[Drakelist] FS-4 Synthesizer Dail lights intermittent
Hello to the group. My FS-4 Synthesizer dials lights are intermittent. They all work for awhile, then all go out at the same time, then come back ON all at the same time. I have checked the wires and solder joints for condition. No problems found. The synthesizer works normally even with this problem. Thanks for your consideration. Doug ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] K4OAH CD's
I too may sound like a broken record, but I find I use Garey's CD's more than any other reference I have in the shack. Fine pieces of work in each one!!! When is the TR7 comprehensive one coming out Garey??? HI HI 73, Don, WB5HAK___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] K4OAH CD's
I agree Bill. The facts are the facts! The new CD's on the 2C and 2-NT are also excellent. The time and effort taken to compile this information is awesome, and serves to keep our Drake equipment running. Of course, I take advantage of Garey's kind advice too. 73 Mark N5KAE > >From: Bill Scott >To: Drakelist@zerobeat.net >Sent: Thu, September 30, 2010 3:39:02 PM >Subject: [Drakelist] K4OAH CD's > > >I don't want to sound like a broken record, but if you don't own one of >Garey's >CD's for your Drakes your really missing the boat. I am not a tech, but do >like to keep my Drakes running myself without the need to send them out to >someone else. In the past two months my TR4C has had two problems both of >which I fixed myself with Garey's advice and being able to refer to his CD >giving detailed HI-RES pictures of the components of the Drakes. Everything is >labeled and easy to find. I was able to identify the component I needed to >check and make the necessary repairs. I owned the CD for my Drake twins, which >I >sold and one for my TR4C. I just wish he would produce one for my Collins >KWM-2A. The older radios are upwards of 60 years old and things are going to >go >bad, its fun and very rewarding to be able to fix things yourself even if you >are not a qualified tech. > >Bill, nm4k___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] Drake 2C Matching Speaker
Looking for a Mint 2cs matching speaker for my 2c.. contact augie... 8604805690 tnx ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] K4OAH CD's
I don't want to sound like a broken record, but if you don't own one of Garey's CD's for your Drakes your really missing the boat. I am not a tech, but do like to keep my Drakes running myself without the need to send them out to someone else. In the past two months my TR4C has had two problems both of which I fixed myself with Garey's advice and being able to refer to his CD giving detailed HI-RES pictures of the components of the Drakes. Everything is labeled and easy to find. I was able to identify the component I needed to check and make the necessary repairs. I owned the CD for my Drake twins, which I sold and one for my TR4C. I just wish he would produce one for my Collins KWM-2A. The older radios are upwards of 60 years old and things are going to go bad, its fun and very rewarding to be able to fix things yourself even if you are not a qualified tech. Bill, nm4k ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] 6JB6 vs.6JB6A
Upgrading to real RF-service tubes (6146's come to mind :) kinda pales when compared to that kind of mod. Curt LEE BAHR wrote: Many years ago, just before Drake stopped accepting TR-4 s for repair, my neighbor, WA5VGO sent his TR-4 to Drake for some repair. The radio came back with three different final tubes then when shipped to Drake. One of the three new tubes was as you described. A sweep tube with a printed circuit on the bottom changing the pin out of the tube. I don't know if it was a 6JM6 or not. However, the tube was put in there by Drake. Also, the three new tubes were taller then original and Drake had dimpled the top tube cage cover to accommodate the extra height of the new tubes. Strange indeed, but the radio worked just fine with these tubes. Lee, w0vt ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] 6JB6 vs.6JB6A
Many years ago, just before Drake stopped accepting TR-4 s for repair, my neighbor, WA5VGO sent his TR-4 to Drake for some repair. The radio came back with three different final tubes then when shipped to Drake. One of the three new tubes was as you described. A sweep tube with a printed circuit on the bottom changing the pin out of the tube. I don't know if it was a 6JM6 or not. However, the tube was put in there by Drake. Also, the three new tubes were taller then original and Drake had dimpled the top tube cage cover to accommodate the extra height of the new tubes. Strange indeed, but the radio worked just fine with these tubes. Lee, w0vt Hello! Just to complicate a bit more this subject ;-), some years ago I worked on a TR-4C which had 6JM6 tubes on it. You can read about that here: http://jvgavila.com/dktr4c_1.htm They had a professional-looking adaptor on their bases but, definitely, worked. And were labeled as 6JB6A! So it seems that, with some imagination, you can get a Drake transmitter working with slightly different tubes. Of course, I would stick with 6JB6 while they last. Regards, JOSE -- 73 EB5AGV - JOSE V. GAVILA - IM99sm La Canyada - Valencia(SPAIN) ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] 6JB6 vs.6JB6A
