Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
Moderators: VelvetGeorge, BUG
-
- New Member
- Posts: 1
- Joined: Tue Oct 24, 2017 5:36 pm
- Just the numbers in order: 13492
Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
I just bought 4 of those 2N525’s on eBay. Low hfe 30-49. I’m going to try something else.
Jerry
Jerry
-
- Senior Member
- Posts: 713
- Joined: Wed Oct 29, 2014 9:36 pm
- Just the numbers in order: 13492
Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
Tek,
The little chassis the circuit was in had a 26 volt power transformer; I dropped the voltage to 9 for the fuzz circuit, and then used the 26 volt supply to provide 12 volts for the reed relay, just a resistor in series.
The biasing was from way back in the West Coast days; on the circuit I tried to reconstruct for Xplorer and Shakti I forgot how I originally did it. After I found the original one I made for Jimi, I carefully copied it--that's the latest schematic that Xplorer posted, and the one which is now in the museum.
It's all rather primitive, I decided to use a different DC feedback path than the AC path so you could adjust the parameters independently, hence the two feedback systems. Obviously, with using all PNP transistors, I had to use a zener diode to get the DC bias voltage in the right range, and hope the temp stability would be reasonable.
I guess no really good sources of inexpensive 2N591s out there?
If anyone could find an older analog Allen organ that a church was junking, they would have hundreds of 2N591s to choose from, all higher beta too--300 transistors in an average unit.
The little chassis the circuit was in had a 26 volt power transformer; I dropped the voltage to 9 for the fuzz circuit, and then used the 26 volt supply to provide 12 volts for the reed relay, just a resistor in series.
The biasing was from way back in the West Coast days; on the circuit I tried to reconstruct for Xplorer and Shakti I forgot how I originally did it. After I found the original one I made for Jimi, I carefully copied it--that's the latest schematic that Xplorer posted, and the one which is now in the museum.
It's all rather primitive, I decided to use a different DC feedback path than the AC path so you could adjust the parameters independently, hence the two feedback systems. Obviously, with using all PNP transistors, I had to use a zener diode to get the DC bias voltage in the right range, and hope the temp stability would be reasonable.
I guess no really good sources of inexpensive 2N591s out there?
If anyone could find an older analog Allen organ that a church was junking, they would have hundreds of 2N591s to choose from, all higher beta too--300 transistors in an average unit.
-
- Senior Member
- Posts: 713
- Joined: Wed Oct 29, 2014 9:36 pm
- Just the numbers in order: 13492
Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
What, no Christmas stories of your latest amp mod, latest fuzz design, Wah mods, or cool Hendrixy stuff?
-
- Senior Member
- Posts: 207
- Joined: Sat Jan 10, 2015 9:43 am
- Just the numbers in order: 13492
- Contact:
Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
Me?, oh well.. lost my dog last month, and latelly am more sick.
Had to go to the ER, i need to pass some more medical test i may have something bad in the colon(Hopefully not cancer :O).
And this stupid Meniere disease that make me dizzy, it feel like the purple haze song.. dont know if am going up or down... yadayada.
Anyway i made a website and a c sharp windows app: https://tek465b.github.io/
Will work on the Fuzz PCB soon.
Had to go to the ER, i need to pass some more medical test i may have something bad in the colon(Hopefully not cancer :O).
And this stupid Meniere disease that make me dizzy, it feel like the purple haze song.. dont know if am going up or down... yadayada.
Anyway i made a website and a c sharp windows app: https://tek465b.github.io/
Will work on the Fuzz PCB soon.
- Xplorer
- Senior Member
- Posts: 2471
- Joined: Sun Apr 19, 2009 5:27 pm
- Just the numbers in order: 7
Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
Oh, sorry for your dog and health problems, i wish you good things to happen Tek !
Merry Christmas everyone !! Yes, the forum is a bit down lately, is it me or time flys too fast and our minds are focused so much on work ? damn.
Nothing special on my side, but i endly have an extra room that will become my workshop. i'll make it neat and clean. Then i'll can work in a proper environment on some amps and effects that are waiting since too long !
And in the other room i'll build myself some wooden furnitures, some kind of consoles to put all the racks, amps, synths etc, it'll be clean and comfy to play and record some music
What are the other news from everyone ?
Merry Christmas everyone !! Yes, the forum is a bit down lately, is it me or time flys too fast and our minds are focused so much on work ? damn.
Nothing special on my side, but i endly have an extra room that will become my workshop. i'll make it neat and clean. Then i'll can work in a proper environment on some amps and effects that are waiting since too long !
