AudioRoundTable.com - RDF feed
type: channel
description: Audio advice and discussions with audiophiles and professionals. Free discussion forums, open to all and frequented by industry experts. Ask questions and get advice on stereos, speakers, hi-end amplifiers, pre-amps, home theater, tube hi-fi, turntables, vinyl, tweaks, music, films, video, DVDs and more.
items: Troubleshooting
items: What fuse are you using?
items: first to the fuse...
items: one more thing...
items: Chassis ground?
items: Rectifier heater voltage

Troubleshooting
type: item
description: Well; here we go. Seems I am blowing fuses upon switching my unit on. I have gone over the trans and PS wireing and it all checks out and looks good. Can a shorted lead on the CCS cause a fuse out on power up? The tranny is Blue/Red secondaries to the anodes of the 6CA4(250V) Red/Yellow to chassis ground Yellow 5v secondaries to the Filament heater pins of the rec tube Cathode to the choke Choke to PS cap + The two primary black wires/ one to the AC input and the other to the switch Then from the switch to the fuse to the AC input neutral return
creator: Manualblock
date: 2005-03-08T22:52:49-00:00

What fuse are you using?
type: item
description: What amp fuse are you using? Slow or fast blow? I'm started with a 2A slow blow and it worked fine. Are you blowing as soon as you switch on or is it when the rectifier heats up?......Colin
creator: colinhester
date: 2005-03-08T23:10:32-00:00

first to the fuse...
type: item
description: this thing ought to be consuming about a half amp from the wall. However, there are going to be transients at switch-on which could easily exceed this amount. By a lot.... Slo-blo is the way to go. an amp or amp and a half should do quite adequately. If you have a 500 mA fast fuse in there I am not suprised you're toasting them... regards, Douglas
creator: PakProtector
date: 2005-03-09T00:13:16-00:00

one more thing...
type: item
description: the 6CA4 is a 6.3 volt heater. Don't worry too much, I suspect you'll get a nice slow warm up and gentle application of HV. Check its cathodes colour compared to the 5687, you might want to put the 6.3 winding on it. regards, Dogulas
creator: PakProtector
date: 2005-03-09T00:18:39-00:00

Chassis ground?
type: item
description: Are you hooking the red/yellow (center tap) to the chassis or the the signal ground path (opposite side of cap on B+)? The CT (or any of the HV supply) should not be in contact with the chassis. Are you using a 3-point (hot/neutral/ground) electrical connection from the wall outlet? I should have pictures of Guinevere up tonight. Amazing, FedEx actually found my house on the first try today and brought dad (OK, mom) a new toy ......Colin http://audioroundtable.com/GroupBuild/messages/210.html
creator: colinhester
date: 2005-03-09T17:13:44-00:00

Rectifier heater voltage
type: item
description: Well, I used the 6V4 with the 5V tap. Turns out the 6V4 should be run off 6.3V. It works well with the 5V but I will up the voltage. Thanks for pointing this out. I should have paid more attention.....Colin http://tdsl.duncanamps.com/show.php?des=6V4
creator: colinhester
date: 2005-03-09T18:23:16-00:00