Search found 39 matches

by ImperatorDX
Wed Sep 08, 2010 7:52 am
Forum: HELP!
Topic: Korg Lambda chorus/phase trouble
Replies: 30
Views: 4055

Re: Korg Lambda chorus/phase trouble

Thanks, I appreciate any advice.
by ImperatorDX
Tue Sep 07, 2010 9:45 pm
Forum: HELP!
Topic: Korg Lambda chorus/phase trouble
Replies: 30
Views: 4055

Re: Korg Lambda chorus/phase trouble

The caps have arrived. The only thing is that the 1uF/50V turned out to be smaller in physical size than the originals. Does the size matter or should I go ahead? ;)
by ImperatorDX
Sun Sep 05, 2010 9:30 am
Forum: HELP!
Topic: Korg Lambda chorus/phase trouble
Replies: 30
Views: 4055

Re: Korg Lambda chorus/phase trouble

Thanks rhino, I've already ordered 2SK30A-GR transistors from Hong Kong (they are hard to find) but the delivery can take up to a month. I'll probably also order the caps from a quicker shop and will replace whatever arrives first.
by ImperatorDX
Sat Sep 04, 2010 5:18 pm
Forum: General Synthesizers
Topic: Korg • PS-3200 - mystery synth
Replies: 20
Views: 2532

Re: Korg • PS-3200 - mystery synth

My Lambda also has 48 notes polyphony with two VCAs per key. It means it doesn't reset the envelope when a new note is played in addition to those already playing. It's got only one VCF though, which kind of sucks for the brass preset - unless the filter is fully open, it retriggers when new notes a...
by ImperatorDX
Sat Sep 04, 2010 10:32 am
Forum: HELP!
Topic: Korg Lambda chorus/phase trouble
Replies: 30
Views: 4055

Re: Korg Lambda chorus/phase trouble

Yesterday I replaced IC 2,3,5 and 6 with TL072 dual op-amps. It was a moderate success. Most importantly, I managed not to break anything and the desoldering and soldering process went smoothly. My joints look similar to the original ones, which boosted my confidence with the soldering iron, desolde...
by ImperatorDX
Sat Sep 04, 2010 8:45 am
Forum: General Synthesizers
Topic: The Appearance of Synths
Replies: 53
Views: 5883

Re: The Appearance of Synths

no quotation neccisary, it's simple logic.(and this wasn't directed at you, it was in general ;) ) but i think i see where the confusion is. let me clarify: (...) All right, that's understandable. Now my simple logic: 1) AND = 2) If 1) exists then [ OR [I don't like the sounds]] AND [I don't like t...
by ImperatorDX
Fri Sep 03, 2010 8:08 am
Forum: General Synthesizers
Topic: The Appearance of Synths
Replies: 53
Views: 5883

Re: The Appearance of Synths

it's one thing to appreciate the look of a particular synth, or really detest the look of another, but when you start making decisions on what you want to own and use based on looks, it shows that the mucisal value and functionality of the synth are less important than the looks. Your premise is fl...
by ImperatorDX
Thu Sep 02, 2010 9:04 pm
Forum: General Synthesizers
Topic: The Appearance of Synths
Replies: 53
Views: 5883

Re: The Appearance of Synths

It matters because it's a part of the synth. I'm not the kind of person who easily accepts short-sighted statements like 'it's supposed to sound good, not look good' or 'hardware digital is the same thing as software digital'. There are too many factors in between that are important, although many p...
by ImperatorDX
Thu Sep 02, 2010 5:54 pm
Forum: HELP!
Topic: Korg Lambda chorus/phase trouble
Replies: 30
Views: 4055

Re: Korg Lambda chorus/phase trouble

Hmm, it seems like a good idea but I'll leave it for a while if it works fine. There is a little caveat in this project - I've got near zero experience with electronics. I'm learning in parallel to trying to solve this problem. The op-amps have arrived, now I'm going to practise soldering and desold...
by ImperatorDX
Thu Sep 02, 2010 7:20 am
Forum: HELP!
Topic: Korg Lambda chorus/phase trouble
Replies: 30
Views: 4055

Re: Korg Lambda chorus/phase trouble

I think this light blue component is capacitor C2.
by ImperatorDX
Wed Sep 01, 2010 9:19 pm
Forum: HELP!
Topic: Korg Lambda chorus/phase trouble
Replies: 30
Views: 4055

Re: Korg Lambda chorus/phase trouble

While waiting for the new op-amps to arrive, I've found a photo of a different Lambda. Here the chorus/phase circuit looks different from mine. Unlike in my Lambda, the two resistors I mentioned before look complete here and also I've got a black lead soldered to the resistor R206 [edit 0 Ohm resist...
by ImperatorDX
Tue Aug 31, 2010 7:33 pm
Forum: HELP!
Topic: Korg Lambda chorus/phase trouble
Replies: 30
Views: 4055

Re: Korg Lambda chorus/phase trouble

Thanks rhino. I don't know anyone knowledgeable of electronics but I believe I can learn whatever it takes to fix this problem on my own and with assistance of the helpful chaps like you. As I now know what audio tracing is, I'm going to learn how to do it (don't want to electrocute myself or destro...
by ImperatorDX
Tue Aug 31, 2010 6:35 pm
Forum: HELP!
Topic: Korg Lambda chorus/phase trouble
Replies: 30
Views: 4055

Re: Korg Lambda chorus/phase trouble

Thanks for your opinion and suggestions. Could you explain what you meant by audio tracing, please? Those JRC 4558DV op-amps seem to be shared by the Percussive chorus/phase section as well and they process the signal from it correctly, but who knows...
by ImperatorDX
Tue Aug 31, 2010 4:16 pm
Forum: HELP!
Topic: Korg Lambda chorus/phase trouble
Replies: 30
Views: 4055

Re: Korg Lambda chorus/phase trouble

Thanks for your comments, rhino. During a closer analysis of the photos I took, something unusual drew my attention. It looks like two resistors near the BBD chip are trying to initiate a separatist movement or something. Have a look at these photos: http://img829.imageshack.us/img829/6302/res1a.jpg...
by ImperatorDX
Tue Aug 31, 2010 12:14 pm
Forum: HELP!
Topic: Korg Lambda chorus/phase trouble
Replies: 30
Views: 4055

Korg Lambda chorus/phase trouble

Recently I bought a Korg Lambda. It is in nearly pristine condition (for a synth from late 70's) apart from the chorus/phase section which is giving me some problems. Basically, there are two sections on the synth: percussive and ensemble. They can be routed through the chorus/phase independently. T...