Re: [Drakelist] T-4XB problem
In the spot position the tone is perfect. only in the tune or transmit
does the AC noise or raspy tone comes in?
Anyone out there have any ideas what I can do before I send the rig out?
On Thu, Dec 30, 2010 at 4:42 PM, Diane and Edward Swynar wrote:
Hi Lou,
Is it intermittent...? Check your transmit frequency in the SPOT
position---if it still sounds rough, suspect the PTO, exactly as what
happened to my T-4X here!
I had TWO bad / cold solder connections to the large fixed silver mica
tank capacitor therein...ended-up simply outright replacing it.
Yes, it COULD be something else---but as Yogi Berra would say, ...
Sounds like deja vu all over again to me!...
~73!~ de Eddy VE3CUI - VE3XZ
**
- Original Message - From: LOU GIOVANETTI
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Subject: [Drakelist] T-4XB problem
I was on the air on CW with my T-4XB when all of a sudden The
transmitted signal started to sound rough? Any idea what the problem
could be?
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Re: [Drakelist] T-4XB problem
Lou -
Is the transmitted signal 'rough', or is it just the SIDETONE that is
rough??
You might try bridging C129 with whatever electrolytic you have
handy..
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
LOU GIOVANETTI wrote:
In the spot position the tone is perfect. only in the tune or transmit
does the AC noise or raspy tone comes in?
Anyone out there have any ideas what I can do before I send the rig out?
On Thu, Dec 30, 2010 at 4:42 PM, Diane and Edward Swynar wrote:
*/Hi Lou, /*
Is it intermittent...? Check your transmit frequency in the /SPOT
/ position---if it /still /sounds rough, suspect the PTO, exactly as
what happened to my T-4X here!
I had /TWO /bad / cold solder connections to the large fixed silver
mica tank capacitor therein...ended-up simply outright replacing it.
Yes, it /COULD /be something else---but as Yogi Berra would say, ...
/Sounds like deja vu all over again to me!... /
*/~73!~ de Eddy VE3CUI - VE3XZ /*
*/** /*
- Original Message - From: LOU GIOVANETTI
_kb2...@optonline.net_
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To: _drakel...@zerobeat.net_
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Sent: Thursday, December 30, 2010 1:51 PM
Subject: [Drakelist] T-4XB problem
I was on the air on CW with my T-4XB when all of a sudden The
transmitted signal started to sound rough? Any idea what the problem
could be?
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Re: [Drakelist] T-4XB problem
Hi Lou,
Do what Garey once suggested to me, and which I continue to do here to
monitor the T-4X on my R-4: listen to your actual signal on the air, and NOT
the sidetone monitor...
It's amazing the tales that'll tell you, believe me!
~73~ de Eddy VE3CUI - VE3XZ
- Original Message -
From: Garey Barrell k4...@mindspring.com
To: drakelist Drakelist@zerobeat.net
Sent: Friday, December 31, 2010 2:22 PM
Subject: Re: [Drakelist] T-4XB problem
Lou -
Is the transmitted signal 'rough', or is it just the SIDETONE that is
rough??
You might try bridging C129 with whatever electrolytic you have
handy..
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
LOU GIOVANETTI wrote:
In the spot position the tone is perfect. only in the tune or transmit
does the AC noise or raspy tone comes in?
Anyone out there have any ideas what I can do before I send the rig out?
On Thu, Dec 30, 2010 at 4:42 PM, Diane and Edward Swynar wrote:
*/Hi Lou, /*
Is it intermittent...? Check your transmit frequency in the /SPOT
/ position---if it /still /sounds rough, suspect the PTO, exactly as
what happened to my T-4X here!
I had /TWO /bad / cold solder connections to the large fixed silver
mica tank capacitor therein...ended-up simply outright replacing it.
Yes, it /COULD /be something else---but as Yogi Berra would say, ...
/Sounds like deja vu all over again to me!... /
*/~73!~ de Eddy VE3CUI - VE3XZ /*
*/** /*
- Original Message - From: LOU GIOVANETTI
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To: _drakel...@zerobeat.net_
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Sent: Thursday, December 30, 2010 1:51 PM
Subject: [Drakelist] T-4XB problem
I was on the air on CW with my T-4XB when all of a sudden The
transmitted signal started to sound rough? Any idea what the problem
could be?
