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2007-03-14 by sasami@hotkey.net.au
>when the plate voltage is listed as 45V, is it ok to run 30V? how would you >determine the range of acceptable voltages? Voltages specified are usually MAXIMUM voltages, so running a 45V plate at 30V is fine. Ken __________________________________________________________________
2007-03-14 by ryan williams
some questions: when the plate voltage is listed as 45V, is it ok to run 30V? how would you determine the range of acceptable voltages? anyone know of any books or deccent web sites on tube circuit design? i want to see all the math and models and what not. I have a little bit fr
2007-03-14 by Future Image
Dave Wright / Not Breathing / Carrion Sound has got a large tube synth so you could email him about it. I know he's on this group so you might be able to catch him up on here. Here's his site: http://www.notbreathing.com/schems.html --- In cgs_synth@yahoogroups.com , "kidkrazy58"
2007-03-13 by Mark
On 3/12/07, bbluthang put forth: >There should be many tubes that can be used in this cct. >I use a 1AG5, changed some resistors, different pinout, maybe it >doesn't sound the same as Ken's but it certainly works. That's very interesting, since that tube is listed as a diode pent
2007-03-13 by sasami@hotkey.net.au
>The first schematic is the buffer stage. I've built many a buffer >stage like this except without the 1K resistor. What purpose does this >1K resistor serve? Protection for the chip. It allows the chip to deal with anything odd that gets plugged into it by restricting current fl
2007-03-13 by peng3002
Thanks AM and RB for the explanation. Sounds like good design practice. I'll use it from now on. Thanks, Ken, for exposing me to yet another nice subcircuit. peng --- In cgs_synth@yahoogroups.com , Andre Majorel wrote: > > On 2007-03-13 00:40 -0000, peng3002 wrote: > > > As far a
2007-03-13 by Andre Majorel
On 2007-03-13 00:40 -0000, peng3002 wrote: > As far as the buffer stage goes, even without the 1K resistor it has a > high impedance (100K). What does the 1K resistor do? I'm guessing that > I'd be fine without it, but I would like to employ it in other designs > if it lends some
2007-03-13 by Richard Brewster
You sometimes see a series resistor, 1K or maybe 10K, on the input pin of an op amp connected to a panel jack. The resistor does nothing to change the behavior of the circuit, which is a unity-gain buffer. It may provide a measure of protection for the op amp from static electric
2007-03-12 by peng3002
--- In cgs_synth@yahoogroups.com , "bbluthang" wrote: > > > I assume the 1k/100k were there to provide a hi-Z input, as Ken wrote > - " Any signal applied to an input is first buffered by a voltage > follower based on a TL071 op-amp so as to not load down the output of > whatever
2007-03-12 by bbluthang
--- In cgs_synth@yahoogroups.com , "peng3002" wrote: > The first schematic is the buffer stage. I've built many a buffer > stage like this except without the 1K resistor. What purpose does this > 1K resistor serve? > I assume the 1k/100k were there to provide a hi-Z input, as Ken
2007-03-12 by bbluthang
There should be many tubes that can be used in this cct. I use a 1AG5, changed some resistors, different pinout, maybe it doesn't sound the same as Ken's but it certainly works. Look for pentodes with 1.2V (1.25V ok too!) directly heated cathodes and other similar specs on this l
2007-03-12 by peng3002
I'm building a Matrix Mixer for a portable modular instrument. I have a couple questions about the circuit. http://www.cgs.synth.net/modules/cgs33_matrix_mixer.html The first schematic is the buffer stage. I've built many a buffer stage like this except without the 1K resistor. W
2007-03-12 by sasami@hotkey.net.au
>Has anyone found any data sheets on these tubes?? Only in russian! >I found this page >for a "1Zh24B" which I am guessing is the same as a 1SH24B: > http://www.russiantubes.com/prop.php?t=12&p=7 It looks like it is the same tube. >Unfortunately, it doesn't show the pinouts. Yes
2007-03-12 by Mark
On 3/11/07, kidkrazy58 put forth: >Is there any substitutes that would work for that module cause i cant >find that russian tube and i really want to make it very badley, it >looks beutifull!! the more subs that you might know of the better >chance i can find it and make it, than
2007-03-11 by Mark
I just joined this list after someone on the MOTM list posted about a dual VCA module he built using two CSG65 PCB's. Although I decided to do a bit more research first before I start asking questions. I'm not familiar with directly-heated cathodes, and know extremely little abou
2007-03-11 by Charles Osthelder
Tubes and transistors are actually more similar than different. Both have three basic elements (unless diodes) though tubes have lower input and higher output impedances. Motorboating (low frequency oscillation) is usually caused by instability at higher gain. A single voltage am
2007-03-11 by kidkrazy58
If any one knows some links of somemore ive seen the ones on Kens site and the Synths r us ones, i like these very much but id like to find some more and some that may use diffrent tubes and diffrent kinds of vcas and vcf's and vco's and maybe even some tube wavashapers or tube c
