[Drakelist] Drake R-4A Voltages on Q7 Q8??
Hello everyone, Working on a Drake R-4A 11 tube, S/N 5900 Fixed several things so far...looking pretty good. Still don't think the audio is as good as it should be. Volume needs to be at 12:00 to be fairly loud. Seems like it should be real loud at 12:00, it is on my R-4B and my R-4c. Replaced the Q7 Audio pre-amp...no help. Checked all resistors on Board 1..look pretty close Looking at Garey's doc on the transistor voltages...These do not match up correctly. So, can anyone verify what the voltages should be on Q7 Q8 for me? The audio is not terrible, but I think it is a little low and not as clear as my R-4B here. Scope Signal on Collector of Q7 is 1 Volt P-P, and on Q8 6 volts P-P (Grid of Audio amp) ...that is with a S9 calibrator signal. What do you think...? 73, Lee, KC9CDT Lee Simmonds Summit DCS LLC 260-799-4077 Office 260-403-6936 Cell ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Drake R-4A Voltages on Q7 Q8??
Lee - Those voltages should be very close... What DC voltages do you have? Is the signal you are seeing a clean sine wave, no compression or other distortion? 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com kc9...@aol.com wrote: Hello everyone, Working on a Drake R-4A 11 tube, S/N 5900 Fixed several things so far...looking pretty good. Still don't think the audio is as good as it should be. Volume needs to be at 12:00 to be fairly loud. Seems like it should be real loud at 12:00, it is on my R-4B and my R-4c. Replaced the Q7 Audio pre-amp...no help. Checked all resistors on Board 1..look pretty close Looking at Garey's doc on the transistor voltages...These do not match up correctly. So, can anyone verify what the voltages should be on Q7 Q8 for me? The audio is not terrible, but I think it is a little low and not as clear as my R-4B here. Scope Signal on Collector of Q7 is 1 Volt P-P, and on Q8 6 volts P-P (Grid of Audio amp) ...that is with a S9 calibrator signal. What do you think...? 73, Lee, KC9CDT ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Need a fan for my T-4XC Transmitter?
I need to replace my old 30 year old 110 volt fan on my transmitter. I know a few of you have used the twelve 12 volt fans and some have used the 110 volt version. What I would like to know where I can get power so I don't have to plug the fan in every time I turn the rig on. I would like the fan to come on when I turn on the power to the transmitter, any suggestions? Thank you in advance Michael J Trussell KA8ASN ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Need a fan for my T-4XC Transmitter?
See these pics. the power comes from the 12v filament system. https://picasaweb.google.com/captcurt08/DrakeFanInstall https://picasaweb.google.com/captcurt08/R4BFan?authkey=Gv1sRgCP_B8eCBk669Wg If you have any questions, email me. Curt KU8L On 1/7/2012 5:33 PM, Michael Sue Trussell wrote: I need to replace my old 30 year old 110 volt fan on my transmitter. I know a few of you have used the twelve 12 volt fans and some have used the 110 volt version. What I would like to know where I can get power so I don't have to plug the fan in every time I turn the rig on. I would like the fan to come on when I turn on the power to the transmitter, any suggestions? Thank you in advance Michael J Trussell KA8ASN ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Need a fan for my T-4XC Transmitter?
Well, given the low cost of surplus DC fans, the low noise when running them on lower voltages, and the modest energy consumptionI just leave mine on all the time! On 1/7/12, Michael Sue Trussell mtruss8...@comcast.net wrote: I need to replace my old 30 year old 110 volt fan on my transmitter. I know a few of you have used the twelve 12 volt fans and some have used the 110 volt version. What I would like to know where I can get power so I don't have to plug the fan in every time I turn the rig on. I would like the fan to come on when I turn on the power to the transmitter, any suggestions? Thank you in advance Michael J Trussell KA8ASN ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