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Re: [Drakelist] T-4XB problem
Had the same thing. It was the filter cap in the AC4 serving the Lower voltage supply. David Assaf, III W5XU From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of LOU GIOVANETTI Sent: Thursday, December 30, 2010 12:51 PM To: drakelist@zerobeat.net Subject: [Drakelist] T-4XB problem I was on the air on CW with my T-4XB when all of a sudden The transmitted signal started to sound rough? Any idea what the problem could be? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist _ No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1191 / Virus Database: 1435/3349 - Release Date: 12/30/10 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T-4XB problem
I believe he said that he had tried another AC-4.? If not, that is certainly the first suspect! Perhaps I have confused one of the other (five) problems I've got working... :-) Lou, if I did confuse this, definitely try either another supply or at least bridge a suitable cap on the LV supply. If you are able to set the idle current correctly the BIAS supply is probably ok. If this IS the problem, get and install the AC-4R 'upgrade' kit from the Heathkit Shop. Solves, (and avoids,) many unpleasant problems! Happy New Year! 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 David wrote: Had the same thing. It was the filter cap in the AC4 serving the Lower voltage supply. David Assaf, III W5XU *From:* drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] *On Behalf Of *LOU GIOVANETTI *Sent:* Thursday, December 30, 2010 12:51 PM *To:* drakelist@zerobeat.net *Subject:* [Drakelist] T-4XB problem I was on the air on CW with my T-4XB when all of a sudden The transmitted signal started to sound rough? Any idea what the problem could be? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] T-4XB problem
I was on the air on CW with my T-4XB when all of a sudden The transmitted signal started to sound rough? Any idea what the problem could be? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T-4XB problem
Hi Lou, Is it intermittent...? Check your transmit frequency in the SPOT position---if it still sounds rough, suspect the PTO, exactly as what happened to my T-4X here! I had TWO bad / cold solder connections to the large fixed silver mica tank capacitor therein...ended-up simply outright replacing it. Yes, it COULD be something else---but as Yogi Berra would say, ...Sounds like deja vu all over again to me!... ~73!~ de Eddy VE3CUI - VE3XZ ** - Original Message - From: LOU GIOVANETTI kb2...@optonline.net To: drakelist@zerobeat.net Sent: Thursday, December 30, 2010 1:51 PM Subject: [Drakelist] T-4XB problem I was on the air on CW with my T-4XB when all of a sudden The transmitted signal started to sound rough? Any idea what the problem could be? ___ 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] T-4XB PROBLEM
upper side does not quit working after warmup. i will try the freeze spray. thanks guys carey On Nov 30, 2007 7:46 AM, [EMAIL PROTECTED] wrote: Almost sounds like a heat/pressure related problem with respect to the LSB filter. Perhaps trying USB will add more data? -Original Message- From: Carey Lockhart, kc5gtt [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thu, 29 Nov 2007 6:43 pm Subject: [drakelist] T-4XB PROBLEM i have a t4-xb that is giving me a problem. the audio is very narrow. no matter which mic i use it is very pinched up. once it warms up lsb quits. i can tweak the band switch bracket and it will start transmitting again. any sugestions? carey -- More new features than ever. Check out the new AOL Mailhttp://o.aolcdn.com/cdn.webmail.aol.com/mailtour/aol/en-us/text.htm?ncid=aolcmp000503 !
