Max, I think you will like the B line. I have both the B and C lines. I prefer the B line. My R-4C has lots of the Sherwood stuff, but those are pretty much wasted on me and my casual operating style. I do recommend Garey's (K4OAH) CD to guide you around in the rig. 73, Jim
--- On Wed, 9/16/09, [email protected] <[email protected]> wrote: From: [email protected] <[email protected]> Subject: Drakelist Digest, Vol 15, Issue 17 To: [email protected] Date: Wednesday, September 16, 2009, 11:00 AM Send Drakelist mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit http://mailman.zerobeat.net/mailman/listinfo/drakelist or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of Drakelist digest..." Today's Topics: 1. Re: TR-4C annoyance (Garey Barrell) 2. Re: TR-4C annoyance (Bolbach, Timothy) 3. Re: TR-4C annoyance (Garey Barrell) 4. Re: TR-4C annoyance (Loren McCullough) 5. Re: Drake separates (AirRadio) ---------------------------------------------------------------------- Message: 1 Date: Tue, 15 Sep 2009 15:12:49 -0400 From: Garey Barrell <[email protected]> Subject: Re: [Drakelist] TR-4C annoyance To: drakelist <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Loren - A full scale S-Meter is typical of a receiver in Standby, or in the case of the TR series, when it's switched to transmit. Standby in the transceiver can be approximated by turning the RF GAIN full CCW. Does the S-Meter go to the same reading in both Standby and fault conditions? The meter circuit is a bridge, and depending upon model various tube currents are compared to the AF Output tube current. So anything that causes those currents to change will result in S-Meter action. In the TR-4C, those tubes are V4, and V11, compared with the AF Output tube V17. When the transceiver is in Receive mode, the cathodes of the first two tubes are grounded by a pair of contacts on K1, causing the bridge to be balanced and the meter is set to ZERO by adjusting ZERO on the left side of the radio. When the cathodes are allowed to float, in transmit, those tube currents go to zero and V15's cathode is grounded, causing the S-meter to read upscale with transmitter AGC action. In the alignment procedure R187, under the chassis, is adjusted to cause the meter to read full scale when the RF GAIN control is turned full CCW in Receive. I would check the tube voltages around V4 and V11 to see if there might be a fault at the sockets or in the wiring to K1. Something is causing the current in those two tubes to decrease considerably. It's also possible than one of the tubes may have an internal fault. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs <www.k4oah.com> Loren McCullough wrote: > Lately, my TR-4C has developed an annoying quirk. Shortly after > turning it on (sometimes immediately, sometimes after 10 minutes or > so), the S meter will go nearly full scale and stay there. Usually > keying the mic several times will stop this and it will return to > normal operation (only has done this once after turning on, then is > normal for the rest of the time I have it on). It does not appear to > be in transmit, as I can hear the relay clicking on and off as I key > the Mic. > > Any ideas on this one? > > Loren - WA3WZR > ------------------------------ Message: 2 Date: Tue, 15 Sep 2009 15:47:25 -0400 From: "Bolbach, Timothy" <[email protected]> Subject: Re: [Drakelist] TR-4C annoyance To: <[email protected]>, "drakelist" <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset="us-ascii" My experience in this case has been a problem with the AGC amplifier V13. The circuit voltages will check ok, the tube will check fine in an emission tester. But, the 12AX7 will be bad. Starts intermittently and becomes worse as time goes on. Try replacing the 12AX7. Regards, KD8CN -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Garey Barrell Sent: Tuesday, September 15, 2009 3:13 PM To: drakelist Subject: Re: [Drakelist] TR-4C annoyance Loren - A full scale S-Meter is typical of a receiver in Standby, or in the case of the TR series, when it's switched to transmit. Standby in the transceiver can be approximated by turning the RF GAIN full CCW. Does the S-Meter go to the same reading in both Standby and fault conditions? The meter circuit is a bridge, and depending upon model various tube currents are compared to the AF Output tube current. So anything that causes those currents to change will result in S-Meter action. In the TR-4C, those tubes are V4, and V11, compared with the AF Output tube V17. When the transceiver is in Receive mode, the cathodes of the first two tubes are grounded by a pair of contacts on K1, causing the bridge to be balanced and the meter is set to ZERO by adjusting ZERO on the left side of the radio. When the cathodes are allowed to float, in transmit, those tube currents go to zero and V15's cathode is grounded, causing the S-meter to read upscale with transmitter AGC action. In the alignment procedure R187, under the chassis, is adjusted to cause the meter to read full scale when the RF GAIN control is turned full CCW in Receive. I would check the tube voltages around V4 and V11 to see if there might be a fault at the sockets or in the wiring to K1. Something is causing the current in those two tubes to decrease considerably. It's also possible than one of the tubes may have an internal fault. