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In Reply to: RE: Adding parts ........ posted by Garg0yle on December 15, 2014 at 19:58:06
No !!!
I was just referring to the INPUT CAP, the very first part of the B+ Filter after the tube rectifier. All the parts you mentioned, on the right side of the schematic, need to stay as per Paul's design. \
Jeff Medwin
Follow Ups:
OK gotcha, the resistor part threw me off.
So I need 1 50uF and 3 100uF per amp then.
I want to cut out decoys made of Styrofoam so I am trying to get the sizes pinned down.
Cheers.
Make the 50 uF input cap an 800 VDC rating. Reliability, conservative operation. Its a stressed part at the start of the filter. Lots happening IN it !!
Jeff Medwin
Yes they are all going to be 700V/800V capacitors.
I might use the Panasonic 100uF 500V for the three other positions other then C1.
I suppose C1 could be a Panasonic 50uF 800V.
As noted by Mr. Steady the Pansonics are cheaper. Whether or not the WIMAS sound nicer, the Panasonics should be better then the Electrolytic.
The cost would be around $200 which seems to be about as good as it gets, especially given my space constraints.
Yes, yes, KEEP C1 at 800 VDC and the others at 500 VDC should be very much OK.
Do not cut yourself short on under-chassis room !!!! Some things are best short, 2 inches or less, RCA jack to driver's grid, silver wire. Silver wire on DC to 2A3 !!! Consider fields, consider layout IN ADVANCE and carefully. PJ gave a good tip on where to locate choke.
Jeff Medwin
Yes I have a general area for the choke and will try PJs trick.
Although not specified, what ever you do, be sure not use any 15A. rated IEC . Use Hubbell 20 A. rated ( Michael Percy ) IEC as a minimum, or better ....Go to Chris VH's web pages and make yourself up decent ( 12 AWG etc ) power cords, perhaps his Flavor 2. " Duster " on the Cable Forum of AA often offers suggestions on cost effective approaches. Have fun.
Jeff Medwin
Edits: 12/16/14
I have already drilled to use a M12 SVT type strain relief for the power cord.
I usually file for IEC sockets but didn't feel like it this time around.
Other then the occasional convenience and looking a little better, I don't really need the IEC socket.
So the pigtail does away with the connection all together.
This does limit the wire to SVT sizes, in my case 18awg as the 16awg SJT wires I had for the IEC sockets don't fit through the SVT pigtail.
I will check it out, although I don't put much credence beyond the usual engineering as far as wires go. I am more concerned with conforming to codes as much as possible.
I mean realistically if one felt the need for 12awg wiring it would make sense to not use the IEC at all, but then comes the challenge of trying to safely secure that thick of wire to the chassis.
Cheers
As you wish.
I am not an IEC fan. Read the Percy catalog on 20 A. IECs, and cable asylum.
On the build I am working on now, I hope to use a Neutrik PowerCon 32 A. device, in lieu of a HUBBELL 20 A. IEC. Look up Thorsten Loesch'S post on that part's use.
Jeff
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