DC to DC converter for a tube pre amps anode voltage

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okabass

Active member
Joined
Feb 17, 2006
Messages
43
Location
Lahti,Finland
HI

I have a DIY SVT "fridgerator" as a main bass amp. How ever, I'm going to make a little bassamp for small gigs with that Cold amp pack.
https://www.coldamp.com/store/pack-active-speaker-30.html

It'll have an SVT-type tube pre, because I like the way it sounds.
I try to make the amp as light as possible, so I first try not to use transformers.
Need the most simple way to convert that +/- 60 VDC to around 250-300 VDC for the 12DW7 anodes (SVT-type pre). It only takes 20-40 mA. Is there one chip that makes it? The filament voltage can be taken from that PSU.
Thanks.
 
On the freestompboxes forum, there are a number of people experimenting with this, I myself have build only one DCDC converter.
I used a plain old 555 and got about 17volts out of a 9volt battery. The 55 approach doesn't lend itself to scaling, but you could use an ICL7660 and I think you could get more volts out of those, at least 70-100, I ordered a few but haven't tried myself.

If you google " cockroft-walton" you get more on this topic.
 
I've used this with some success...

r3 can be a pot to make it adjustable. This can also be done with a cheap and simple 555 timer.

http://www.electricstuff.co.uk/nixpsu.html
 

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