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs <www.k4oah.com> Loren McCullough wrote: > Lately, my TR-4C has developed an annoying quirk. Shortly after > turning it on (sometimes immediately, sometimes after 10 minutes or > so), the S meter will go nearly full scale and stay there. Usually > keying the mic several times will stop this and it will return to > normal operation (only has done this once after turning on, then is > normal for the rest of the time I have it on). It does not appear to > be in transmit, as I can hear the relay clicking on and off as I key > the Mic. > > Any ideas on this one? > > Loren - WA3WZR > _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist ------------------------------ Message: 3 Date: Tue, 15 Sep 2009 16:01:54 -0400 From: Garey Barrell <[email protected]> Subject: Re: [Drakelist] TR-4C annoyance To: drakelist <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Tim - Good suggestion! I've never run into that, but V13A is the Receive AGC amplifier, and an intermittent internal short could very well crank the AGC up, cutting off current flow through V11 and unbalancing the bridge. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs <www.k4oah.com> Bolbach, Timothy wrote: > > My experience in this case has been a problem with the AGC amplifier > V13. The circuit voltages will check ok, the tube will check fine in an > emission tester. But, the 12AX7 will be bad. Starts intermittently and > becomes worse as time goes on. Try replacing the 12AX7. > > Regards, > > KD8CN > > > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Garey Barrell > Sent: Tuesday, September 15, 2009 3:13 PM > To: drakelist > Subject: Re: [Drakelist] TR-4C annoyance > > Loren - > > A full scale S-Meter is typical of a receiver in Standby, or in the case > of the TR series, when it's switched to transmit. Standby in the > transceiver can be approximated by turning the RF GAIN full CCW. Does > the S-Meter go to the same reading in both Standby and fault conditions? > > The meter circuit is a bridge, and depending upon model various tube > currents are compared to the AF Output tube current. So anything that > causes those currents to change will result in S-Meter action. In the > TR-4C, those tubes are V4, and V11, compared with the AF Output tube > V17. When the transceiver is in Receive mode, the cathodes of the first > two tubes are grounded by a pair of contacts on K1, causing the bridge > to be balanced and the meter is set to ZERO by adjusting ZERO on the > left side of the radio. When the cathodes are allowed to float, in > transmit, those tube currents go to zero and V15's cathode is grounded, > causing the S-meter to read upscale with transmitter AGC action. In the > alignment procedure R187, under the chassis, is adjusted to cause the > meter to read full scale when the RF GAIN control is turned full CCW in > Receive. > > I would check the tube voltages around V4 and V11 to see if there might > be a fault at the sockets or in the wiring to K1. Something is causing > the current in those two tubes to decrease considerably. It's also > possible than one of the tubes may have an internal fault. > > 73, Garey - K4OAH > Glen Allen, VA > > Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs <www.k4oah.com> > > > > Loren McCullough wrote: > >> Lately, my TR-4C has developed an annoying quirk. Shortly after >> turning it on (sometimes immediately, sometimes after 10 minutes or >> so), the S meter will go nearly full scale and stay there. Usually >> keying the mic several times will stop this and it will return to >> normal operation (only has done this once after turning on, then is >> normal for the rest of the time I have it on). It does not appear to >> be in transmit, as I can hear the relay clicking on and off as I key >> the Mic. >> >> Any ideas on this one? >> >> Loren - WA3WZR >> ------------------------------ Message: 4 Date: Tue, 15 Sep 2009 19:12:51 -0400 From: Loren McCullough <[email protected]> Subject: Re: [Drakelist] TR-4C annoyance To: [email protected],drakelist <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset="us-ascii" An HTML attachment was scrubbed... URL: <http://mailman.zerobeat.net/pipermail/drakelist/attachments/20090915/3472d69a/attachment-0001.html> ------------------------------ Message: 5 Date: Wed, 16 Sep 2009 09:43:54 +0100 From: "AirRadio" <[email protected]> Subject: Re: [Drakelist] Drake separates To: <[email protected]> Message-ID: <e55fd8c6665244df804f73ef7e7e0...@guinness> Content-Type: text/plain; charset="iso-8859-1" Well, thanks everyone for a very interesting and lively response to my mail on this reflector, great to have so many opinions and thoughts on this subject, I think after due consideration I will be looking for a TX-4B and an R-4B the choices were made on the following, most of the 'extras' come built in, prettier looks, just seem more appealing and will go well with my L-4B (B version), more valves, thus easier for me to work on and probably to get spares too, some transistors are getting hard to find, not so with most valves. Anyway when I find them I will almost certainly be asking more questions, 73 Max M0GHQ -- I am using the free version of SPAMfighter. We are a community of 6 million users fighting spam. SPAMfighter has removed 1805 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len The Professional version does not have this message -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.zerobeat.net/pipermail/drakelist/attachments/20090916/52f01888/attachment-0001.html> ------------------------------ _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist End of Drakelist Digest, Vol 15, Issue 17 *****************************************
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