Boy that was the first time I posted to the list. Thanks for all the info Mike, KB1EZL ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR4C filters
I guess it must be old age but I cannot figure out which end of the filters is the input and which is the output. Alot of the confusion is caused by the confusing switch S7F&R shown in the schematic. I am inclined to believe that the below chassis end is the input but definitely not certain. Please help a brain dead old @#$%. TNX ES 73, Dick KF4NS St Petersburg, FL 33714 USA Keep The Glow! ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] 6JB6 vs.6JB6A
Yes, I really should do that, John. Bob was a Collins engineer and had many interesting experiences. I'll put that on the "to do" list. 73, Don, WB5HAK___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] 6JB6 vs.6JB6A
Garey, A TR-4 PA cage ( without the top cover installed ) is 3 3/8 inches tall. I have had good luck with GE's, Zenith, RCA, and Sylvania's of course. I hadn't seen any that were too tall, at least not yet, HI HI. The 6GJ5's are worth a try if you can find they cheap. I have a few that came from hamfest tube caddies. No one had grabbed them thinking they were of no use. Most tube caddies are picked through before I get to them. 73, Gary ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] 6JB6 vs.6JB6A
6JB6's can be matched with a Drake transmitter. Set the bias on the AC-4 and leave it be. Then measure the voltage drop across each cathode resistor with the PTT keyed, no mic. Use ohms law to figure the current of each tube. You probably would want to check the resistance of each cathode resistor first. 73, Gary___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] 6JB6 vs.6JB6A
?A comment regarding the height of various tube brands: A few years back, I bought a new set of 6550 finals for a CE 100V transmitter I was restoring. Unfortunately, they were too tall for the final cage. When I called the company I bought them from (Antique Electronic Supply in Arizona), they were extremely helpful and called me back after measuring the height of each of the various brands of 6550s they had in stock. Only one of the current manufacturers (Svetlana at that time) had the same height as the original tubes and AES happily exchanged my tubes for a pair of those. So, if you have problems with the physical size of any tube substitutes, it may be worth a call to AES to see if they have a brand that will fit. 73, Floyd - K8AC - Original Message - From: "Garey Barrell" To: "drakelist" Sent: Thursday, September 30, 2010 9:10 AM Subject: Re: [Drakelist] 6JB6 vs.6JB6A Gary - I have run into the size problem also. The RCA manual specifies outline 18A and 32 for the 6GJ5 and 6GJ5A respectively. As discussed yesterday, I have also seen 6JB6(A) that were too tall, but not of the 'four' brands. Do you have a transmitter open where you can measure the ACTUAL internal height of the cage. I've done it before, but can't find the info. I have NOT run into the failure to neutralize though, but I stick to the 'four'. Some 6JB6(A) of off brands will not neutralize, and I assume the GJ's that fail are made by the same manufacturer! It's perhaps possible to neutralize these by adding or subtracting the neutralizing capacitance, but I figure if they need that, then there may well be something else that could cause trouble later. Bottom line is these are 15 kHz tubes, NOT 30 MHz tubes.! 73, Garey - K4OAH Glen Allen, VA ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] 6JB6 vs.6JB6A
I have both, a B&K emisions tester and a Hickok 6000A transconductance tester. The emisions tester is useless for testing 6JB6's beyond shorts or open filaments. Over the years I kept most of the 6JB6 pulls from my Drakes and others I repaired. With the Hickok I was able to go through them and pickout the ones with some life left and match them up. Its amazing how unevenly some pairs ( or three's ) aged and weakened. I suggest you buy tubes from RF Parts, Antique Radio Supply, Tube Depot, or SND. Do not buy used 6JB6's. 73, Gary___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] 6JB6 vs.6JB6A
