Re: [drakelist] L4B being revivied
[EMAIL PROTECTED] made an utterance to the drakelist gang -- On Mon, 5 Dec 2005, Mike Williams wrote: I am seeking a set of 3-500Z's and chimneys for a L4B I am in the process of renovating; they need not be factory fresh by any means; just have enough transconductance left to pump a few hundred watts! If you have any sitting around, let me know how much you want for them! Try to find some chimneys with the tapered tops to push air across the anode seal and plate heat dissipator. If you use glass cylinders that are not tapered at the top (Coleman lantern glass) you might as well not use any at all. This depends on your operating style, however. If you rarely run the tubes beyond dull gray with a tint of red you can get by without a proper chimney. If you run the tubes red to almost orange (pretty easy to do with 3-400Z) you will want chimneys with the tapered rim. The glass envelope can take more heat than the anode seal where the pin comes through the glass. As for the tubes, my recommendation would be to buy from someone who has used tubes in good working condition (sometimes Tom's Tubes has some nice ones that are used). I've blown a lot of money on crap sold at the auction sites - I have a shelf of dead 3-400Z and 3-500Z tubes that were sold as is - $300 worth of junk that would have bought a NEW matched pair of 3-500ZG. Late model 3-500Z Eimac tubes are prone to leaks and usually fail immediate on turn-on if they haven't been used for 10+ years. Last but not least, if you see about 2500V in SSB position and 160mA or more idle plate current you might want to consider good chimneys because the tubes will get awfully hot. My L4 will deliver 650W with 65W drive in the CW position with 3-400Z and it will run forever on any band - do this in SSB mode for another 2dB (1100W) without good chimneys and you'll melt the solder in the tube pins and ruin your tank coil or bandswitch on WARC (17m operation for example). Sorry if i'm sounding preachy. Hope this helps. -- 73 Jason N1SU http://n1su.com/ -- 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] L4B being revivied
Mike Williams [EMAIL PROTECTED] made an utterance to the drakelist gang -- Thanks Jason, good tips all; I have not used this amp for 15 years; it was part of the 4 C line I purchased from my father in law. The R4C and T4XC are used regularly on cw and phone and still perform great. Reviving the amp after some storage damage... Regards from Pompano Beach, Mike W4DL - Original Message - From: [EMAIL PROTECTED] To: Mike Williams [EMAIL PROTECTED] Cc: Drakelist drakelist@www.zerobeat.net Sent: Tuesday, December 06, 2005 8:47 AM Subject: Re: [drakelist] L4B being revivied [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Mon, 5 Dec 2005, Mike Williams wrote: I am seeking a set of 3-500Z's and chimneys for a L4B I am in the process of renovating; they need not be factory fresh by any means; just have enough transconductance left to pump a few hundred watts! If you have any sitting around, let me know how much you want for them! Try to find some chimneys with the tapered tops to push air across the anode seal and plate heat dissipator. If you use glass cylinders that are not tapered at the top (Coleman lantern glass) you might as well not use any at all. This depends on your operating style, however. If you rarely run the tubes beyond dull gray with a tint of red you can get by without a proper chimney. If you run the tubes red to almost orange (pretty easy to do with 3-400Z) you will want chimneys with the tapered rim. The glass envelope can take more heat than the anode seal where the pin comes through the glass. As for the tubes, my recommendation would be to buy from someone who has used tubes in good working condition (sometimes Tom's Tubes has some nice ones that are used). I've blown a lot of money on crap sold at the auction sites - I have a shelf of dead 3-400Z and 3-500Z tubes that were sold as is - $300 worth of junk that would have bought a NEW matched pair of 3-500ZG. Late model 3-500Z Eimac tubes are prone to leaks and usually fail immediate on turn-on if they haven't been used for 10+ years. Last but not least, if you see about 2500V in SSB position and 160mA or more idle plate current you might want to consider good chimneys because the tubes will get awfully hot. My L4 will deliver 650W with 65W drive in the CW position with 3-400Z and it will run forever on any band - do this in SSB mode for another 2dB (1100W) without good chimneys and you'll melt the solder in the tube pins and ruin your tank coil or bandswitch on WARC (17m operation for example). Sorry if i'm sounding preachy. Hope this helps. -- 73 Jason N1SU http://n1su.com/ -- 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 -- -- 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] L4B being revivied
I am seeking a set of 3-500Z's and chimneys for a L4B I am in the process of renovating; they need not be factory fresh by any means; just have enough transconductance left to pump a few hundred watts! If you have any sitting around, let me know how much you want for them! Thanks, Mike W4DL
Re: [drakelist] L4B being revivied
Jim Shorney [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Mon, 5 Dec 2005 18:07:04 -0500, Mike Williams wrote: I am seeking a set of 3-500Z's and chimneys for a L4B I am in the process of renovating; they need not be factory fresh by any means; just have enough transconductance left to pump a few hundred watts! If you have any sitting around, let me know how much you want for them! The chimneys in my L4B look suspiciously like the glass from Coleman lanterns... I've never made a direct comparison. -- Jim Shorney --.--Put complaints in this box jshorney (at) inebraska.com Ham Radio NU0C Lincoln, NE, USA EN10ps http://incolor.inetnebr.com/jshorney/ -- 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] L4B being revivied
From what I have heard, the Coleman lantern glass works perfectly. 73, John, W4AWM
Re: [drakelist] L4B being revivied
Jim Shorney [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Mon, 5 Dec 2005 22:06:56 EST, [EMAIL PROTECTED] wrote: From what I have heard, the Coleman lantern glass works perfectly. Thanks, that confirms some idle speculation at a fellow ham's shop building that has several of those lanterns hanging in the rafters... -- Jim Shorney --.--Put complaints in this box jshorney (at) inebraska.com Ham Radio NU0C Lincoln, NE, USA EN10ps http://incolor.inetnebr.com/jshorney/ -- 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] L4B being revivied
Ron Baker [EMAIL PROTECTED] made an utterance to the drakelist gang -- All, I can speak from first hand experience that the Coleman dual lantern globe will fit perfectly as the glass chimney in the L4B. It fits and works perfectly in my L4B. Who would have ever thought you could by replacement Drake parts at Wal-Mart. 73, Ron / WB4HFN -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Monday, December 05, 2005 10:07 PM To: [EMAIL PROTECTED] Cc: drakelist@www.zerobeat.net Subject: Re: [drakelist] L4B being revivied From what I have heard, the Coleman lantern glass works perfectly. 73, John, W4AWM -- 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] L4B being revivied
Jim Shorney [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Mon, 5 Dec 2005 22:58:57 -0500, Ron Baker wrote: Who would have ever thought you could by replacement Drake parts at Wal-Mart. Fact is stranger than fiction. Might look cool if someone got a pair of the RARE yellow ones. I understand they aren't made anymore. -- Jim Shorney --.--Put complaints in this box jshorney (at) inebraska.com Ham Radio NU0C Lincoln, NE, USA EN10ps http://incolor.inetnebr.com/jshorney/ -- 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] L4B being revivied
Tim Kass [EMAIL PROTECTED] made an utterance to the drakelist gang -- I agree, Ive used the coleman lantern glass, several sizes available, about $7 each...doesnt taper at the top like the Eimacs, so not as nice, but 1/5 the price. 73, Tim K8WBL From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] CC: drakelist@www.zerobeat.net Subject: Re: [drakelist] L4B being revivied Date: Mon, 5 Dec 2005 22:06:56 EST From what I have heard, the Coleman lantern glass works perfectly. 73, John, W4AWM -- 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] L4B being revivied
Then there's the old gallon jug and nichrome wire trick! John, W4AWM