Re: [drakelist] T-4XB PROBLEM
Jim F. [EMAIL PROTECTED] made an utterance to the drakelist gang -- I would try to find some 'freeze spray' and hit various components with it to see which one brings it back to life. My guess is a cracked carbon resistor at the bandswitch. jim / W1FMR --- [EMAIL PROTECTED] wrote: Almost sounds like a heat/pressure related problem with respect to the LSB filter.? Perhaps trying USB will add more data? -Original Message- From: Carey Lockhart, kc5gtt [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thu, 29 Nov 2007 6:43 pm Subject: [drakelist] T-4XB PROBLEM i have a t4-xb that is giving me a problem. the audio is very narrow. no matter which mic i use it is very pinched up. once it warms up lsb quits. i can tweak the band switch bracket and it will start transmitting again. any sugestions? ? carey More new features than ever. Check out the new AOL Mail ! - http://o.aolcdn.com/cdn.webmail.aol.com/mailtour/aol/en-us/text.htm?ncid=aolcmp000503 -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T-4XB PROBLEM
Almost sounds like a heat/pressure related problem with respect to the LSB filter.? Perhaps trying USB will add more data? -Original Message- From: Carey Lockhart, kc5gtt [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thu, 29 Nov 2007 6:43 pm Subject: [drakelist] T-4XB PROBLEM i have a t4-xb that is giving me a problem. the audio is very narrow. no matter which mic i use it is very pinched up. once it warms up lsb quits. i can tweak the band switch bracket and it will start transmitting again. any sugestions? ? carey More new features than ever. Check out the new AOL Mail ! - http://o.aolcdn.com/cdn.webmail.aol.com/mailtour/aol/en-us/text.htm?ncid=aolcmp000503
[drakelist] T-4XB PROBLEM
i have a t4-xb that is giving me a problem. the audio is very narrow. no matter which mic i use it is very pinched up. once it warms up lsb quits. i can tweak the band switch bracket and it will start transmitting again. any sugestions? carey
Re: [drakelist] T-4XB problem?
Garey, I changed R-135 to 33K and it did the trick. I now have bias of -11 volts. Thanks for your help. Boyd W0BUW Garey Barrell [EMAIL PROTECTED] wrote: Garey Barrell made an utterance to the drakelist gang -- Boyd - Well I've never noticed the bias voltage on the relay tube going up with increased AF gain, but then I've never looked! :-) Other things that can cause the relay to hang is if the ANTI-VOX is turned up too high (might key in on AF Gain affecting bias), or if the VOX is turned up too high, or if R106 has gone up in value. Try turning the ANTI-VOX down all the way, and then bringing up slowly until it just prevents tripping of VOX. As you can see, it's a fairly high impedance circuit, so can be difficult to troubleshoot. You should be seeing closer to -5 to -6V on Pin 2 in receive. Depending upon your unit serial number, you might try reducing R135 from 68k to 33k. This stiffens the cutoff supply and you should see closer to -10V on PIn 2 with key-up. I have seen a leaky cap at C205, but not likely. Let us know! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B C-Line Service Supplement CDs Boyd Van Horn wrote: Garey, I also have a tr4-C that the relay holds in transmit. I have done all the things you recommended. I did notice one thing. The neg bias on the 6ev7 on the relay control side is -3.7 volts when it is in receive. But when you increase the audio gain, the bias goes to -6.8 volts. Is this normal ? Sincerely, Boyd W0BUW *//* -- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T-4XB problem?
Garey, I also have a tr4-C that the relay holds in transmit. I have done all the things you recommended. I did notice one thing. The neg bias on the 6ev7 on the relay control side is -3.7 volts when it is in receive. But when you increase the audio gain, the bias goes to -6.8 volts. Is this normal ? Sincerely, Boyd W0BUW Garey Barrell [EMAIL PROTECTED] wrote: Garey Barrell made an utterance to the drakelist gang -- Bill - Bias voltage is relied on to open the relay by cutting off the 6EV7 relay tube and if that voltage is low because of leaky electrolytics or ripple in the Bias supply in the AC-3/4., the tube doesn't cut off as quickly. Since you have eliminated the supply, another possibility is that the 6EV7 is slightly gassy, which again causes tube to want to continue conducting after it is told to cut off, especially after long transmissions! Yet another possibility is that the final tubes are dropping in emission, which requires you to set the bias voltage more positive to set the idle current to the proper value, again resulting in reduced negative voltage to cut off the 6EV7. Lastly, there are several very high value carbon composition resistors in the biasing for the VOX. ANTI-VOX and Relay circuits that can increase in value with age, resulting in insufficient cut off bias for the 6EV7. A rule de thumb is that the bias voltage at the Final grids is typically -60 to -65VDC for nominal idle current. Let us know what you find! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B C-Line Service Supplement CDs Bill Ellis wrote: Recently having put my T-4XB/R-4B combo back on the air after 1 year off, I'm finding that when I put the T-4XB in spot mode, I can't get the relay to return to the receive mode. This is not keying the finals(I don't think), it just seems to hang up in the spot mode. About 3-4 years ago, I had rebuilt the AC-4(cap's and all), so I don't think that is the problem. Now I know the the anti-vox and vox delay affect how long the relay remains engaged.I have tried that combination with no success. I could just be getting the wrong combo. My question is where is a good starting point for these two controls. Also, could this be a bad 6EV7? Thanks for any help 73's Bill, WB9CAC Tempe, Az -- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T-4XB problem?
