6sn7 Preamp power supply

[ambience exists]

I found this design from a google search that got some good feedback, and I want to build it because I have been looking for a good 6sn7 preamp. I also found a power supply, but it seems like the transformer has an odd VAC, and the regulator s a bit complex and out of my tight, tight budget. Is there a good 250v B+ design that uses either SS or tube rec. and uses a common transformer voltage? Any help would be greatly appreciated.

Thanks, ((AE))

[ambience exists]

Here is the PS in question:

I don't mind using a SS rec. if it is properly snubbed, for cost reasons.

[SY]

That's Frank de Grove's design, a very solid one. I'd probably update the supply a bit (high speed diodes are cheap these days), but if you build it as-is, you'll have a fine performer.

[athos56]

Parts from Angela and Antique Elec Supp. As far as my knowledge of PSUD II is concerned it looks like a fast, low ripple psu. Nothing fancy. I'm thinking of trying myself.

[ambience exists]

That looks nice, but pardon my noobness: what is the symbol at the end of the circuit?

Thanks for the reply.

Also, does anyone have a SS suggestion?

[ambience exists]

Sorry for the double post, but I have a power transformer in my parts box but it has no markings on it. It looks center tapped. How do I find out what kind of voltage will come out of it without killing myself? It would be nice to use some iron I already own.

[athos56]

Originally posted by ambience exists
That looks nice, but pardon my noobness: what is the symbol at the end of the circuit?

Thanks for the reply.

Also, does anyone have a SS suggestion?

The symbol at the end is my best guess at the current draw of the preamp.

About your transformer, I'm sure there is a propper way other then just plugging it in and measuring the leads with a meter (which is likely not a wise thing to do) so I'll let someone else field that question.

[SY]

Actually, that's a fine way of doing it; it will give you the off-load voltage, and by plugging that in to their calculator along with primary and secondary resistances, you can get a decent representation of your transformer.

But there's danger involved, so watch the voltages.

There's a very nice solid-state regulator kit that should work well with this preamp circuit:

http://tech-diy.com/DIY_PWR_LastPass.htm

[ambience exists]

So.. that kit would be the whole supply? hook it right up to the xformer? Looks very cool and noob friendly. I like PCB's!

When I am figuring out this power transformer, what else should I measure besides the volts coming out of the other end?

How do I get the primary and secondary resistances?

Once I get the volts, I'll post the results so maybe someone will know what it is comparable to what I could get new.

My real question: What if it ends up too large? Could I use a resistor to drop the voltage before it goes into the regulator(I have decided I like that kit)? I guess I am just confused about how much of the power supply that sweet PCB kit includes.


Any Ideas?

[SY]

Contact Jack directly about what is/isn't included, though I'm sure the transformer wasn't part of the deal.

The primary and secondary resistances are easily measured with a multimeter. But again, if you start measuring voltages, there are definite safety hazards for a noobie. We don't want to lose you! Check the Safety and High Voltage Practices sticky thread. And I would HIGHLY recommend you invest in Morgan Jones's two books on tubes and tube amps. That will help keep you safe and give you a lot more understanding of what you're doing.