2007-03-11 by kidkrazy58
Is there any substitutes that would work for that module cause i cant find that russian tube and i really want to make it very badley, it looks beutifull!! the more subs that you might know of the better chance i can find it and make it, thanks for the help. -Andrew
2007-03-10 by kidkrazy58
IT makes that rumbly sound when i tune it low, what can i do to fix this, maybe something about loading the output, i dont know. And im kinda curios about something with the tube modules. Im kinda a novice but im wondering like, i know tubes use much difrent impendences as solid
2007-03-08 by Laurie Biddulph
try 6.35mm or 1/4" Best Regards (Mr) Laurie Biddulph Phone: +61 (0)2 4340 0938 Mobile: 0400 257 645 Elby Designs ABN: 70 022 727 605 http://www.elby-designs.com This e-mail and any files transmitted with it are confidential and intended for the addressee only. If you are not the
2007-03-08 by b h
Try searching for 1\4" audio Brett >From: "Matthew Hiscock" audio@... > >Reply-To: cgs_synth@yahoogroups.com >To: cgs_synth@yahoogroups.com >Subject: [cgs_synth] 6.3mm sockets. >Date: Thu, 08 Mar 2007 01:16:29 -0000 > >Hi all, > >My first post here - forgive me if this question's
2007-03-08 by Matthew Hiscock
Hi all, My first post here - forgive me if this question's been asked before. I searched the archives but didn't uncover anything that answered it. I'm placing an order on Allied for parts for a CGS60 and I can't seem to locate the 6.3mm sockets anywhere. Is there another term I
2007-03-02 by bbluthang
Rockby AU 20c each but minimum order of 10, so it'll be $2!! item # 24150 http://www.rockby.com.au/catresults.cfm?stock_no=24150&imageField2.x=0&imageField2.y=0 --- In cgs_synth@yahoogroups.com , "Andrew" wrote: > > So anybody know where I can get "Dual Pot Sliders" ? > > I'd rea
2007-03-02 by Andrew
So anybody know where I can get "Dual Pot Sliders" ? I'd really like to make a multi-bandpass with sliders for the frequency controls... Andrew --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > You have a single pot there. The "2" connects to the same thing (the wiper) > a
2007-03-02 by Jan-Ahrent Czmok
Need money for paying new modules from COTK. Thereof i sell: - Marc Bareille's DBX VCA (with original DBX chips, no THATs) fully functional incl. front panel (pads are not YET connected, because choosable) ==> Pics http://www.flickr.com/photos/jczmok/407374020/ ==> asking around
2007-03-01 by sasami@hotkey.net.au
You have a single pot there. The "2" connects to the same thing (the wiper) at both ends. A dual silder would usally have 4 pins at each end. Ken >The Bandpass filter specifies a Dual Pot for the frequency control. I >wanted to try using a slider (ala 2600) for this control, and
2007-03-01 by Andrew
The Bandpass filter specifies a Dual Pot for the frequency control. I wanted to try using a slider (ala 2600) for this control, and have some Alpha slider potentiometers that have 4 terminals on them marked 1 & 2 at one end and 2 & 3 at the other. One pair of terminals (one per e
2007-03-01 by Rykhaard D.A.M.I.A.N.
For any of those that are interested in hearing some of the possibilities of the Bi N Tic with it's 2 x Bandwidth controls replaced by VCAs, head to the Samples subsection of my webpage. :) Any comments / critiques etc. can be left at the email addy listed on the main page, or to
2007-02-28 by vtl5c3
The 5uF cap doesn't have to be Mylar does it? Wouldn't a 4.7uF Bipolar electrolytic work just as well? Romeo
2007-02-25 by Josue Arias
A cheaap option uis using a PF86 for bub a expensive EF86, just different heater voltage. Best Regards, Josue 2007/2/25, sasami@... sasami@... >: > > The pin changes is all you will need. I've done it quite a few times. > > Ken > > >I read some where that it might work but i dont
2007-02-25 by sasami@hotkey.net.au
The pin changes is all you will need. I've done it quite a few times. Ken >I read some where that it might work but i dont know enough about >tubes, would i have to make any alterations to the tube vcf and other >tube ciruits besides the obv 9 to 7 pin change? OK thanks > > > > >
2007-02-25 by kidkrazy58
I read some where that it might work but i dont know enough about tubes, would i have to make any alterations to the tube vcf and other tube ciruits besides the obv 9 to 7 pin change? OK thanks
2007-02-25 by Gerald Stevens
Damn... sorry that was on-list. Freekin' g-mail... -gerald [Non-text portions of this message have been removed]
2007-02-25 by Gerald Stevens
Hello, I'm insterested in a pair of tubes. I can pay with paypal if possible - if not would you take a check? -gerald On 2/24/07, Richard Brewster pugix@... > wrote: > > I just finished the second VCA of my dual Tube VCA. Both modules worked > the first time with no problems. I u
2007-02-24 by Richard Brewster
I just finished the second VCA of my dual Tube VCA. Both modules worked the first time with no problems. I used most of the default parts values. Mine have two attenuated audio inputs (with the output normalled to the second input for feedback), an attenuated CV input and an init
2007-02-23 by Rykhaard D.A.M.I.A.N.
