Title: Initial Power Up Post by: David, K3TUE on June 28, 2006, 05:28:19 PM I was reading Mark, K3MSB's notes on refurb'ing his DX-100 (http://www.k3msb.com/dx100b/dx100b.html) and saw he mentioned his procedure about bringing up an uncertain rig up for the first time.
Quote "I performed the typical bring up sequence with a variac (all tubes removed, then install the rectifiers, then all tubes installed)." I bought a variac and thought that was all I had to do. Stupid me. I checked and saw that my DMM will read up to 10A AC, so I have the readings covered. But I see from reading that his procedure is even more detailed than is implied by the above statement, since his readings taken (presumably from the DX-100 assembly manual) seem to add the tubes in stages: 1) 6AL5, OA2, and 5V4G (recitifier, voltage regulators, and <?>) 2) 5R4GY's (<?>rectifiers) 3) 12AX7, 12BY7, 1625's (audio) 4) 6AU6, 6AQ5, 5763, and 12BY7A (<?>vfo, driver) 5) 6146's (finals) Is this common? It seems much smarter than just plugging it in, saying a prayer, and flipping the switch. Also, once it is done being rebuilt, do I still need to use a variac every time I power it up? Should I purchase an Inrush Current Limiter from ER Mag for every tube rig? Or can I just flick the switch now that it has been rebuilt? And does solid stating the power supply rectifiers lessen the need to take any of the above measure for power-up as Mark implies at the end of his notes. Quote I intend to replace the 5V4G and the two 5R4GY's with solid state replacements. This will not only keep things a bit cooler, but will be less wear and tear on the power transformer. BTW, I am asking because I own a Globe Scout Deluxe I will be trying to get up and running sometime in the near future. And I don't want to damage it by doing things wrong. Title: Re: Initial Power Up Post by: David, K3TUE on June 28, 2006, 11:24:37 PM That makes so much sense. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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