Search found 16 matches

by belltones
Wed Feb 20, 2019 1:55 am
Forum: HELP!
Topic: Light bulb for Yamaha CS aftertouch
Replies: 3
Views: 1873

Re: Light bulb for Yamaha CS aftertouch

I just happened to stumble across this and though it's old, I decided to leave the info here for anyone who ever needs it in the future. What you need is a T 3 1/4 bulb with a miniature bayonet base, and any voltage between 15 and 24 should be fine. The one I just worked on had a 24V bulb installed ...
by belltones
Sun Oct 28, 2018 8:32 pm
Forum: General Synthesizers
Topic: E-MU Drumulator 3-sound-set ROM switcher: gauging interest
Replies: 0
Views: 1812

E-MU Drumulator 3-sound-set ROM switcher: gauging interest

I've got a question for any E-MU Drumulator users out there. I'm about half way through designing a 3 sound set EPROM expansion board for the E-MU Drumulator (à la JL Cooper's product of this kind in the 80s), so that a simple external toggle switch could be used to switch between 3 complete differe...
by belltones
Wed Oct 04, 2017 5:08 pm
Forum: Gear Services & Other Goods
Topic: Synth Technicians and Repairs
Replies: 157
Views: 166434

Re: Synth Technicians and Repairs

Bell Tone Synth Works is a new electronic music gear repair workshop in Philadelphia, PA focusing on vintage synths! We just officially launched the business about a year ago, but I've been working on synths for about 8 years now. We also have a blog where we document some of our repairs. http://be...
by belltones
Tue Sep 05, 2017 11:43 pm
Forum: Buyer's Guide
Topic: 1u rack pad synth
Replies: 4
Views: 1938

Re: 1u rack pad synth

Oberheim Matrix 1000
by belltones
Sun Sep 03, 2017 6:04 am
Forum: HELP!
Topic: Using Japanese Synth (Yamaha CS-10) in the US
Replies: 3
Views: 936

Re: Using Japanese Synth (Yamaha CS-10) in the US

Additionally, most synths made in Japan to run on Japanese 100V mains can run just fine on US 117V without any kind of adapter/converter. Occasionally there's a wire you have to move on the transformer to make sure it doesn't run too "hot", but a lot of synth companies would just make two versions, ...
by belltones
Wed Aug 23, 2017 6:59 pm
Forum: HELP!
Topic: Roland jx3p sequencer issues
Replies: 4
Views: 2502

Re: Roland jx3p sequencer issues

The internal battery is only used to keep the RAM "awake" so that your saved patches stick around after the synth has been turned off. Though, I would replace the battery in any case, as it is surely near the end of it's life if it hasn't failed entirely already. Try cleaning the Rate slider. Someth...
by belltones
Thu Aug 17, 2017 8:24 am
Forum: HELP!
Topic: Roland jx3p sequencer issues
Replies: 4
Views: 2502

Re: Roland jx3p sequencer issues

does it ever spit out the notes of the sequence sort of erratically, as if the tempo is changing, and/or with pauses in between them? what you describe could potentially be another manifestation of the same problem that causes those symptoms, which I have seen being caused by noisiness where the seq...
by belltones
Wed Aug 16, 2017 6:42 pm
Forum: General Synthesizers
Topic: ElectroComp EML-101 volt/octave conversion mod
Replies: 9
Views: 6053

ElectroComp EML-101 volt/octave conversion mod

Hi guys, thought you might be interested in seeing this video I just finished editing demoing the mod we did on an ElectroComp EML-101 that allows it to accept 1 V/octave control voltage input! The mod shows off some of the also very cool normal capabilities of the synth too, such as the way the 4 o...
by belltones
Mon Aug 14, 2017 6:53 pm
Forum: General Synthesizers
Topic: 53 Minute comparison - Minimoog and Behringer Model D
Replies: 12
Views: 2072

Re: 53 Minute comparison - Minimoog and Behringer Model D

One thing I think that is overlooked in the discussion that follows these sorts of comparisons as well is calibration. I know Jareth is an experienced synth tech, and I have no doubt that his Minimoog is calibrated correctly. However, there can be slight variations within the range of what qualifies...
by belltones
Sun Aug 13, 2017 11:11 pm
Forum: HELP!
Topic: How reliable is Wire Glue?
Replies: 17
Views: 2001

Re: How reliable is Wire Glue?

The other had lost the solderable area for two or three pins. Lose just one of these and the entire chip is wasted. Ah, it is as I feared. I was hoping that you were about to discover a solution for this problem, but all my experiences made me suspect that it was impossible. I hate it how when just...
by belltones
Sun Aug 13, 2017 12:20 am
Forum: HELP!
Topic: Arp Axxe strange pitch issues
Replies: 2
Views: 1469

Re: Arp Axxe strange pitch issues

I've had this happen before as a result of dirty or tarnished key contacts and/or buss bar. That's why it's only certain notes. You'll have to clean the key contacts. The Axxe is a synth that you have to take apart from underneath, but luckily that means the keyboard is fairly easy to take out. Unsc...
by belltones
Fri Aug 11, 2017 6:59 pm
Forum: HELP!
Topic: How reliable is Wire Glue?
Replies: 17
Views: 2001

Re: How reliable is Wire Glue?

I'm anxious to see if this pans out. As I read the earlier stages of this thread I was thinking there was no way this would work. Also, that I suspected that most people replying here were not familiar with the construction of the 80017A because its traces are not made the same way as even a normal ...
by belltones
Fri Aug 11, 2017 7:39 am
Forum: HELP!
Topic: Jupiter 6 - Master Tuning issue
Replies: 18
Views: 6117

Re: Jupiter 6 - Master Tuning issue

I know this thread is old, but I want to put this info here in case anyone ever comes through again with this same confusion about the D/A offset. When I came across this thread when it wasn't so old, I wasn't registered and was just lurking, but now I am registered and can post, so I am, to say: th...
by belltones
Fri Aug 11, 2017 12:06 am
Forum: General Synthesizers
Topic: Juno 106 Chorus Chip failure or tact switch problem?
Replies: 6
Views: 711

Re: Juno 106 Chorus Chip failure or tact switch problem?

Hi, I don't think it could be the tact switch, because a tact switch is not a switch that locks onto an on or off position. Like all of the tact switches on the Juno, pressing it just sends a message to the CPU, from which point "instructions" are dispatched to the appropriate regions of the synth w...
by belltones
Mon Aug 07, 2017 11:14 pm
Forum: General Synthesizers
Topic: Synth Defects - Ticking Time Bombs
Replies: 70
Views: 98807

Re: Synth Defects - Ticking Time Bombs

Oberheim OB series - bridge rectifier on digital rail side of power supply is really inadequate for the current being drawn and gets so hot that it will scorch the board as well as itself. Even if it hasn't failed yet, it should be replaced with a much higher current-rated one (e.g. 6A instead of 2A...