Hello! Just to complicate a bit more this subject ;-), some years ago I worked on a TR-4C which had 6JM6 tubes on it. You can read about that here: http://jvgavila.com/dktr4c_1.htm They had a professional-looking adaptor on their bases but, definitely, worked. And were labeled as 6JB6A! So it seems that, with some imagination, you can get a Drake transmitter working with slightly different tubes. Of course, I would stick with 6JB6 while they last. Regards, JOSE -- 73 EB5AGV - JOSE V. GAVILA - IM99sm La Canyada - Valencia(SPAIN) Vintage Radio and Test Equipment... http://jvgavila.com RadioRepair BLOG... http://radiorepair.blogspot.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] 6JB6 vs.6JB6A
Gary - I have run into the size problem also. The RCA manual specifies outline 18A and 32 for the 6GJ5 and 6GJ5A respectively. As discussed yesterday, I have also seen 6JB6(A) that were too tall, but not of the 'four' brands. Do you have a transmitter open where you can measure the ACTUAL internal height of the cage. I've done it before, but can't find the info. I have NOT run into the failure to neutralize though, but I stick to the 'four'. Some 6JB6(A) of off brands will not neutralize, and I assume the GJ's that fail are made by the same manufacturer! It's perhaps possible to neutralize these by adding or subtracting the neutralizing capacitance, but I figure if they need that, then there may well be something else that could cause trouble later. Bottom line is these are 15 kHz tubes, NOT 30 MHz tubes.! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-B, C-Line& TR-4/C Service Supplement CDs Gary Poland wrote: I own a few pairs of 6GJ5's, one pair is too high to fit into the 4-line PA compartment. Neither set of tubes would neutralize in a T-4XC. I havent tried adding or removing capacitance to the neutalizing trimmer to see if I could get them to work. Just a heads up. 73, Gary ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] 6JB6 vs.6JB6A
I own a few pairs of 6GJ5's, one pair is too high to fit into the 4-line PA compartment. Neither set of tubes would neutralize in a T-4XC. I havent tried adding or removing capacitance to the neutalizing trimmer to see if I could get them to work. Just a heads up. 73, Gary ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] 6JB6 vs.6JB6A
Hi Doug Yes, as I mentioned, there is no effect in the Drake transmitter. To quote Garey some years ago: NO modifications are needed to either the T-4(any) or the TR-4(any) to > use the 6GJ5s. > > Pin 3 in the Drake 4 Line transmitters is the cathode of the final > tubes. Pin 8 in the transmitters is grounded at the socket. > > With 6JB6s, K is connected internally to Pin 3, and G3 is connected > internally to Pin 8. > > With 6GJ5s, K AND G3 are connected internally to Pin 3, AND there is > _NO_ connection to Pin 8. > > So everything works the same, except G3 is connected directly to K > rather than via a 15 ohm and 3.3 ohm resistor. > > The only difference is the interelectrode capacitance, which is small > enough (0.5 pF) that the neutralization circuit is able to take care of it. I stocked a lifetime supply of these tubes NOS at $2 and $3 ea some years ago.and they are to me, indistinguishable from the JB6s. John k5mo At 02:25 AM 9/30/2010, Douglas wrote: >Date: Wed, 29 Sep 2010 20:49:08 -0500 >From: "Curt" >Subject: Re: [Drakelist] 6JB6 vs.6JB6A >To: >I'll never again buy vacuum tubes off of the internet, after buying from a >regular "store" on the auction site two "matched" 6JB6s, both soft as >pillows and useless above 40M. Of course, everything there is always >"as-is". I'll also never buy anything from a big tube seller in Florida >who >is a small-time liar and crook. Only bonafide companies for me, the >products are no more expensive, and at least its a big outfit ripping me >off. >Good to know that a 6GJ5 is equal to a 6JB6, surprised had never read that >before. Unfortunately, maybe most tubes sold are pretty much worn out. >Even most of the companies selling tubes draw the line at providing much >warranty for sweep tubes ( 10 days conditional from the outfit I use a >lot ). >Curt KB5JO -- A 6GJ5 is not quite equivalent to a 6JB6. There is a pin difference. That caused problems with National transceivers such as the NCX-5 and the NCX-3 that used 6GJ5's. The 6GJ5 internally ties its suppressor grid to the cathode, the 6JB6 does not. The Nationals used one base pin as a tie point, that had to be separated out when tube types were swapped. Since I don't know how the Drakes are wired, I'm not sure if a similar problem exists. There are other minor differences between the tubes. 73, Doug/WA1TUT ___ 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
