Tube Tremolo

[Bill Layer]

Hey Mark,

>The schematic at (http://www.mindspring.com/~vco/effects/page_001.html)
>says 300V. If you think it would work at a lower voltage I'm all for it.
>I would greatly appreciate if you or anyone has a schematic for such a
>supply.

Sorry - I haven't seen the schemo, but I'll check it out today at lunch. I
wasn't suggesting that we modify an existing design with my comments re:
lower voltages. I'd be happy to find you a PS schematic, but I suspect that
EB could pull one out of his hat more quickly...

>What about the 6 or 12 volts for the heaters? can that be part of the
>same supply?

If you are able to locate a 'vintage' type xfmr, you are in for a treat.
Xfmrs for tube equipment are almost always multi-winding. This means that
ony one xfmr is required for several different supplies. I say vintage
*type*, as they are still made today, often by the same manufacturers.

A typical tube xfmr for a small power amp would have something like this: 

1) 720VAC @ 150mA, center tapped. Rectified full-wave (ala tube rectifier),
this produces 450VDC for the plate supply.

2) 6.3VAC @ 6A, center tapped (?), to provide filament current for the
signal and power tubes.

3) 5.0VAC @ 3A, to provide filament current to a tube rectifer (5AR4, 5U4
etc.).  For some strange reason, most older rectfiers are 5volt. I think
this goes back to the 80 and 83 rectifiers, which were some of the earliest
types produced in large commercial quantities.

>I probably won't be working on this for a while. I would like to try the
>solid state ones first, I havn't yet built anything that wasn't a kit.

Soon enough. Let me know if you need any help.

 
Bill Layer
Sales Technician
<b.layer at vikingelectronics.com>

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