Vicor DC-DC for B+

[Anchan]

I have enough spare parts to make a PSU for a Salas 6V6 preamp. The idea is to run it from a 24V DC power supply.

I have several of these:
VI-J1B-EY | VI-J00 Series DC-DC Converters | Vicor
and a few others, enough to make a 330VDC B+ from a 24V PSU. The idea is to put the converters in series to get the necessary voltage. I might put this on the final B+ output: 21st Century Maida Regulator: A modern B+ voltage regulator – Neurochrome

I also have this, that I can trim to 6.3 for the heater.
VI-J1T-CY | VI-J00 Series DC-DC Converters | Vicor

I plan to use this ripple attenuator, which I also have, on the output of 6.3V converter.
Ripple Attenuator Module - RAM | Vicor Corporation

Besides the fact that this is all unnecessarily complicated, I'd like to try it. Are there any reasons not to? How about at amp startup? As I understand it, this might be a difficult scenario for the PSU.

Can I put an NTC on the output of the 24VDC power supply, and before the converters?
https://www.alliedelec.com/m/d/5537bfe04244704ae50832ab5bfb2832.pdf

 

[rayma]

They spec it at 500Vrms dielectric withstand output to base plate, but I'd still check with them
about this particular application. And ground all the base plates.

 

[Anchan]

Definitely will contact Vicor. Good advice.
This application note says to use a split supply, 200V max to the baseplate:
http://www.vicorpower.com/documents/application_notes/an1_high-vout.pdf

 

[Anchan]

I'm guessing this 200V limit is a deal breaker.

This means in stacking these modules, I'd have a virtual ground at around -160V, earth at 0 VDC, and B+ at +160V.

Thoughts? Seemed like a an easy solution, with isolated relatively low noise parts... but alas.

 

[rayma]

Time to use a tried and true approach.

 

[kodabmx]

This will run it. I use one for a stereo 6P15P amp driven with a 12V 10A brick supply.... Despite the title, it is AC AND DC.
DC-AC Converter 12V to 110V 200V 220V 280V 150W Inverter Boost Board Transformer | eBay

 

[Mark Tillotson]

I've used these before successfully. They are not output-short-circuit protected, I discovered (!), but seem to behave otherwise. DC 12V 24V to DC 200-450V 280V 380V High Voltage Boost Step Up Converter 70W | eBay

 

[kodabmx]

I've used those, too. They will oscillate if you aren't careful. I use one for a HP amp and you can hear it oscillate while the tubes warm up and start to conduct.

 

[Anchan]

Although my question was about the vicor modules I have, now I'm down ebay the rabbit hole

There are quite a few of these, and I haven't seen anyone mention them on this forum:
7R 230W 5R 200W Moving Beam Head Light Power Supply 380v 12v 24v | eBay
They are for some kind of high powered DJ lights.

What do you think is going on in this circuit?
Do you assume isolated?

 

[kodabmx]

The 380V output is beside the input connections, I would assume it isn't isolated but it may be.

Interesting though, I've never seen this one before.

 

[PRR]

...Do you assume isolated?

My bet is NO.

You couldn't fit a fat cockroach between "L" and "380V".