Re: [Drakelist] Drake filter caps, etc.
Paul, The Hayseed Hamfest is back in production. They carry re-cap kits for the R-4 and 2-C at a reasonable cost. No affiliation, just a satisfied customer of several kits for the B and C Lines. http://www.hayseedhamfest.com/capkit.htm 73 de Bill, K9RZ - Original Message - From: ph...@aol.com To: drakelist@zerobeat.net Sent: Saturday, August 14, 2010 10:38 PM Subject: [Drakelist] Drake filter caps, etc. I know that Unique Radio Parts closed up shop a couple of years ago, but they used to sell filter cap boards + caps to replace the can caps in the R-4 series and 2B receivers. Does anyone have a mask or template of the actual board(s) that I could use to etch my own one-off PCBs to replace the cans in a 2B and an R-4? I understand that we're no doubt talking about two different PCBs for the two receivers. Also, does anyone know of a source of the blue light-filtering material for the R-4 series dials? TNX in advance. 73/arf, Paul, K4MSG -- ___ 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 Dial - White Diffuser Material
Sorry for the delayed response. I did not want to be rude and ignore all of the good suggestions. I have been busy this week trying to recover a microwave site that was toasted by lightning. I will try and find the quilting template material here locally. There are several craft stores in town, so one of them should have it. 73 de Bill ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] T-4XB Dial - White Diffuser Material
Greetings to the Group, I picked up a Drake T-4XB at a local hamfest that has a cracked white dial diffuser. I still have a couple of the blue filter replacement kits from WA9TGT, but those kits did not include the white diffuser. I see that KG9BV is now selling the blue filter replacement kits including the white diffuser, but email quires to his published address have gone unanswered. Does anyone have a suggestion on where to obtain some of the white plastic material that is suitable for this application? Thanks in advance. 73 de Bill, K9RZ ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] R4-B Cap value?
Kirk, It is listed on K4OAH's service CD as an 8 uF, 150V. The replacment in the capacitor kit from Hayseed Hamfest is 10 uF 200V. This is the same capacitor that blew in my R-4B that prompted me to purchase the kit. 73 de Bill - Original Message - From: Kirk Smith To: drakelist@zerobeat.net Sent: Friday, July 16, 2010 1:01 AM Subject: [Drakelist] R4-B Cap value? Hi I'm looking for the value of C91 on my R4-B. The schematic is very unclear my cap has roasted!! The cap shows 15mf @150volts but the schematic looks more like an 8.can someone help? Thank you!!! Kirk -- ___ 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
[Drakelist] R-4B Recap
Greetings, I am a relative newcomer to boatanchor restoration. So far, the Drakes I have purchased have only required some basic switch cleaning and detailing to bring them back to their original glory. I now have an R-4B that requires the installation of a recap kit from the Hayseed Hamfest. I am looking for some advice from the group on the techniques they have used to replace the 4 section can capacitor with the minimal amount of disturbance to the wiring in the radio. I see that 2 of the 4 mounting tabs are soldered to chassis, one of them is tucked under the audio output transformer. I also see that there is a fair amount of wiring that runs by this can. What should I do to make sure I don't booger up the adjacent wiring when unsoldering the can from the chassis? I assume you clip and re-strip the leads you remove from the tabs on the can, rather than trying to unsolder them? Should I unsolder and remove the audio output transformer? Also, are there any good web resources available that can educate me in some of the better techniques in component replacement used by the experts in boatanchor restoration? Thanks! de Bill, K9RZ ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] R-4C Audio Problem - RESOLVED!
