OK I did some more checks today and this is what I see. With the Transceive in Separate and INJ cable hooked up I can hear the Transmiter VFO in the Receiver and I can still adj the Idle current (although the idle goes up another needle width when the relay closes) I turned it over and tried poking the relay while in receive mode and it did not change. I can hear it switching and seems to be working but in Separate the xmit VFO is 'ON' and I can adj the level in the receiver with the bias adj. I pulled V11 and it did not change. Will check the T/R relay again and make shure someting is not stuck in the contacts. I feel it is almost working but not yet...
In Separate should both neon vfo lights be on all the time? I can't remember but now I have the transmitter neon on ALL the time and the rcvr neon goes OFF when I key the mic. In Rcvr AND Xmit Mode either light stays on all the time. Should Both Neons alternate in Separate? Paul - > > > ------------------------------ > > > Content-Type: text/plain; charset="iso-8859-1" > > 100+ watts out but T4 not going fully to standby mode. > Idle current is ok same as before but it is still 'idling' with the TR > relay > in Receive. I can hear 'noise' in the receiver especially with the INJ > cable plugged in. > Not all the damage has been discovered. > > Today I did find a short in one of the 'flea bay' tubes between Cathode and > the 'middle' screen on pin 7. The R30 68 ohm 1/2 watt resistor is on pin 7 > and it opened. > The 100 5 Watt resistor in the AC4 opened this has been replaced with an > on-hand 150 ohm 5 watt which is still running hot with the tubes in > Filament fuse opened and has been replaced with proper fuse > > Will ck some more voltages tomorrow. > > -- > Paul Gerhardt > K3PG > http://pgerhardt.blogspot.com > QRP ARCI 6674 > FP 274 > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://mailman.zerobeat.net/pipermail/drakelist/attachments/20100210/e2cb9576/attachment-0001.html > > > > ---------------------------- > > Paul - > > Make sure that the TRANSCEIVE switch is in SEPARATE and the MODE switch > is in SSB. Are you SURE the relay is dropping out? If these are > correct, pull V11 out of the socket. A heater-cathode short in this > tube will keep the transmitter keyed. > > Check the relay carefully. It is possible for the "Normally Closed" > contacts to be pressed down far enough to trap the "Arm" contact between > the NC and "Normally Open" contacts, keeping the receiver "On" even > though the relay is not energized. > > A 150 ohm resistor at R3 will dissipate about 1.5 - 2W, which will make > the resistor quite warm. 2W of heat is 2W of heat, regardless of how > big the resistor is! A maximum of 18 VDC ACROSS R3 is within the > "normal" range. > > 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: > > 100+ watts out but T4 not going fully to standby mode. > > Idle current is ok same as before but it is still 'idling' with the TR > > relay in Receive. I can hear 'noise' in the receiver especially with > > the INJ cable plugged in. > > Not all the damage has been discovered. > > > > Today I did find a short in one of the 'flea bay' tubes between > > Cathode and the 'middle' screen on pin 7. The R30 68 ohm 1/2 watt > > resistor is on pin 7 and it opened. > > The 100 5 Watt resistor in the AC4 opened this has been replaced with > > an on-hand 150 ohm 5 watt which is still running hot with the tubes in > > Filament fuse opened and has been replaced with proper fuse > > > > Will ck some more voltages tomorrow. > > > > -- > > Paul Gerhardt > > K3PG > > http://pgerhardt.blogspot.com > > -- Paul Gerhardt K3PG http://pgerhardt.blogspot.com QRP ARCI 6674 FP 274
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