Confusing Schematic

analog music reproduction discussion

Confusing Schematic

Postby kt88pppamp » Thu Sep 27, 2007 6:31 pm

Image

R12 is an RC resistor. What does RC stand for?
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Postby TomMcNally » Thu Sep 27, 2007 6:55 pm

Resistor: Fixed, Composition

ie: an old fashioned carbon composition
resistor, always seem to be favored in
the plate circuit

here is a link to a resistor style table ...



http://www.sqconline.com/reliability/resistor-tables.html#style
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Postby kt88pppamp » Thu Sep 27, 2007 11:11 pm

I am using all metal films for this circuit.
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Postby erichayes » Fri Sep 28, 2007 12:48 am

Rule number one in DIY: Try it.

Rule number two: If it doesn't work, sonically or electrically, try it again from another approach.

Rule number three: Discuss your results with the brethren.

Works just about 100% of the time.

Bear in mind that a phono preamp is one of the most difficult projects a DIYer can undertake. You're fighting hum, noise and equalization gremlins; if you haven't built a project from scratch, I'd strongly recommend that you get some simpler projects under your belt before you attack a PPre.

If, on the other hand, you have some experience with home brew circuitry construction, have at it--and let the rest of us be your support group.
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Postby Shannon Parks » Fri Sep 28, 2007 6:24 am

This is an excellent circuit. I've spiced it and built similar, and it is one of the more on target circuits on the 'net. Anyhow, I think there's nothing special about R12, other than non-metal films sometimes will have higher voltage ratings, hence their usefulness in power supplies.
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Postby EWBrown » Fri Sep 28, 2007 7:10 am

This circuit is *very* similar to the Bottlehead "seduction" linestage circuit topology.

BH uses a lower B+ (around 150VDC) and some different R and C values, to reflect the lower operating voltages, and a few of hiw own design tricks, and offers a CCS option as well.

http://www.bottlehead.com/et/adobespc/S ... uction.htm

(warning, this one has a little bit of mild "cheesecake" present)


http://www.bottlehead.com/et/adobespc/S ... preamp.htm

Shows their RIAA RC values

No, I'm not giving away any "trade secrets", as this is openly posted on the BH site...

Layout and grounding sehemes are fairly critical in any phono stage preamp, this shows a very good low-noise and hum free approach.

This site is an excellent construction tutorial:

http://wardsweb.org/audio/seduction.html





/ed B in NH
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Tube Socket Plug

Postby kt88pppamp » Sun Sep 30, 2007 4:52 pm

Who sells those tube socket plugs that multiple conductor cables connect to? Also, where do you buy that kind of cable?
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Postby EWBrown » Mon Oct 01, 2007 6:22 am

AES has the tube - base plugs, in various configurations, just add your own wires and use some form of heat-shrink or "mesh" covering to keep it neat.

Just remember, the power supply gets the socket, and the preamp gets the plug, that keeps things nice and safe Yellow_Light_Colorz_PDT_03

My term for a power cable with exposed contacts: Rattlesnake. They both can pack a nasty bite...

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Postby kt88pppamp » Mon Oct 01, 2007 9:11 pm

How do I connect the wires to the pins with these sockets. No solder lugs, looks like they are not designed to accommodate wires. Worst of all there is no cap to cover the top, eeek!
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Postby Blackburn Audio » Mon Oct 01, 2007 11:33 pm

We sell the amphenol plugs and sockets in 4,5,6, 8, and 11 pin versions and have plug covers. I have used them to connect an outboard power supply to a 5687 preamp I built. You just have to strip back the wire slide it into the plug and then heat some solder up on the plug tips and the small slits that are in them will allow the solder to flow into the plug and solder the wires in place. Just go to the sockets section on our website and then to amphenol and you will find all the sockets, plugs and covers.

-Matt at Triodeelectronics.com
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