Joe, On the TX power level. Check to make sure you have correct voltages on the AC4. Does the AC4 work well on another rig? Also have a look at your bias setting. Too much toward "Class A" lowers your output. Then of course check the output at 10M vs 80M. The tubes tend to "soften earlier" on higher frequencies, an easy way to tell the tubes are soft. Of course it could also be the 12BY7 driver, or alignment. Unless you think someone "tuned up" the alignment, I would try all the other items first. It still amazes me that these rigs hold their alignment so well for so many years.
73, Ron WD8SBB --- On Tue, 9/7/10, Joe Loverti <[email protected]> wrote: From: Joe Loverti <[email protected]> Subject: [Drakelist] TR-4C RCV / XVCR switch To: "[email protected]" <[email protected]> Date: Tuesday, September 7, 2010, 8:58 PM Hello Drake List Members, I have a TR-4C w/ a few "gremlins" I'm trying to iron out. Was hoping someone may be able to point me on the right direction. The RCVR / XCVR switch on the lower left-hand side of tbd chassis is bad. Does anyone know of a scource for a replacement? I have to hold the switch just so or else the RX goes deaf. Secondly, I'm only able to coax about 65W out on TX. I've been following the instructions on pg 5-8 in the original manual? I'm only getting about .2-.3 amperes of plate current once tuned up. The manual states I should be seeing around .4 ampreres. Any guidance would be much appriciated! Regards and 73, WS8X Joe _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
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