John - That 'fuse' resistor (27 ohm / 1/2 Watt resistor is for the entire +250 vdc bus. Frying of this resistor often indicates a shorted or shorting can cap, but can also result from leaky bypass caps, shorted tube elements, or after 40 years even just from fatigue.
Current should be about 150 mA or a little less. 73, Garey - K4OAH -----Original Message----- >From: John Cox <[email protected]> >Sent: Jun 7, 2011 8:53 PM >To: [email protected] >Subject: [Drakelist] TR4CW?RIT REPAIR > >I have a TR4CW/RIT that has a short in the screen voltage area. There >is a small ohm resister in the output of the screen supply that has >lost its smoke. I think that it is 27 ohm's, it's been a while since >I looked at the problem, and I think that it is there to act as a fuse >if one of the screen capacitors shorts. > > Any recommendations on a Drake repair specialist in the Tucson/ Phoenix area? >Or >I am going up to Bellingham, Washington in a couple weeks and could >drop it off at a west coast specialist on my way up and pick it up two >weeks later on my way home. > >73, >John Cox >K6HSG >Marana, Arizona > >_______________________________________________ >Drakelist mailing list >[email protected] >http://mailman.zerobeat.net/mailman/listinfo/drakelist _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
