Tube synth diy

Hi Fernando
I have seen a few books with photomultiplier circuits but none of them
seemed suitable for synth apps....at least to me....2000V power supply
and very sensitive.
If you want I can have a 2nd look...probably just the thought of
trying to source a photomultiplier put me off. 

Have you checked out photo-detector tubes, they can be pretty cheap on
ebay. I got 6 for $5 last year, tho 3 of them were corroded.
There are a few ccts for these in files, an interesting one could be
made with the Douglas envelope shaping circuit. Or if you want to go
all Raymond Scott, check out Weber - low freq waveform generator.
Also worth a look is 'blind aid' in medical ccts - scanning a
photodetector tube over print gives tones that are (supposedly)
complex enough for the listener to identify the letters.
regards
Andrew



--- In tubesynthdiy@yahoogroups.com, "Fernando de Izuzquiza" <fdi@...>
wrote:
>
> Hi,
> 
> Would the photomultipliers be of any use?
>  Like the 2055 I just know of it's existance.
> 
> best,
> 
> Fernando
>