On 2/22/07, Scott Deyo contact@... > wrote: > > Hi Ryk, > > By any chance, did you have your VCA pointing the "right" way on the > Damper? The voltage > attenuation is 'backwards' on the pot, right? I've wired that one > backwards a few times, > and I probably would have wired my
2007-02-22 by Scott Deyo
Hi Ryk, By any chance, did you have your VCA pointing the "right" way on the Damper? The voltage attenuation is 'backwards' on the pot, right? I've wired that one backwards a few times, and I probably would have wired my VCA the wrong way too, but that's probably just me :) Peace
2007-02-22 by Rykhaard D.A.M.I.A.N.
Update at bottom of message. :) On 2/21/07, Rykhaard D.A.M.I.A.N. rykhaard@... > wrote: > On 2/21/07, sasami@... sasami@... > wrote: > > > > Damper is a voltage divider, but I see no reason why a VCA wouldn't work > > in this position anyway. > > > > Ken > > > > >Taking VCA and B
2007-02-22 by Rykhaard D.A.M.I.A.N.
On 2/21/07, sasami@... sasami@... > wrote: > > Damper is a voltage divider, but I see no reason why a VCA wouldn't work > in > this position anyway. > > Ken > > >Taking VCA and BInTic schenmatics to work with me right now. As > remembered > >that Bandwidth are current limitingh r
2007-02-22 by Jan-Ahrent Czmok
On 21.02.2007, at 02:25, John Loffink wrote: > DIVIDE Pot --> 100K Division pot on schematic > CLOCK In jack --> M+In pad > CV IN jack --> to 1K pullup and 100K Division pot, as in schematic > PULSE OUT jack --> LO Pad > TRIG OUT jack --> HO Pad > UP jack --> UP pad > DOWN jack -
2007-02-21 by sasami@hotkey.net.au
Damper is a voltage divider, but I see no reason why a VCA wouldn't work in this position anyway. Ken >Taking VCA and BInTic schenmatics to work with me right now. As remembered >that Bandwidth are current limitingh reissitors and the Damper one is a >voltage divider., Correct me
2007-02-21 by Rykhaard D.A.M.I.A.N.
Taking VCA and BInTic schenmatics to work with me right now. As remembered that Bandwidth are current limitingh reissitors and the Damper one is a voltage divider., Correct me if I'm wrong. Will check email at work, whilst studying schematics to mix the two. :) Thanks! On 2/21/07
2007-02-21 by sasami@hotkey.net.au
Hi Ryk, I think that would work. Ken >Hey all / Ken: An idea that I had last night, trying to get to sleep: > >Could I replace the 100k Bandwidth pot(s - in my case, not having a >dual 100k), as well as the 50k pot for the Damper - with VCAs? I have >5 Ken Stone / René Schmitz VC
2007-02-21 by Rykhaard D.A.M.I.A.N.
Hey all / Ken: An idea that I had last night, trying to get to sleep: Could I replace the 100k Bandwidth pot(s - in my case, not having a dual 100k), as well as the 50k pot for the Damper - with VCAs? I have 5 Ken Stone / René Schmitz VCAs spare at the moment, and thought of that
2007-02-21 by stuadh
Fluxmonkey, nice work. I'm about to start on my Programer in the next month or so. I have all the parts less the front panel (ordered last night) and I'm just waiting until I finish building my new cabinet. How long did it take you and are there any tips you can pass on. I've bui
2007-02-21 by data2action
since we're sharing, I threw up a pic of my programmer/sequencer, in the "misc" folder under photos... fantastic design, thanks ken! bbob fluxmonkey
2007-02-21 by John Loffink
DIVIDE Pot --> 100K Division pot on schematic CLOCK In jack --> M+In pad CV IN jack --> to 1K pullup and 100K Division pot, as in schematic PULSE OUT jack --> LO Pad TRIG OUT jack --> HO Pad UP jack --> UP pad DOWN jack --> DN pad John Loffink The Microtonal Synthesis Web Site ht
2007-02-20 by Richard Brewster
I removed (shorted out) the 100n capacitor between the CA3140 pin 6 output and the 100k input to the base of the transistor that drives the 4024. This works fine. I don't know if it would reduce the jitter, but it's easy to try. Interesting idea you have to provide the counter in
2007-02-20 by Rykhaard D.A.M.I.A.N.
Anyone with the Bi N Tic VCO/VCF out there know, if it's easier to tune the VCO portion to 1V/O by disconnecting the 4024 counter / 4051 multiplexers? When I was tuning the VCO last night, there were a fair bit of jitter. I've gotten it tuned to under 1% over 4 octaves, but the j
2007-02-19 by Jan-Ahrent Czmok
hi all, thanks for the help regarding CGS37 (this is now working beautifully) i have upcoming questions to CGS09: My design has those pots ( see comments behind if my assumption re: cabling is correct) - POT labeled Divide --> no idea about wiring ? to CMP ??? - CLOCK IN jack. ->