[Drakelist] FS: R-4B and a T-4XB
The R-4B and T-4XB are sold. Thanks for the interest. 73, Terry - W8NJR ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Drake L75 Plate Choke Capacitor
I was checking out my L75, preparing to list it on ebay or take it to the San Antonio Swap-fest, when I discovered the Plate Choke Capacitor had gone bad. It is the long, flat, green sheet capacitor used on some of the L75 and L7 Amps. I believe I have read that this is being replaced with a doorknob type capacitor. Can anyone get me up to date on date on what is being used and where it can be obtained? Thanks, John K5FTN___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] R-4B PTO calibration
Yes, I was thinking in terms of uH of inductance vs. the capacitance. Because it will be so easy to so, I'll start by un-tacking the compensating cap just to see what that does. I'm basing this on my seeing all original components in there - which I can't guarantee. I only took a cursory glance at the innards when I was adjusting the Allen screw. Maybe this weekend - though the wx is supposed to be way too nice for me to be inside! Steve, W1ES/4 -Original Message- From: Garey Barrell k4...@mindspring.com Sent: Jan 5, 2012 10:02 PM To: Steve Wedge w1es1...@earthlink.net, drakelist Drakelist@zerobeat.net Subject: Re: [Drakelist] R-4B PTO calibration Steve - I'm not sure, and it's too late tonight to think about it cogently, but keep in mind that you are NOT trying to change the resonance, merely 'slide' the range along the length of the coil. Sorta like passband tuning. You may indeed need a little more capacitance to 'move' the range DOWN to get it in the right place. Think about it, you are not only changing the 'top' end of the range by adding capacitance, you are moving the entire range 'down'. I'd say add about 5 pF and see what your plot looks like. The coil has widely spaced turns in the center and close wound on either end. I think you want your 250 kHz dial point to fall near the center of the wide spaced turns at 5.025 MHz. 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 Steve Wedge wrote: I set the zero point at 0 on the dial scale. My calibrator is spot-on, but I did rely on also spotting it with my K3 at the upper end, due to the discrepancy and the calibrator's 25 kHz spacing. Actual Indicated 0 0 100k 105.5k 200k 210k 300k 314k 400k 420k 500k 524k I don't have any 90 pf SM's around (I thought I did...), so I'm going to take the night off here while I check my friends' junkboxes over the weekend. From what I can gather, plugging in different values of inductance against different fixed values of capacitance, it appears that, to get a larger frequency excursion from the same change in inductance, I need less capacitance. That would eliminate my theory of the missing compensating cap. Who knows - maybe I'll find some wild-a__ type of cap in there when I open 'er up! That's what I'm hoping Smile emoticon ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] 6JB6A
Greetings to the list, I just had to toss in my 2 cents on the 6JB6A finals. One post recently stated that if the tubes are properly cared for. 'quick tune ups, slight muffin fan pulling air up out of the cage, always dip the plate as a last check' then the tubes should last many many years. When I got my first twins over 10 years back I had heard many cautions (from non-Drake owners) about how fragile sweep tubes were and how I better lay in lots of spare finals. So spares I got but guess what? The same Sylvania finals that came used with the T4XC are still at full output after all those years of very regular use on CW. So I have run them at around 120w out regularly for well over a decade. Maybe its the muffin fan, maybe I've just been lucky, but I have to say that they have held up way better than the naysayers predicted. Sweep tubes are turning out to be more rugged than I am in the long run. Hi ! Jim N5KY ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] 6JB6A
I agree. I'd gotten a matched pair as spares about 14 years ago, I keep them in one of those wooden boxes dried salted cod comes in, but I haven't needed them. Chuck, K1OM On Fri, Jan 6, 2012 at 9:21 PM, abqco...@aol.com wrote: Greetings to the list, I just had to toss in my 2 cents on the 6JB6A finals. One post recently stated that if the tubes are properly cared for. 'quick tune ups, slight muffin fan pulling air up out of the cage, always dip the plate as a last check' then the tubes should last many many years. When I got my first twins over 10 years back I had heard many cautions (from non-Drake owners) about how fragile sweep tubes were and how I better lay in lots of spare finals. So spares I got but guess what? The same Sylvania finals that came used with the T4XC are still at full output after all those years of very regular use on CW. So I have run them at around 120w out regularly for well over a decade. Maybe its the muffin fan, maybe I've just been lucky, but I have to say that they have held up way better than the naysayers predicted. Sweep tubes are turning out to be more rugged than I am in the long run. Hi ! Jim N5KY ___ 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] 6JB6A
Agree. I had C-Lines for 5 or years and contested the whee! out of them. I never replaced any. And, yes - I did keep a set of spares. Now, I just keep a spare transmitter. But I do contest with the K3, when I do contest. It has more to do with the computer... Steve Wedge, W1ES/4 Live free or die: Death is not the worst of evils. John Stark. All my computers have my signature with various pearls of wisdom appended thereto. From: abqco...@aol.com Sent: Friday, January 06, 2012 9:21 PM To: Drakelist@zerobeat.net Subject: [Drakelist] 6JB6A Greetings to the list, I just had to toss in my 2 cents on the 6JB6A finals. One post recently stated that if the tubes are properly cared for. 'quick tune ups, slight muffin fan pulling air up out of the cage, always dip the plate as a last check' then the tubes should last many many years. When I got my first twins over 10 years back I had heard many cautions (from non-Drake owners) about how fragile sweep tubes were and how I better lay in lots of spare finals. So spares I got but guess what? The same Sylvania finals that came used with the T4XC are still at full output after all those years of very regular use on CW. So I have run them at around 120w out regularly for well over a decade. Maybe its the muffin fan, maybe I've just been lucky, but I have to say that they have held up way better than the naysayers predicted. Sweep tubes are turning out to be more rugged than I am in the long run. Hi ! Jim N5KY ___ 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] 6JB6A
There are three primary causes of 6JB6 fatalities. 1. Failure of the AC-4 BIAS supply. 2. Trying to TUNE (or transmit) on the wrong (or NO) antenna 'for a while'. 3. Be one of the: a. Key the transmitter b. Look for the manual for the tune-up instructions. c. Look for glasses to SEE the manual instructions. d. THEN 'dip the plate'! Otherwise, they'll last for decades. 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 abqco...@aol.com wrote: Greetings to the list, I just had to toss in my 2 cents on the 6JB6A finals. One post recently stated that if the tubes are properly cared for. 'quick tune ups, slight muffin fan pulling air up out of the cage, always dip the plate as a last check' then the tubes should last many many years. When I got my first twins over 10 years back I had heard many cautions (from non-Drake owners) about how fragile sweep tubes were and how I better lay in lots of spare finals. So spares I got but guess what? The same Sylvania finals that came used with the T4XC are still at full output after all those years of very regular use on CW. So I have run them at around 120w out regularly for well over a decade. Maybe its the muffin fan, maybe I've just been lucky, but I have to say that they have held up way better than the naysayers predicted. Sweep tubes are turning out to be more rugged than I am in the long run. Hi ! Jim N5KY ___ 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
