RE: [drakelist] 6JB6 substitutes
[EMAIL PROTECTED] (Robert Schenck) made an utterance to the drakelist gang -- Be sure to check manufacturer's data first as there are some 6GJ5's that are too tall for the t4X cage. The 6GJ5A by RCA is ok and SND Tube Sales used to sell them in matched pairs for $25 in 2002. john [EMAIL PROTECTED] wrote: john [EMAIL PROTECTED] made an utterance to the drakelist gang -- At 07:53 AM 2/12/2006, Ron Baker wrote: -- Hello Paul, to answer your question on substitute tubes, there are no substitutes for the 6JB6 tube. Actually, the 6GJ5 is spec'd identically with the exception of the supressor grid configuration (which is not a concern in the Drake apps). I've used them plug and play in several of my Drake stations and they work fine. John K5MO -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 267.15.6/257 - Release Date: 2/10/2006 -- 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 -- __ Switch to Netscape Internet Service. As low as $9.95 a month -- Sign up today at http://isp.netscape.com/register Netscape. Just the Net You Need. New! Netscape Toolbar for Internet Explorer Search from anywhere on the Web and block those annoying pop-ups. Download now at http://channels.netscape.com/ns/search/install.jsp -- 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] 6JB6 substitutes
Ron Wagner [EMAIL PROTECTED] made an utterance to the drakelist gang -- Basically the standard substitutes are going to be problems. Even some 6JB6s are issues. Try this link for discussion of issues with neutralizing off brands and subs http://www.mail-archive.com/drakelist@www.zerobeat.net/msg04475.html All that said, the critical issue with life on the 6JB6s is to not key down long while tuning, and as someone else suggested making sure you are correctly tuned on the PA (aka resonated the tank). If you run twins have a look at my post on a kind to finals tune up here http://www.mail-archive.com/drakelist@www.zerobeat.net/msg03471.html And the book A family affair about the RL Drake compay has a good discussion on test done. Good luck, and hope this data helps. 73, Ron Visit my astronomy home page. http://www.dma.org/~wagner Amateur Radio Station: WD8SBB - Ron and KB8NRP - Joann On Sun, 12 Feb 2006, Paul wrote: I see where 6JB6's can be substituted with 6KM6 sweep tubes.Has anyone tried these? Are they a good sustitue or not? Do they physically fit in the RF cage? Tnx 73 AD3G -- 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] 6JB6 substitutes
Ron Baker [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hello Paul, to answer your question on substitute tubes, there are no substitutes for the 6JB6 tube. I know there are several like the 6KM6 and I could identify several more, but none of them will substitute.The reason being those tubes have different interelectrode capacitance. I have experimented with several of these substitute tubes and found because of the difference in capacity the tuning is different and sometimes very strange. I found all of them will work fine on 80 and 40 meters, you get into trouble on the higher bands. All of then tend to oscillate, neutralization is impossible and if it does it drifts around. Some of the substitutes will run a lot more power on 80 and 40, again not work on the high bands, but on 80 and 40 while running more power they burn up the other transmitter components. The bottom line is there are no real substitutes for the 6JB6. I know its bummer but going down the substitute path will eventually cause problems. Here is a link to my drake website, here I have an article where I tested some of these substitutes. http://www.wb4hfn.com/DRAKE/DrakeArticles/Final_Tubes.htm 73, Ron / WB4HFN -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Sent: Sunday, February 12, 2006 12:05 AM To: drakelist@www.zerobeat.net Subject: [drakelist] 6JB6 substitutes I see where 6JB6's can be substituted with 6KM6 sweep tubes.Has anyone tried these? Are they a good sustitue or not? Do they physically fit in the RF cage? Tnx 73 AD3G -- 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] 6JB6 substitutes
john [EMAIL PROTECTED] made an utterance to the drakelist gang -- At 07:53 AM 2/12/2006, Ron Baker wrote: -- Hello Paul, to answer your question on substitute tubes, there are no substitutes for the 6JB6 tube. Actually, the 6GJ5 is spec'd identically with the exception of the supressor grid configuration (which is not a concern in the Drake apps). I've used them plug and play in several of my Drake stations and they work fine. John K5MO -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 267.15.6/257 - Release Date: 2/10/2006 -- 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] 6JB6 substitutes
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Paul - The 6GJ5 is a good replacement. It's _identical_ to the 6JB6, with the exception that the suppressor grid is tied to the cathode internally in the GJ. This is of no concern in the grounded cathode Class AB1 operation of the Drake finals. It doesn't appear to affect the neutralization. Some have reported reduced gain on 10M, but I haven't seen that problem.. There is variation among brands, especially on 10M. The name brands don't seem to be a problem, i.e., Sylvania, RCA, GE and Zenith (appear to be Sylvania by construction) all work fine. The Standard and Raytheon brands do NOT work, at least in my experience with several samples. The gain drops dramatically on the higher bands, to only 10-15W on 10M, and not much better on 15. They will plug in directly in the T-4(any) transmitters, and (probably) in the TR-(any) series, although I haven't tried them there. 73, Garey - K4OAH Atlanta Drake C-Line Service Manual http://www.k4oah.com Paul wrote: I see where 6JB6's can be substituted with 6KM6 sweep tubes.Has anyone tried these? Are they a good sustitue or not? Do they physically fit in the RF cage? Tnx 73 AD3G -- 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] 6JB6 substitutes
Found Frank's new site: http://k5dkz.home.comcast.net/ Have fun, Dan/N4VET
Re: [drakelist] 6JB6 substitutes
Gary Poland [EMAIL PROTECTED] made an utterance to the drakelist gang -- I have not had any luck with using the 6JG5's in place of the 6JB6's. I could neutralization on 15 and 10 meters though I only tried a few RCA's and GE's. Also some of the 6JG5's are too tall. 73, Gary -- 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] 6JB6 substitutes
Gary Poland [EMAIL PROTECTED] made an utterance to the drakelist gang -- Sorry I meant to say I COULDNT NEUTRALIZE on 15 and 10 meters. Guess I should proof read my emails. 73, Gary -- 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 --