And in the other room i'll build myself some wooden furnitures, some kind of consoles to put all the racks, amps, synths etc, it'll be clean and comfy to play and record some music
What are the other news from everyone ?
-
- Senior Member
- Posts: 713
- Joined: Wed Oct 29, 2014 9:36 pm
- Just the numbers in order: 13492
Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
I'm working on a Marshall Major mod. I'll have the pics and details here soon, almost done. Some circuit changes you might like.
Merry Christmas for all those who do that, happy Solstice for the light lovers.
Merry Christmas for all those who do that, happy Solstice for the light lovers.
-
- Senior Member
- Posts: 82
- Joined: Sun Jan 14, 2007 11:54 am
Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
Dave,
This is very intriguing!
I've just built a sort of little Major, with just 2 kt88, an original Dynaco A-431-70 ot, and a new P782 S Power Transformer from Triode.
It's a lot different from all the Marshalls I have experienced, very powerful but also a very clean amp, definitely a different beast.,
My strato seems huge with this boy.
A new journey for this new year
Happy and rock 2018 to everybody!
Sammy who?!
-
- Senior Member
- Posts: 207
- Joined: Sat Jan 10, 2015 9:43 am
- Just the numbers in order: 13492
- Contact:
Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
Made some progress on the schematic and PCB. its 5cm by 5cm to fit in a 1590B enclosure
Gonna order some pcb and component soon
PCB image:
Schematic image:
https://www.mediafire.com/convkey/ee40/ ... fwl36g.jpg
Gonna order some pcb and component soon
PCB image:
Schematic image:
https://www.mediafire.com/convkey/ee40/ ... fwl36g.jpg
Last edited by Tek465b on Wed Jan 10, 2018 3:25 pm, edited 2 times in total.
-
- Senior Member
- Posts: 207
- Joined: Sat Jan 10, 2015 9:43 am
- Just the numbers in order: 13492
- Contact:
Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
There we go, order placed for 10 pcb
Last edited by Tek465b on Wed Jan 10, 2018 6:40 pm, edited 1 time in total.
-
- Senior Member
- Posts: 207
- Joined: Sat Jan 10, 2015 9:43 am
- Just the numbers in order: 13492
- Contact:
- Xplorer
- Senior Member
- Posts: 2471
- Joined: Sun Apr 19, 2009 5:27 pm
- Just the numbers in order: 7
Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
interesting project !!!
-
- Senior Member
- Posts: 713
- Joined: Wed Oct 29, 2014 9:36 pm
- Just the numbers in order: 13492
Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
Tek, it looks real exciting. Maybe I can get a couple of PCBs from you to finish the projects for Shakti and Xplorer--they've been waiting a long time for me to get some time to work on their units and are probably about to give up on me.
Just a note on using the zener to get DC feedback; I had to fiddle around with a few, and think I ended up with the zener and a regular rectifier diode in series to get the perfect voltage drop. You know it's real fussy and responds only within the range of voltages I listed on the schematic.
I may be able to find some NOS 2N591s for you to use........
Just a note on using the zener to get DC feedback; I had to fiddle around with a few, and think I ended up with the zener and a regular rectifier diode in series to get the perfect voltage drop. You know it's real fussy and responds only within the range of voltages I listed on the schematic.
I may be able to find some NOS 2N591s for you to use........
- Xplorer
- Senior Member
- Posts: 2471
- Joined: Sun Apr 19, 2009 5:27 pm
- Just the numbers in order: 7
Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
ha ha ! no, we don't give up on you, i'm just curious and excited to the idea of playing it
-
- Senior Member
- Posts: 5054
- Joined: Thu Apr 13, 2006 1:36 pm
- Just the numbers in order: 7
- Location: Drontheim. Norwegen
- Contact:
Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
I'd also love to get a pcb and can paypal money
http://www.myspace.com/20bonesband" onclick="window.open(this.href);return false;
http://www.myspace.com/prostitutes" onclick="window.open(this.href);return false;
Super 100 amps: 1202-119 & 1202-84
JTM45 RS OT JTM50 JMP50 1959/2203/34/39
http://www.myspace.com/prostitutes" onclick="window.open(this.href);return false;
Super 100 amps: 1202-119 & 1202-84
JTM45 RS OT JTM50 JMP50 1959/2203/34/39
-
- Senior Member
- Posts: 2053
- Joined: Tue Apr 05, 2005 9:06 am
- Just the numbers in order: 7
- Location: Ramnes, Norway
Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp
I am ready whenever you are, Dave!
JTM45 RS OT, 1973 18W, JTM45/100, JTM50, JMP50 1986, JMP100 "West Coast", AC15, AC30, BF Super Reverb, Boogie Mk 1, Hiwatt CP103, DR103