Tube synth diy

sounds great
will try it with 6021s. 
Do I need to consider the on/off resistances of the LDRs and adjust
the 100k resistors to suit?

cheers
Andrew


--- In tubesynthdiy@yahoogroups.com, "frequencycentral"
<frequencycentral@...> wrote:
>
> Firstly, lets get the terminology right – this is a vibrato (pitch
> modulation), not a tremolo (amplitude modulation). Tube vibrato is
> not an original concept, similar schematics proliferate in vintage
> tube amps.
> 
> I thought I'd try something similar using two 6111 submini tubes at
> 12 volts. This allows for only two stages of phase shift, but the
> effect is very pleasing and useable. More stages could be added for a
> deeper effect. The advantage of using just two tubes is that it keeps
> the milliamp requirements down - it's quite logical to run the two
> tubes' heaters in series from 12 volts, keeping the current draw down
> to just ~300ma (!!). I dare say that the 6111's could be replaced
> with 12AU7 without too much trouble, or indeed with 6021 or 7327
> subminis.
> 
> Here's a soundclip:
> http://www.aronnelson.com/DIYFiles/up/Vintage_Vibe.mp3
> 
> Signal path:
> 
> Squier Telecaster Custom (HB) > Vintage Vibe > Roland Bolt 60
> watt tube combo > Shure SM58 > Event Echo Gina 24 soundcard >
> Wavelab
> 
> No other processing. It's a montage of a few different settings.
> There are a few crackles because it's a breadboard not a pedal.
> 
> http://i210.photobucket.com/albums/bb292/frequencycentral/VintageVibe.
> jpg
> 
> .....if you can't open the jpg by clicking on it, just copy and paste 
> it......I seem to be having problems!?
>