Search found 408 matches

by Dr. Phibes
Fri Jun 19, 2015 9:17 pm
Forum: General Synthesizers
Topic: Polymoog 203A Restoration - You Got to Love Spaghetti!!
Replies: 30
Views: 7548

Re: Polymoog 203A Restoration - You Got to Love Spaghetti!!

You will find many other synths and outboard of the era have the same thing. Indeed I have. I guessed it had something to do with their perceived reliability, I just wish they were more... consistent. Seems like when I'm fault finding it's always the chip that isn't socketed :evil: Check out an Emu...
by Dr. Phibes
Fri Jun 19, 2015 3:51 am
Forum: General Synthesizers
Topic: Polymoog 203A Restoration - You Got to Love Spaghetti!!
Replies: 30
Views: 7548

Re: Polymoog 203A Restoration - You Got to Love Spaghetti!!

It's odd how they socketed some chips but not others.
by Dr. Phibes
Tue Jun 09, 2015 5:43 pm
Forum: General Synthesizers
Topic: Buying under-priced vintage synths
Replies: 61
Views: 19587

Re: Buying under-priced vintage synths

Well yeah. I'm not going to argue that there's any inherent virtue in it but that in all honesty I would probably grab the bargain.

Might feel too guilty if it was for a charity sale though.
by Dr. Phibes
Mon Jun 08, 2015 2:56 pm
Forum: General Synthesizers
Topic: Buying under-priced vintage synths
Replies: 61
Views: 19587

Re: Buying under-priced vintage synths

Yeah, I'd be greasy and take it as is. Frankly, I've lost s**t loads over the years on this kind of stuff so I'm not going to turn down a bargain.
by Dr. Phibes
Tue May 26, 2015 6:23 pm
Forum: HELP!
Topic: Removing flux from 40 years old pcbs
Replies: 5
Views: 1495

Re: Removing flux from 40 years old pcbs

Well usually on older Japanese electronics they have a heavy layer of PCB lacquer, pretty common to have that looking yellowey/brown and go gummy with solvents. The flux (if there is any) is usually just little spots here and there. Yeah I hate that stuff. After 30-odd years of dust and (usually) c...
by Dr. Phibes
Mon May 18, 2015 2:07 am
Forum: HELP!
Topic: Korg MS-20 (original) hiss/noise on output
Replies: 16
Views: 4056

Re: Korg MS-20 (original) hiss/noise on output

Oh, I see. Looks like the earlier boards used a regular 100KΩ resistor instead of a 100KΩ variable. Just to be clear, have you checked the VCO-1 waveform selector switch electrically, i.e. if there's a low impedance path between the noise generating circuit and the rest of the board when there shoul...
by Dr. Phibes
Sun Apr 26, 2015 3:49 pm
Forum: HELP!
Topic: Korg MS-20 (original) hiss/noise on output
Replies: 16
Views: 4056

Re: Korg MS-20 (original) hiss/noise on output

Have you tried adjusting VR3 yet?

It's this one on the jack-board:

Image
by Dr. Phibes
Sat Apr 25, 2015 12:17 am
Forum: General Synthesizers
Topic: 60 Year Old Tube Instrument Resurrected!
Replies: 19
Views: 12561

Re: 60 Year Old Tube Instrument Resurrected!

Kewl! Seen these now and again but had I no idea what they actually sounded like. Mind if I ask how the thryratron envelope generator works? The 2D21 is a heated miniature thyratron used as a threshold device resetting an RC timer in this case. http://i61.tinypic.com/2eycck4.jpg A trigger pulse is ...
by Dr. Phibes
Fri Apr 24, 2015 12:51 am
Forum: HELP!
Topic: Korg MS-20 (original) hiss/noise on output
Replies: 16
Views: 4056

Re: Korg MS-20 (original) hiss/noise on output

Since the problem emerged after you had cleaned the switches I'd try going over the wave-form selector on VCO-1 again to make sure the some residue or dislodged dirt isn't to blame.
by Dr. Phibes
Fri Apr 24, 2015 12:43 am
Forum: General Synthesizers
Topic: 60 Year Old Tube Instrument Resurrected!
Replies: 19
Views: 12561

Re: 60 Year Old Tube Instrument Resurrected!

Kewl! Seen these now and again but had I no idea what they actually sounded like.

Mind if I ask how the thryratron envelope generator works?
by Dr. Phibes
Wed Apr 15, 2015 3:57 am
Forum: Buyer's Guide
Topic: Arp Odyssey
Replies: 37
Views: 15104

Re: Arp Odyssey

Really couldn't say. I did notice however that in the Solus' service manual at least the offending resistors are the right value. This site says the Solus went into production in 1980 a year before ARP's bankruptcy. The Mk III odyssey was still being produced during that last year so I imagine the p...
by Dr. Phibes
Tue Apr 14, 2015 3:27 pm
Forum: Buyer's Guide
Topic: Arp Odyssey
Replies: 37
Views: 15104

Re: Arp Odyssey

Yeah looking at the service manual it appears they do. I've recently finished a cloned 4075 (with appropriate resistors) and I think it sounds fantastic. Don't know what the earlier ones were like though.
by Dr. Phibes
Tue Apr 07, 2015 5:53 am
Forum: Synth Shootouts
Topic: Prophet 600 vs Prophet '08
Replies: 18
Views: 11526

Re: Prophet 600 vs Prophet '08

Thats a great comparison, guyaguy. I can totally hear that. My mind is pretty much made up - the P600 is what I'm going to go for. Thanks in part to this thread, I've had a bit of an epiphany. I need to stop fighting against my instincts when it comes to this stuff. Yes, my instincts are almost alw...
by Dr. Phibes
Sat Apr 04, 2015 5:31 pm
Forum: HELP!
Topic: JX-3P saw volume / panel / bender issues
Replies: 16
Views: 3219

Re: JX-3P doesn't boot up / +7V line issues

After the BEEEEEEooooooowwwwww, the faint drone responds to patch changes and keys on the keyboard and over MIDI. Hmm...I remember experiencing this back when my OB-Xa was dead. I think that problem was beyond my skill level...Or, is it oscilloscope time again? Afraid so! The 3p's boards do have lo...
by Dr. Phibes
Sat Apr 04, 2015 5:13 pm
Forum: Synth Shootouts
Topic: Prophet 600 vs Prophet '08
Replies: 18
Views: 11526

Re: Prophet 600 vs Prophet '08

Actually, come to think of it the clackety, cheapo keybed probably lay behind much of my ambivalence toward the p600.