Cubed on September 25, 2018, 03:58:54 PM
Quote from: bloxstompboxes on September 25, 2018, 09:01:29 AM
Thanks. Should be able to slim this down to a 125B.
I can share the DIYLC file if you want. :)
That would be awesome and save me a lot of time. You could put it in the DIYLC cloud if you like. I'm sure others would like that too.
I'll be front row if you decide to green light the project... Keep us posted!
Cheers
Lewis
Hi guys,
Its in the DIY LC cloud with the name "Royal Albert Hall by MJ".
Enjoy, and let me know about your mods. ;)
Quote from: Lew-Dawg on September 26, 2018, 12:23:03 PM
I'll be front row if you decide to green light the project... Keep us posted!
Cheers
Lewis
I forgot that DIYLC has an issue when used with Radeon HD graphic cards. I'll do a layout but in diptrace and then I'll post a build doc with toner transfers.
I built both the WIIO and RAH on vero a while back and was rather disappointed in the sounds from these circuits. Maybe there are problems with the schematics. Just last night, I decided to take a look at the RAH in LTSpice (even tracking down the BS170 spice model), and the tone stack definitely has issues and seems to be very interactive. However, the RAH does appear to have the correct 70s Hiwatt tone stack. Also, my LTSpice simulation showed no appreciable change in the response if you take out the feedback loop. Maybe there's some subtle effect there.
The MOSFET stages here are rather unique in design, but I think this could be recast using the "Box of Rock" type MOSFET stages and get a similar sound while using some version of the Hiwatt tonestack.
Still didnt try LT Spice, so cant comment on it. :)
Almost done with slimming this down. Won't be verified since I have such little time these days. I will eventually build it though, however, I'll post it here for anyone who wants to give it a go.
Well done :) Cant wait.
I remembered that I had an old laptop that I bought to play around with and it had no issues with running DIYLC. Albeit is a little slow with moving full blown layouts around the page. I redrew MJ's layout and kept it pretty close to the original as far as where everything was placed, with the exception of a few parts that had to be moved to better fit the size parameters. It should fit a 125B. It is currently not verified and I will update it if need be. It is on the cloud. Just search for Rah. Let me know here if there are any issues!
When printing, don't fit to page and dpi should be 600 I believe. Should all be on one page and just under 2.25in in width. Some traces are a little close, so be careful of solder bridges. You might need to run a blade between some pads and traces if printed on some older laser printers. I can stretch it down if needed. Let me know guys.
(https://imgur.com/L8qaet5.png)
Quote from: bloxstompboxes on September 30, 2018, 09:32:44 PM
I remembered that I had an old laptop that I bought to play around with and it had no issues with running DIYLC. Albeit is a little slow with moving full blown layouts around the page. I redrew MJ's layout and kept it pretty close to the original as far as where everything was placed, with the exception of a few parts that had to be moved to better fit the size parameters. It should fit a 125B. It is currently not verified and I will update it if need be. It is on the cloud. Just search for Rah. Let me know here if there are any issues!
When printing, don't fit to page and dpi should be 600 I believe. Should all be on one page and just under 2.25in in width. Some traces are a little close, so be careful of solder bridges. You might need to run a blade between some pads and traces if printed on some older laser printers. I can stretch it down if needed. Let me know guys.
(https://imgur.com/L8qaet5.png)
Well Done, Im impressed can you share the files as well?
Actually, the pots are too close together for board mounting both side by side and and vertically. The files are on the cloud though. I will make the necessary changes this week maybe. The board fits in a 1590B, BTW. Not sure 3 16mm pots with fit side by side though.
Found all kinds of value and ref des errors. Wait until I correct them. Sorry about the goofs.
Corrected version of the above layout can be found below and in the cloud:
https://imgur.com/CDEG6K3.png
Pots have yet to be moved. I will verify functionality of the circuit before doing that, most likely.
My schematic for my layout. MJ, FYI, I found your schematic was missing the protection diode and the connection from lug 3 to 2 on the bass pot.
(https://imgur.com/RsZS75E.jpg)
Quote from: bloxstompboxes on October 04, 2018, 05:13:41 PM
My schematic for my layout. MJ, FYI, I found your schematic was missing the protection diode and the connection from lug 3 to 2 on the bass pot.
(https://imgur.com/RsZS75E.jpg)
Hey man,
Thanks bro. :) Well done, Diptrace seems to be a good tool :) I will try to update my schematic as well.
Excuse the off-topic for a moment, but how do you do those circles for "+9V" and "In" and "Out", Eric? I use Diptrace all the time, but I've never seen those before - not that I'm a Diptrace power-user or anything. Are they in the libraries somewhere or did you add them?
Thanks,
Tom
Quote from: ElectricDruid on October 07, 2018, 11:40:03 AM
Excuse the off-topic for a moment, but how do you do those circles for "+9V" and "In" and "Out", Eric? I use Diptrace all the time, but I've never seen those before - not that I'm a Diptrace power-user or anything. Are they in the libraries somewhere or did you add them?
Thanks,
Tom
Hey Tom. No, I didn't do them myself. They are available in the Rullywow libraries under the 'supply pins' category, I think it was. I Not sure if my dropbox account is active on my home pc at the moment as I recently did a reinstall of everything from scratch. Somebody here had posted them in a thread. vigilante397 posted them a while back. Let me know if you can't get them, for whatever reason, and I'll post em up for you.
Should be here:
https://www.diystompboxes.com/smfforum/index.php?topic=113117.msg1046208#msg1046208
Quote from: Frank_NH on September 27, 2018, 10:10:01 AM
I built both the WIIO and RAH on vero a while back and was rather disappointed in the sounds from these circuits. Maybe there are problems with the schematics. Just last night, I decided to take a look at the RAH in LTSpice (even tracking down the BS170 spice model), and the tone stack definitely has issues and seems to be very interactive. However, the RAH does appear to have the correct 70s Hiwatt tone stack. Also, my LTSpice simulation showed no appreciable change in the response if you take out the feedback loop. Maybe there's some subtle effect there.
The MOSFET stages here are rather unique in design, but I think this could be recast using the "Box of Rock" type MOSFET stages and get a similar sound while using some version of the Hiwatt tonestack.
Any chance you can post the LT Spice file for our perusal, Frank? I'd like to mess with it, and if you've already got it set up, well.... ;) thanks, if you can.
Quote from: GibsonGM on October 08, 2018, 08:48:16 PM
Quote from: Frank_NH on September 27, 2018, 10:10:01 AM
I built both the WIIO and RAH on vero a while back and was rather disappointed in the sounds from these circuits. Maybe there are problems with the schematics. Just last night, I decided to take a look at the RAH in LTSpice (even tracking down the BS170 spice model), and the tone stack definitely has issues and seems to be very interactive. However, the RAH does appear to have the correct 70s Hiwatt tone stack. Also, my LTSpice simulation showed no appreciable change in the response if you take out the feedback loop. Maybe there's some subtle effect there.
The MOSFET stages here are rather unique in design, but I think this could be recast using the "Box of Rock" type MOSFET stages and get a similar sound while using some version of the Hiwatt tonestack.
Any chance you can post the LT Spice file for our perusal, Frank? I'd like to mess with it, and if you've already got it set up, well.... ;) thanks, if you can.
Hey GibsonGM,
Didn't see this request till now :P. How does one attach files to a reply? I don't see that option... Otherwise I could drop it in my Onedrive space and provide a link.
For anyone wanting to use mine, my layout is now verified. Just rocked it before boxing. The boxing part is gonna have to wait. I've got others in queue already. I'll try and get the pot spacing fixed later this week though.
Interesting circuit.