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Boyd - Well I've never noticed the bias voltage on the relay tube going up with increased AF gain, but then I've never looked! :-) Other things that can cause the relay to hang is if the ANTI-VOX is turned up too high (might key in on AF Gain affecting bias), or if the VOX is turned up too high, or if R106 has gone up in value. Try turning the ANTI-VOX down all the way, and then bringing up slowly until it just prevents tripping of VOX. As you can see, it's a fairly high impedance circuit, so can be difficult to troubleshoot. You should be seeing closer to -5 to -6V on Pin 2 in receive. Depending upon your unit serial number, you might try reducing R135 from 68k to 33k. This stiffens the cutoff supply and you should see closer to -10V on PIn 2 with key-up. I have seen a leaky cap at C205, but not likely. Let us know! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B C-Line Service Supplement CDs www.k4oah.com Boyd Van Horn wrote: Garey, I also have a tr4-C that the relay holds in transmit. I have done all the things you recommended. I did notice one thing. The neg bias on the 6ev7 on the relay control side is -3.7 volts when it is in receive. But when you increase the audio gain, the bias goes to -6.8 volts. Is this normal ? Sincerely, Boyd W0BUW *//* -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T-4XB problem?
Garey, Thanks for the info. I'll try another 6EV7 as a first attempt at a cure. One other thing I failed to mention earlier, it may sound trivial, but, I've noticed that the connecting cables RCA plugs over the years have oxidized or become tarnished. Should this be a concern for proper operation not only for this problem, but for general operation? Bill, WB9CAC Garey Barrell [EMAIL PROTECTED] wrote: Garey Barrell made an utterance to the drakelist gang -- Bill - Bias voltage is relied on to open the relay by cutting off the 6EV7 relay tube and if that voltage is low because of leaky electrolytics or ripple in the Bias supply in the AC-3/4., the tube doesn't cut off as quickly. Since you have eliminated the supply, another possibility is that the 6EV7 is slightly gassy, which again causes tube to want to continue conducting after it is told to cut off, especially after long transmissions! Yet another possibility is that the final tubes are dropping in emission, which requires you to set the bias voltage more positive to set the idle current to the proper value, again resulting in reduced negative voltage to cut off the 6EV7. Lastly, there are several very high value carbon composition resistors in the biasing for the VOX. ANTI-VOX and Relay circuits that can increase in value with age, resulting in insufficient cut off bias for the 6EV7. A rule de thumb is that the bias voltage at the Final grids is typically -60 to -65VDC for nominal idle current. Let us know what you find! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B C-Line Service Supplement CDs Bill Ellis wrote: Recently having put my T-4XB/R-4B combo back on the air after 1 year off, I'm finding that when I put the T-4XB in spot mode, I can't get the relay to return to the receive mode. This is not keying the finals(I don't think), it just seems to hang up in the spot mode. About 3-4 years ago, I had rebuilt the AC-4(cap's and all), so I don't think that is the problem. Now I know the the anti-vox and vox delay affect how long the relay remains engaged.I have tried that combination with no success. I could just be getting the wrong combo. My question is where is a good starting point for these two controls. Also, could this be a bad 6EV7? Thanks for any help 73's Bill, WB9CAC Tempe, Az -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- - Get easy, one-click access to your favorites. Make Yahoo! your homepage.
Re: [drakelist] T-4XB problem?
