Re: [drakelist] WTB Solid tube solid state tubes for B and C line
Jim Shorney [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Sun, 26 Nov 2006 20:30:29 -0800, Jim Pruitt wrote: One of the individuals ( N9OO )on this list sells a blue LED light bar for the TR7 at http://home.wi.rr.com/n9oo/products/tr7lamp/d7lamp.html . I just looked, very cool stuff! He has sets for the 4-line as well. When I did my TR7, I just used RadShack LEDs and old lamp bases, and brewed up something ugly but functional. His TR7 kit looks quite elegant and the results are similar to (if not better) than mine. It's just as blue, that's for sure. The icing on the cake, though, is Willi Rass' blue LED readout kit. I was totally floored by how cool it made my TR7 look, pics can't truly do it justice. I don't have the URL handy, but he's in the Drakelist forums or findable through Google. I have had more than one comment from people who saw the rig at field day this year, about how seeing that cool blue radio was the highlight of the event for them. And most of them weren't even Drake afficionados -Jim (did I mention blue is COOL!?) -- TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A - all vintage, all the time! -- 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] WTB Solid tube solid state tubes for B and C line
Jim Pruitt [EMAIL PROTECTED] made an utterance to the drakelist gang -- I am again trying to find some solid tubes. I have seen none advertised on here for quite some time and wonder if anyone has any lying around that they would like to part with for the B or C line. Thank you. Jim Pruitt -- 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] WTB Solid tube solid state tubes for B and C line
Jim Shorney [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Sun, 26 Nov 2006 16:45:52 -0500, neil wrote: Also - anyone tried using bright blue LEDs instead of bulbs + blue filters for the dial and meter illumination? My filters are shot... Yes. You should be able to find comments in the list archives by myself and others regarding blue LEDs. See also here: http://www.146760.net/cgi-bin/pro/emalbum.cgi?c=show_thumbs;p=Field%20Day/2006%20-%20Photos%20by%20NU0C;i=16;pg=2 (long URL, watch for line wrap). The first all-blue TR7 - meter dial lamps, digital display, ALC and RV7 LEDs have all been replaced with blue LEDs. The coloe is more blue than the blue-aqua color of standard lamps, and is quite striking. -- TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A - all vintage, all the time! -- 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] WTB Solid tube solid state tubes for B and C line
This is my own opinion I always heard the solid tubes(at the time) were a compromise. I had heard they got pretty hot and at the time didn't offer any advantages over the tubes they replaced. Today, some of the 3rd mixer stuff is better replaced with Sherwood mods actually. I also heard they didn't sometimes work in the circuit as well as the original tube. This is all hearsay, since I have no experience with them. I think they were pretty rare too. Plus that was 30 yrs ago so there may be a lot of better ways to improve the circuits now. 73 Mark W0NCL
Re: [drakelist] WTB Solid tube solid state tubes for B and C line
neil [EMAIL PROTECTED] made an utterance to the drakelist gang -- Jim Pruitt wrote: Jim Pruitt [EMAIL PROTECTED] made an utterance to the drakelist gang -- I am again trying to find some solid tubes. I have seen none advertised on here for quite some time and wonder if anyone has any lying around that they would like to part with for the B or C line. Speaking of which... I've wondered how hard it would be to make some things like this (assuming, for discussion, that you could get some appropriate 7 or 9 pin bases to build on)? Diodes are obvious, and I suppose an FET could be rigged to work as a triode, but how would you replace a more complex (multi-grid) tube? Dual-gate mosfet or some combination of parts? Also - anyone tried using bright blue LEDs instead of bulbs + blue filters for the dial and meter illumination? My filters are shot... Neil KX2Y -- 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] WTB Solid tube solid state tubes for B and C line
kbgluxford [EMAIL PROTECTED] made an utterance to the drakelist gang -- Neil, I have used bright blue LEDs in my R4A. I took out the white reflector and re sprayed it white. I then shone the blue LEDs (two of them) into the quasi parabolic diffuser. Suited me. 73 Kevin VK3DAP / ZL2DAP neil wrote: neil [EMAIL PROTECTED] made an utterance to the drakelist gang -- Jim Pruitt wrote: Jim Pruitt [EMAIL PROTECTED] made an utterance to the drakelist gang -- I am again trying to find some solid tubes. I have seen none advertised on here for quite some time and wonder if anyone has any lying around that they would like to part with for the B or C line. Speaking of which... I've wondered how hard it would be to make some things like this (assuming, for discussion, that you could get some appropriate 7 or 9 pin bases to build on)? Diodes are obvious, and I suppose an FET could be rigged to work as a triode, but how would you replace a more complex (multi-grid) tube? Dual-gate mosfet or some combination of parts? Also - anyone tried using bright blue LEDs instead of bulbs + blue filters for the dial and meter illumination? My filters are shot... Neil KX2Y -- 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 --