Thanks to Garey and his documentation CD, my birdie problem is resolved! I was able to determine that somewhere in one of my receiver's previous lives a capacitor was added across R83 on the audio board. This provided a feedback loop which caused the audio board to oscillate at approximately 330 KHz. This waveform was clearly visible on the audio output transistor using a scope. It was also backfeeding on the +14 volt buss to the crystal calibrator board which modulated the crystal calibrator output, causing the birdies in the passband of the receiver. Adjusting the volume control changed the frequency of the fundamental oscillation in the audio amp just enough to change the frequencies of the birdies in the passband. My receiver is now working fine and will be taking its place on my operating table shortly. Without Garey's documentation CD in hand, it would have been a long and tedious search for that capacitor. Thanks again to all! 73 de Bill, K9RZ ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] R-4C Audio Problem
Many thanks to all who responded. I swapped out the calibrator board with a known good one from my other R-4C and it made no difference. The birdies really appear to be related to the audio amplifier section. I tried the suggestion of putting a 100 ohm resistor in series with the headphones which reduced the audio level, but the birdies are still present. They are also audible on an MS-4 external speaker. As I said in my original note, they are definitely appearing in the passband of the receiver, as they can be peaked with the preselector but change in frequency with the position of the volume control. I suspect something is flying somewhere in the power supply or audio amplifier section that is tunable with the volume control. I will try to borrow a scope and obtain some capacitors to start my search for the offender. Thanks again. 73 de Bill, K9RZ - Original Message - From: Bill Jackson k...@earthlink.net To: Drakelist@zerobeat.net Sent: Friday, February 05, 2010 10:01 PM Subject: [Drakelist] R-4C Audio Problem I have an interesting problem to present to the group. I'm in the process of restoring a later model R-4C that has a peculiar audio problem. The receiver is working fine with excellent sensitivity on all bands, except that on 80m when I turn on the crystal calibrator, I hear what appear to be weak, but very raspy spurious birdies in between the 25 KHz markers. When I vary the volume control, the birdies sweep through the passband of the receiver. Also, when listening to the audio output with a pair of headphones when the receiver is muted, I hear the usual low level hum that is typical for the R-4C, but it changes characteristics over a relatively small range around the 9 o'clock position of the volume control. The hum does not change in volume, it just sounds rather raspy over this small range, similar in characteristic to the birdies I hear in between the 25 KHz markers. Is it possible the audio output stage is self oscillating at some odd frequency and is somehow mixing with or modulating the output of the crystal calibrator? I don't have access to a scope, but I do have access to a good quality Fluke DVM and an IFR service monitor. I would appreciate any suggestions on where to start looking. This particular receiver was in storage for about 15 years, so I wouldn't be surprised if there are some electrolytic capacitor issues. Thanks in advance. 73 de Bill, K9RZ ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] R-4C Audio Problem
Many thanks to all who responded. I swapped out the calibrator board with a known good one from my other R-4C and it made no difference. The birdies really appear to be related to the audio amplifier section. I tried the suggestion of putting a 100 ohm resistor in series with the headphones which reduced the audio level, but the birdies are still present. They are also audible on an MS-4 external speaker. As I said in my original note, they are definitely appearing in the passband of the receiver, as they can be peaked with the preselector but change in frequency with the position of the volume control. I suspect something is flying somewhere in the power supply or audio amplifier section that is tunable with the volume control. I will try to borrow a scope and obtain some capacitors to start my search for the offender. Thanks again. 73 de Bill, K9RZ - Original Message - From: Bill Jackson k...@earthlink.net To: Drakelist@zerobeat.net Sent: Friday, February 05, 2010 10:01 PM Subject: [Drakelist] R-4C Audio Problem I have an interesting problem to present to the group. I'm in the process of restoring a later model R-4C that has a peculiar audio problem. The receiver is working fine with excellent sensitivity on all bands, except that on 80m when I turn on the crystal calibrator, I hear what appear to be weak, but very raspy spurious birdies in between the 25 KHz markers. When I vary the volume control, the birdies sweep through the passband of the receiver. Also, when listening to the audio output with a pair of headphones when the receiver is muted, I hear the usual low level hum that is typical for the R-4C, but it changes characteristics over a relatively small range around the 9 o'clock position of the volume control. The hum does not change in volume, it just sounds rather raspy over this small range, similar in characteristic to the birdies I hear in between the 25 KHz markers. Is it possible the audio output stage is self oscillating at some odd frequency and is somehow mixing with or modulating the output of the crystal calibrator? I don't have access to a scope, but I do have access to a good quality Fluke DVM and an IFR service monitor. I would appreciate any suggestions on where to start looking. This particular receiver was in storage for about 15 years, so I wouldn't be surprised if there are some electrolytic capacitor issues. Thanks in advance. 73 de Bill, K9RZ /drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] R-4C Audio Problem
I have an interesting problem to present to the group. I'm in the process of restoring a later model R-4C that has a peculiar audio problem. The receiver is working fine with excellent sensitivity on all bands, except that on 80m when I turn on the crystal calibrator, I hear what appear to be weak, but very raspy spurious birdies in between the 25 KHz markers. When I vary the volume control, the birdies sweep through the passband of the receiver. Also, when listening to the audio output with a pair of headphones when the receiver is muted, I hear the usual low level hum that is typical for the R-4C, but it changes characteristics over a relatively small range around the 9 o'clock position of the volume control. The hum does not change in volume, it just sounds rather raspy over this small range, similar in characteristic to the birdies I hear in between the 25 KHz markers. Is it possible the audio output stage is self oscillating at some odd frequency and is somehow mixing with or modulating the output of the crystal calibrator? I don't have access to a scope, but I do have access to a good quality Fluke DVM and an IFR service monitor. I would appreciate any suggestions on where to start looking. This particular receiver was in storage for about 15 years, so I wouldn't be surprised if there are some electrolytic capacitor issues. Thanks in advance. 73 de Bill, K9RZ ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] B-line value Fwd: Drake Equipment
See http://www.wb4hfn.com/DRAKE/DrakeSalePriceHistory.htm 73 de Bill ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [drakelist] Tubes ?
