I checked the schematic and R3 in AC4 IS 100 ohm at 5 Watts not shure where I got 1000 so will look for that but in any case 250V B+ is still shorted and filimants are 'on' and nothis is smoking with wire in place. Am not leaving it on though and I did get some 10A glass fuses at the auto parts store OR will use the single strand of wire from the zip cord. Then will pull tubes and try the 250 v line again.
Paul Message: 5 Date: Fri, 05 Feb 2010 18:09:34 -0500 From: Garey Barrell <k4...@mindspring.com> Subject: Re: [Drakelist] T4XB No +250V AND blown Filament Fuse To: drakelist@zerobeat.net Message-ID: <4b6ca52e.8080...@mindspring.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Paul - I realized I used the wrong number for the "fuse" wire. I actually use a single strand of 18-2 ZIP cord, which I think is #33. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs <www.k4oah.com> Paul Gerhardt wrote: > OK and thanks to all. I just got back home and am going to try the > T4Xb troubleshooting again this weekend. Will pull the finals and see > if that is what is pulling the 250 B+ down. The R3 was in the AC4 > sorry for not noting this before. I looked at the old one and the > schematic and was reading it as 1k but will look again and make sure > it I have the value correct. Auto parts store had some 10amp glass > buss fuses in packs of 5 so I got one for the fil fuse 8A and will at > least replace the #22 wire I put in there before I do any more. The > filaments are lighting ok with the wire in at this point. > 73, > Paul > -- Paul Gerhardt K3PG http://pgerhardt.blogspot.com QRP ARCI 6674 FP 274
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