Re: [drakelist] WTB Solid tube solid state tubes for B and C line
Sartori was a consulting engineer at Texas Instruments when he wrote the article. In those days it was possible to have a semiconductor company manufacture custom devices on a small lot or sample basis. Therefore, he had access to a gold mine of resources few others had. However, custom devices were generally derived from an existing devices with some specifications differences. At some point in time, Sartori left TI and pursued other venues. I haven't looked at specific devices but it seem that with advances in component technology, it might be possible to improve or replace the original circuits. It would be a race against time however as the whole semiconductor industry is going to strictly surface mount devices in ever smaller packages. Thre could be even more opportunities as the package sizes change but the question is would an average Ham be able to handle it? -- Original message -- From: Jim Pruitt [EMAIL PROTECTED] Jim Pruitt made an utterance to the drakelist gang -- Hello Neil. First, there was an article by SARTORI (the guy that later produced the solid tubes commercially) in a 197x (1975 or 6 I think) QST article and was written specifically for making solid state tubes for the Drake B and C line. I looked very hard at it at the time. I had a friend that was an executive for Tektronix. He pointed out to me that the specific transistors were not that hard to find but that Sartori had spec'ed the hard to find cases (TO220) for the transistors he used. I was recently told that Sartori did that because he worked in the industry and got the transistor maker to make them special for him so most people (including me) would have a hard time finding them in the cases he recommended in the article. I recently ran across a mod on some site (I thought it was WB4HFN but maybe not) where the article took the 6EV7 vox tube (for the T4XB) (found it-- http://www.geocities.com/maxmartin3/drake/tr4xc.html ) which used simple 2N5485 and MPSA42 along with a string of 4 43v transcient voltage suppressor diodes, a 12v zener and a 1N4007. My T4XB used to and still eats that particular tube. The regulator tube for the T4 was even simpler but used a 150v (I think) zener diode but those are getting hard to find now but they are out there. Anyway, there have been articles about making solid state replacements for tubes. The one in QST that I mentioned above and I also remember an article in Ham Radio Magazine that did the same thing but aimed at the R390 or KWM2 (can not remember which but a Collins radio). Those transistors were even harder (for me) to find. I think the article was in the early 80's. I purchased some blue LED builbs in #47 and #53 style holders from www. superbrightleds.com ( http://www.superbrightleds.com/BA9S6_specs.htm ) in their BA9 and BA7 models. The price was not bad. I think around $3 per bulb but do not remember for sure. One of the individuals ( N9OO )on this list sells a blue LED light bar for the TR7 at http://home.wi.rr.com/n9oo/products/tr7lamp/d7lamp.html . The filter material is not hard to get WA9TGT sells them ( http://www.wa9tgt.com/Dial_Filter_Page.html ) and are quite cheap ($10 for 4 sets) so if you do not have a local source these guys can sure help you out. I have not found a source for solid tubes or the parts to make them, at least not on a reliable scale. Thank you. Jim Pruitt - Original Message - From: neil To: DrakeList Sent: Sunday, November 26, 2006 1:45 PM Subject: Re: [drakelist] WTB Solid tube solid state tubes for B and C line neil made an utterance to the drakelist gang -- Jim Pruitt wrote: Jim Pruitt made an utterance to the drakelist gang -- I am again trying to find some solid tubes. I have seen none advertised on here for quite some time and wonder if anyone has any lying around that they would like to part with for the B or C line. Speaking of which... I've wondered how hard it would be to make some things like this (assuming, for discussion, that you could get some appropriate 7 or 9 pin bases to build on)? Diodes are obvious, and I suppose an FET could be rigged to work as a triode, but how would you replace a more complex (multi-grid) tube? Dual-gate mosfet or some combination of parts? Also - anyone tried using bright blue LEDs instead of bulbs + blue filters for the dial and meter illumination? My filters are shot... Neil KX2Y -- Submissions: drakelist@www.zerobeat.net Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly