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Bill - That's where I'd start! Easy things first. Generally speaking, nominal oxidation of the RCA connectors isn't a problem. Salt or other corrosive atmospheres can alter that, but usually just plugging and unplugging connectors a couple of times will clear any problem. One of the nice things about tube gear is that the voltages and currents can burn through normal oxidation. On the other hand, solid-state gear often is repaired by merely unplugging and resetting cables and internal PC cards, etc. One problem that does affect the RCA connectors is their tendency to lose tension, both in the center female socket and the outer male shell. It should require a little effort to unplug a cable, if it just falls out it's a good idea to squeeze the shell and the center socket to tighten them up. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B C-Line Service Supplement CDs www.k4oah.com Bill Ellis wrote: Garey, Thanks for the info. I'll try another 6EV7 as a first attempt at a cure. One other thing I failed to mention earlier, it may sound trivial, but, I've noticed that the connecting cables RCA plugs over the years have oxidized or become tarnished. Should this be a concern for proper operation not only for this problem, but for general operation? -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] T-4XB problem?
Recently having put my T-4XB/R-4B combo back on the air after 1 year off, I'm finding that when I put the T-4XB in spot mode, I can't get the relay to return to the receive mode. This is not keying the finals(I don't think), it just seems to hang up in the spot mode. About 3-4 years ago, I had rebuilt the AC-4(cap's and all), so I don't think that is the problem. Now I know the the anti-vox and vox delay affect how long the relay remains engaged.I have tried that combination with no success. I could just be getting the wrong combo. My question is where is a good starting point for these two controls. Also, could this be a bad 6EV7? Thanks for any help 73's Bill, WB9CAC Tempe, Az - Be a better sports nut! Let your teams follow you with Yahoo Mobile. Try it now.
Re: [drakelist] T-4XB problem?
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Bill - Bias voltage is relied on to open the relay by cutting off the 6EV7 relay tube and if that voltage is low because of leaky electrolytics or ripple in the Bias supply in the AC-3/4., the tube doesn't cut off as quickly. Since you have eliminated the supply, another possibility is that the 6EV7 is slightly gassy, which again causes tube to want to continue conducting after it is told to cut off, especially after long transmissions! Yet another possibility is that the final tubes are dropping in emission, which requires you to set the bias voltage more positive to set the idle current to the proper value, again resulting in reduced negative voltage to cut off the 6EV7. Lastly, there are several very high value carbon composition resistors in the biasing for the VOX. ANTI-VOX and Relay circuits that can increase in value with age, resulting in insufficient cut off bias for the 6EV7. A rule de thumb is that the bias voltage at the Final grids is typically -60 to -65VDC for nominal idle current. Let us know what you find! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B C-Line Service Supplement CDs www.k4oah.com Bill Ellis wrote: Recently having put my T-4XB/R-4B combo back on the air after 1 year off, I'm finding that when I put the T-4XB in spot mode, I can't get the relay to return to the receive mode. This is not keying the finals(I don't think), it just seems to hang up in the spot mode. About 3-4 years ago, I had rebuilt the AC-4(cap's and all), so I don't think that is the problem. Now I know the the anti-vox and vox delay affect how long the relay remains engaged.I have tried that combination with no success. I could just be getting the wrong combo. My question is where is a good starting point for these two controls. Also, could this be a bad 6EV7? Thanks for any help 73's Bill, WB9CAC Tempe, Az -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] T-4XB problem
John R Sandidge [EMAIL PROTECTED] made an utterence to the drakelist gang -- After 20 years, and a severe stroke, I have taken a storage set of twins, Drake R-4B and T-4XB, out of the closet. The receiver works fine, but the transmitter does not. It turns on, but doesn't have any output. Bill Frost's Drake Museum says that the D-5 diode is bad. I can't find it to check it out. Would one of gentlemen please direct me to the right spot. I will have to get friend to help me, as I have only one arm, but would really like to have it working. I have the original instruction manual and schematic diagram in my possession. JohnWA4ZKA John R. Sandidge PO Box 1245 Whitley City, KY 42653-1245 (606) 376-2095 -- On Behalf of John R Sandidge [EMAIL PROTECTED] Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
