B1 Buffer Preamp

[marc brown]

I'm looking at transformers and they rate them for the secondaries wired in parallel and series -- with series having twice the voltage rating.

How do you wire them in parallel? How about series? I looked online and couldn't find any wikis.

Is the B1 better off with 18V or 9V + 9V?

thanks for the help

[Babowana]

Originally posted by marc brown

Is the B1 better off with 18V or 9V + 9V?

I know that B1 will work happily if receives 18-24VDC from any external power supply.

I understand that you are going to use a transformer having 2 x 18Vac secondary (18Vac in paralleling) or 2 x 9Vac secondary (18Vac in series), to get the recommended 18-24Vdc. And, I think that anyone is equally okay.

Hoping I understood your question correctly . . .

Cheers,

>><<

[troystg]

Originally posted by marc brown
I'm looking at transformers and they rate them for the secondaries wired in parallel and series -- with series having twice the voltage rating.

How do you wire them in parallel? How about series? I looked online and couldn't find any wikis.

Is the B1 better off with 18V or 9V + 9V?

thanks for the help

This would work...


http://www.parts-express.com/pe/show...TOKEN=27301370

[vdi_nenna]

This would work...http://www.parts-express.com/pe/sho...FTOKEN=27301370

"No load voltages can be up to 50% higher"

Mr Pass said it can deliver higher voltages under no load. See last sentence in description on site.

I suggest that the R1 power resistor be made a little larger to provide some more filtering, since the supply is unregulated. Maybe 5 ohms
at 3 watts.

[merlin2069er]

Just wondering if I should add a power switch to the B1. I know it wouldn't hurt.


I'm also conflicted about getting great hookup wire for the B1. Please let me know what a reasonable quality and gauge would be.

Thanks,
JG

[labjr]

Originally posted by merlin2069er
Just wondering if I should add a power switch to the B1. I know it wouldn't hurt.


I'm also conflicted about getting great hookup wire for the B1. Please let me know what a reasonable quality and gauge would be.

Thanks,
JG

If you look on partsconnexion there's all kinds of hookup wire.

http://www.partsconnexion.com/catalog/wire.html

KIMBER TCSS is only about $1 ft. You can go crazy with AGSS silver wire but it's expensive.

[troystg]

Steve @ Apex.jr has Silver plated copper with Tefl#* (the DuPont guys are still banning the use of that word) insulation in various gauges and colors..

[Tea-Bag]

I think for B1 signal wire (RCA's volume pot) anything 28ga and below is good. Too big is what won't fit into the hole.
of course I prefer a good clip lead until I have all the nuances figured out.

[scranton]

This is a remarkable component. I have had it in place of my old modded 565 adcom preamp for a couple of weeks. With a 555 adcom amp and open baffle speakers I can't believe the quality of the sound.

[Melon Head]

Its excellent to see someone reporting back good results with this preamp.