MessageTry http://members.shaw.ca/pacifictv/ I haven't used them personally, but they were recommended to me by a local friend who is also into restoring Drakes . I was able to find most of my current wants at Dayton last year. 73 de Bill - Original Message - From: W8AKR To: drakelist@www.zerobeat.net Sent: Sunday, January 28, 2007 11:38 AM Subject: [drakelist] Tubes ? Hello Gang: Where is the best place (read cheepest/new tubes) to buy NOS tubes? Been looking around, found a 12AU7A for $30. Things can't be that bad? Thanks, Dick W8AKR
Re: [drakelist] Shure 444 element size?
Bill Jackson [EMAIL PROTECTED] made an utterance to the drakelist gang -- If memory serves me, the 444 was grey in color and was a high impedance microphone. The 444D is black in color and is dual impedance, both high and low. 73 de Bill -- Submissions:drakelist@www.zerobeat.net 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] OT: Curtis IM-480 Memory Unit for EK-480 Keyer
Bill Jackson [EMAIL PROTECTED] made an utterance to the drakelist gang -- I realize this is slightly off topic, but I don't know where else to start. Included with the Drake C-Line I recently acquired was a Curtis Electro Devices EK-480M Electronic Keyer with the optional IM-480 Instructo-Memorymate unit. I have the manual for the keyer, but not for the memory unit. A Google search turned up info on the keyer, but not the memory unit. Can anyone direct me to another email group where I may inquire about obtaining a copy of the manual for the IM-480? Thanks in advance de Bill, K9RZ -- Submissions:drakelist@www.zerobeat.net 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] R-4C Audio Problem
Bill Jackson [EMAIL PROTECTED] made an utterance to the drakelist gang -- Greetings, I am working on an R-4C with a strange audio problem. When I rotate the volume control between the 9 and 11 o'clock positions, I hear a faint birdie oscillation at a couple of different spots on the 10m band. The frequency of the oscillation will change with the position of the volume control. Also, when I use a pair of headphones, I hear a distinct change in the quality of the audio in the same range of the volume control that produces the birdies. Any suggestions on what to look for? Thanks de Bill, K9RZ -- Submissions:drakelist@www.zerobeat.net 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] Plug for R-4C Noise Blanker Socket
Bill Jackson [EMAIL PROTECTED] made an utterance to the drakelist gang -- Gents, Thanks for all the responses. I was able to locate ONE from a fellow list member who had an extra. It appears there is no real source for these anymore. The idea about fabricating one from a tube socket and wire was the next best choice. 73 de Bill -- Submissions:drakelist@www.zerobeat.net 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] Plug for R-4C Noise Blanker Socket
Bill Jackson [EMAIL PROTECTED] made an utterance to the drakelist gang -- Greetings, I'm looking for a source and ordering reference for the 7-pin plug containing shorting straps that plugs into the noise blanker socket on the R-4C. Thanks! 73 de Bill, K9RZ -- Submissions:drakelist@www.zerobeat.net 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] R-4C Alignment Procedure Question
Greetings, Can someone tell me which are the green colored rotor contacts on sections S1D and S1E of the band switch on an R-4C? The coloring is gone on mine, probably due to switch cleaning with alcohol. I would like to touch up the alignment per section 5-12 of the manual. Thanks! Bill, K9RZ -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
