Search found 44 matches

by synthchaser
Tue May 21, 2019 10:44 pm
Forum: HELP!
Topic: ARP Odyssey 2800 No Audio
Replies: 12
Views: 2632

Re: ARP Odyssey 2800 No Audio

Don't buy the 3080s or any parts for that matter on eBay. See if Jameco or some reputable seller still has any. If all else fails, I have a high quality replacement submodule on my site...
by synthchaser
Fri May 10, 2019 5:48 am
Forum: HELP!
Topic: ARP Odyssey 2800 No Audio
Replies: 12
Views: 2632

Re: ARP Odyssey 2800 No Audio

Assuming you can't scope out the filter in a test circuit, you might consider testing the JFETs out of circuit before you try replacing the OTAs.
by synthchaser
Sun May 05, 2019 11:12 pm
Forum: HELP!
Topic: ARP Odyssey 2800 No Audio
Replies: 12
Views: 2632

Re: ARP Odyssey 2800 No Audio

by synthchaser
Sun May 05, 2019 3:16 am
Forum: HELP!
Topic: ARP Odyssey 2800 No Audio
Replies: 12
Views: 2632

Re: ARP Odyssey 2800 No Audio

Check out my video:



LM301 is the most common failure in them. I'm working on 4 Odysseys in parallel now, two have the 4023 and both of them are bad and need to be excavated and repaired. You won't need to buy a replacement clone.
by synthchaser
Sun Mar 10, 2019 5:01 am
Forum: General Synthesizers
Topic: How many oscillators?
Replies: 5
Views: 2767

Re: How many oscillators?

Unless it's a Chroma where you can configure it to have 16 voices with 1 oscillator each or 8 voices with 2 oscillators each. :)
by synthchaser
Sat Mar 09, 2019 5:01 am
Forum: General Synthesizers
Topic: Modern alternative to Arp Omni 2
Replies: 5
Views: 3062

Re: Modern alternative to Arp Omni 2

Since original Omni 2s are difficult to come by are there any modern hardware alternatives to the Omni 2? I've got a bunch of Omni 2's, and I make them reliable! If you're interested in the real deal, hit me up on my website. Oh? can't you find them under "Synthesizers" on your site... I've not got...
by synthchaser
Fri Mar 08, 2019 2:36 am
Forum: General Synthesizers
Topic: Modern alternative to Arp Omni 2
Replies: 5
Views: 3062

Re: Modern alternative to Arp Omni 2

unknownid wrote:Since original Omni 2s are difficult to come by are there any modern hardware alternatives to the Omni 2?
I've got a bunch of Omni 2's, and I make them reliable! If you're interested in the real deal, hit me up on my website.
by synthchaser
Tue Feb 05, 2019 11:25 pm
Forum: General Synthesizers
Topic: Sequential Circuits Six Trak with a few problems
Replies: 1
Views: 1222

Re: Sequential Circuits Six Trak with a few problems

You'll probably need an oscilloscope to get anywhere with it.
by synthchaser
Sat Nov 03, 2018 6:10 am
Forum: General Synthesizers
Topic: ARP Explorer
Replies: 5
Views: 3095

Re: ARE Explorer

I bought the one listed at 595 OBO and have one other I've been waiting to get around to restoring. It's not working right and needs a restoration. There are really 3 values... Parts/repair like the comps you were shown. Used/100% working, and restored. I'd expect a used/working Explorer I to be aro...
by synthchaser
Mon Sep 24, 2018 12:09 am
Forum: HELP!
Topic: Oberheim OB-Xa noise generator problem
Replies: 2
Views: 3209

Re: Oberheim OB-Xa noise generator problem

MPS5172 is the same as 2N5172 which is still available. 2N3904 should also work but it has a different pinout (EBC vs ECB).
by synthchaser
Sun Aug 05, 2018 12:12 am
Forum: General Synthesizers
Topic: Inside the World's Worst Juno 106
Replies: 2
Views: 1667

Inside the World's Worst Juno 106

"Inside the World's Worst Juno 106" photo album on facebook

https://www.facebook.com/media/set/?set ... 705&type=3
by synthchaser
Fri Jul 13, 2018 5:51 am
Forum: General Synthesizers
Topic: What's a good price to pay for a Jupiter 8 these days?
Replies: 13
Views: 3045

Re: What's a good price to pay for a Jupiter 8 these days?

Good for who? The buyer or the seller? :)
by synthchaser
Sat Jun 16, 2018 12:45 am
Forum: HELP!
Topic: Micromoog trimpots replacement
Replies: 6
Views: 2961

Re: Micromoog trimpots replacement

In general, I find that when a trimmer gets old, the carbon track gets damaged (indented, maybe?) where the wiper has been parked for years. Then you go to make a slight adjustment and you have erratic behavior close to the old parking spot of the wiper.
by synthchaser
Tue Feb 27, 2018 11:06 pm
Forum: General Synthesizers
Topic: How does a ladder filter work?
Replies: 3
Views: 2375

Re: How does a ladder filter work?

I'd recommend reading the active filter cookbook by Don Lancaster. A great book that covers active (transistor-based) filters in detail.
by synthchaser
Sat Jan 06, 2018 4:01 am
Forum: HELP!
Topic: Oberheim OB-8 Resonance Issue
Replies: 7
Views: 3442

Re: Oberheim OB-8 Resonance Issue

First I'd check the resonance control voltage, ahead of R349 (33k resistor going to pin 9 of the curtis chip) and see if it moves with your resonance knob and matches the voltage on the other voices. Just to be sure. Next you might try swapping U305 and U307 with a neighboring voice. Of everything i...