F6 Amplifier

[vdi_nenna]

I would be more inclined to make a outboard PSU for the transformer, rectifier and first caps, that will keep the bulk of the switching noise away from the circuit, but much more importantly, keep the big honkin' unshielded toroid away from the little unshielded input transformers...

That's a good idea. Cost more, but in the end will make things more manageable and even easier to lift.

Thinking about high current connectors. I'm not a big fan of Speak-on connectors.

 

[6L6]

You could always use a screw-terminal barrier strip. But it's exposed. Speakon have the advantage of being insulated and polarized - you're not going to cross-connect anything.

They have a connector made specifically for power - powerCON 20 A - Neutrik but only three connections.

FWIW, I used speakon in mine.

 

[Zen Mod]

if it's good for XS ............ 8 pole Speakon .....

 

[vdi_nenna]

I fixed a set of siegfried's open baffles. Speak-on's were a mess. Connections so close together. A short was guaranteed.

I will probably stick with single chassis.

 

[labjr]

if it's good for XS ............ 8 pole Speakon .....

U beat me to it. I had thought that was a 32A Powercon. Neutrik makes good stuff.

 

[Zen Mod]

NL8FC - Neutrik
speakON Chassis Connectors - Neutrik

 

[labjr]

Okay I'll trump that!

From the XS manual. Notice you can't connect them while powered. They have no breaking capacity by design. Probably will short.

"Power Connection – The power supply and channel chassis are
connected by an umbilical cable with Neutrik Powercon connectors.
These connectors have a locking mechanism which requires a
clockwise turn after insertion. Be certain that this connector
locks properly. The little lock button will click upon locking. After
it has been turned and locked it will not rotate back unless you push
the locking button. Do not attempt to make or undo this connection
while the power supply is plugged into the AC outlet."

 

[Zen Mod]

Powerkon-Speakon ........ same thing ....

 

[labjr]

SpeakON is NOT to be used as an AC mains or power supply connector!

 

[Zen Mod]

yeah

and I also believe in everything what I'm reading on internet .....



one thing is physics and praxis , another is commercial and marketing

 

[labjr]

Probably isn't certified for continuous power use in AC or power supplies. Or arcing.

 

[vdi_nenna]

The PowerCON connectors look like a much better solution. Connections points are better isolated from one another.

 

[buzzforb]

concerning umbilicals, how important is shielding considering that evything that is passing is in DC form vs AC. Can you just pass the rails and ground with no fear of noise pickup? Doig this with phono stage....hence the OT question.

 

[Zen Mod]

not overly critical

 

[vdi_nenna]

Can you just pass the rails and ground with no fear of noise pickup?

A tight twisting or braiding might help with rejection or radiating.

 

[Tea-Bag]

concerning umbilicals, how important is shielding considering that evything that is passing is in DC form vs AC. Can you just pass the rails and ground with no fear of noise pickup? Doig this with phono stage....hence the OT question.

I've done this with a two chassis DCB1, AC umbilical, Not even twisted wiring, just some Romex like stuff, no issues with noise.

 

[buzzforb]

Thanks guys. Hope all is well in you're different parts of the world. Back to the dungeon.

 

[vdi_nenna]

Are cl-30 thermistors OK to use in the F6 power supply? They are rated at 2.5 ohm 8 amps.
Have some on-hand.

 

[6L6]

Certainly.

Use what you have, it's much better than nothing.

 

[BigE]

I've done this with a two chassis DCB1, AC umbilical, Not even twisted wiring, just some Romex like stuff, no issues with noise.

I've done this with the PD phono section, but like the DCB1, it has a regulator on board, which ought to help a lot.

Dunno about the case of the non-regulated power supply at the end of the AC umbilical.