Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

His guitar slung across his back, his dusty boots is his cadillac.

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JerryPbury
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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by JerryPbury » Sun Dec 03, 2017 10:44 pm

I just bought 4 of those 2N525’s on eBay. Low hfe 30-49. I’m going to try something else.

Jerry

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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by daveweyer » Thu Dec 07, 2017 12:41 am

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.

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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by daveweyer » Thu Dec 21, 2017 10:27 pm

What, no Christmas stories of your latest amp mod, latest fuzz design, Wah mods, or cool Hendrixy stuff?

Tek465b
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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by Tek465b » Fri Dec 22, 2017 11:04 am

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.

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Xplorer
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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by Xplorer » Fri Dec 22, 2017 7:49 pm

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 ?

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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by daveweyer » Mon Dec 25, 2017 1:29 am

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.

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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by niknik » Mon Jan 01, 2018 6:38 pm

daveweyer wrote:
Mon Dec 25, 2017 1:29 am
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.
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 :D
Happy and rock 2018 to everybody! :toast:
Sammy who?!

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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by Tek465b » Tue Jan 09, 2018 10:09 pm

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:
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.

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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by Tek465b » Wed Jan 10, 2018 2:07 pm

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.

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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by Tek465b » Wed Jan 10, 2018 3:23 pm

double post

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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by Xplorer » Wed Jan 10, 2018 4:38 pm

interesting project !!! :)

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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by daveweyer » Wed Jan 10, 2018 7:18 pm

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........

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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by Xplorer » Wed Jan 10, 2018 7:55 pm

ha ha ! no, we don't give up on you, i'm just curious and excited to the idea of playing it ;)

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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by Roe » Thu Jan 11, 2018 9:44 am

I'd also love to get a pcb and can paypal money
http://www.myspace.com/20bonesband" onclick="window.open(this.href);return false;
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Super 100 amps: 1202-119 & 1202-84
JTM45 RS OT JTM50 JMP50 1959/2203/34/39

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Re: Jimi Hendrix' Gear and Mods at West Coast Organ and Amp

Post by shakti » Thu Jan 11, 2018 3:43 pm

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

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