Select pages by clicking on the individual page number or manual section from the menu on the left. Linear amplifiers being an avid dxer i have owned a linear amp for several decades, yes i have upgraded at various times and during the course of several decades have either built, or serviced several models of linear amps. This allinone board provides a softstart, softkey and user adjustable biasing for the drake l4b amplifier. Miamisburg, ohio, build 1966, 4 pictures, 2 tubes, united states of america, schematics, semiconductors, rf radio. Yeah, i have been around the block a few times with just about every vintage amplifier ever made. Drake l4b power supply harbach electronics kit installation. That could be lowered but that was what drake set it at with zero bias. For those of you interested in your first, or used amp hopefully my experiences will be helpful in your choice. The txrx switching in the linear amplifier is controlled by switching components in the ft2000d transceiver. Back to linear amplifiers next linear last modified 20110918 drake l4b.
Harbach electronics, llc your worldwide source for. Drake l4b l 4 b l4b pdf user manual for drake l4b l 4 b l4b. The drake l4b amplifier was designed and built in the middle 1960s as a two piece unit. Place a towel or protective covering on the work surface and place the rf deck on the surface top side down. L drake l4b hf amplifier for saledrake l4b with l4b power vers 3mhz to 30 es with manaul copy beter than new again non smoker user. I am going to operate this amplifier with an out board qsk switch and bias control. It covers 80, 40, 20, 15 and 10 meters 10 meters not available on late production. All frequencies 305 to 30 mhz may be covered with some re alteration of the input circuit. The other side of the ycable connects directly to a ha5 vfo. The voltages present in this amplifier are lethal, and can cause serious injury or death. The l4b keydown no drive idle current is pretty high by current standards no pun. The drake usually has about 2650vdc on the plate in ssb and to bring that down to about 160ma it takes about 3 to4 volts. About l4b 160m mod the resource is currently listed in in a single category. I have the manual, extra bulbs, an antenna relay, and all connecting cables b pair of brand new eimac 3500z tubes.
While it might have been possible for him to obtain permission to operate from his small apartment there, he chose not to deal with the challenges this would. Drake software users manual about your drake software users manual tax year 20 5 1 introduction thank you for choosing drake software. The drake l4b amplifier is a dual 3500z amplifier that covers the basic 80 through 10 meter bands without specific warc band 60, 30, 17, and 12 meters coverage. Strict adherence to the safety precautions printed in the operators manual are necessary for your protection. Transceiver miscellaneous manuals not classified elsewhere drake tvi letter. L4b 1519 2 kw hf amplifier tuning the l4b to meet fcc requirements l4b spare parts list l7 1528 linear amplifier la7 audio amplifier ln4 ac line filter ln5 ac line filter lp100tv lp filter mc4 mobile wattmeter speaker ml2 2 mtr. The method is from the arrl handbook, the heath sb220, and drake folklore. Drake l4b l 4 b l4b service manual and specs drake l7 l 7 l7 service manual and specs.
For connections to the drake l4 or l4b linear amplifier, see the l4 or l4b instruction manual. Be prepared and able to communicate in case of emergency with the largest selection at. This is a great way to isolate the vfo from the l4b. My post of an l4b brought some inqueries about the bias mod, so ill provide it here. The r l drake model l4b linear amplifier offers continuous 2000 watts pep ssb, and watt dc, c w, am and rtty operation covering the ham bands 80 through 10 meters. The selected page will appear in this section of the screen. Looking at the above references and the eimac tube handbook confirms this. Currency all prices are in aud currency all prices are in aud. I use the unit to interface a drake 2nt with a drake l4b using a ycable at the output of the 2nts vfo key port. L 4 b l4b service manual and specs drake l7 l 7 l7 service manual and specs drake l75 l 75 l75 service manual and specs. Ronald lumachi, w2cqm you may recall that theres a chilling bit of dialogue in the classic movie poltergeist thats particularly memorable and remotely related to this posting. To open downloaded files you need acrobat reader or similar pdf reader program. This link is listed in our web site directory since wednesday jul 11 2012, and till today l4b 160m mod has been followed for a total of 460 times.
Rl drake l4b amplifier all in one, softstart, softkey. Many modern amplifiers now use much smaller plasticenclosed relays as you see, they have tiny solder pins as connections. Drake l4b l 4 b l4b power amplifier ham what is new links. Hammarlund heathkit henry radio hys i0jxx itb juma klm kohjinsha kris kuhne electronic k. The ampkeyer interface is a well designed unit and a credit to mikes technical skills. If you have some stuff that not is listed here you can donate this by contact mods. The l4b uses two 3500z or two 88023500z or two 8163 or two 3400z zero bias. If you do not feel comfortable making this modification yourself, take the amplifier to a. Recently sold used discontinued amateur amplifiers the drake l4b has watts pep power input on am, cw and rtty and 2000 watts input on ssb.
The drake team has been hard at work throughout 20 to help ensure that your firm has a successful, rewarding filing season in 2014. The tl922 instruction manual 1 and the tl922 service manual 2 are excellent ref. The openframe relay has been used in amplifiers dating back to the days of the drake l4b, henry amps, and heathkit amps. Johnson emperor emtron etoalpha falcon telecom frontier electric co. If you come into contact with any of these high voltages you may be killed. Drake l4b amplifier solid state relay modification the drake l4b is one of the highest quality amateur amplifiers ever made, a timetested design, ruggedly constructed, with top notch components. Note that there is a limit to the number of files you can download.
The drake l4b being a amplifier made in the 60s and 70s is a very good looking amp. L 4 b l4b service manual and specs drake l7 l 7 l7 service manual and specs drake l75 l. Ham radio basicshow i tune a linear amplifier duration. The main category is amateur linear amplifiers that is about hf amplifiers for ham radio use. Visit us online for more information or to download service manuals today. View and download drake l75 operators manual online. The drake l4b has watts pep power input on am, cw and rtty and 2000. User manuals, sony amplifier operating guides and service manuals. In this page you find schematic, users and instructions manuals, service manuals, technical supplement, leaf leads and other good stuff. Amplifier drake l4b conversion to 3cx1500 8877, by w2cqm amplifier drake. Service manuals, schematics, eproms for electrical technicians. The es4l4b is a combination softstartsoftkeybias board for the l4b amplifier. Harbach electronics is proud to announce the new es4l4b softstartsoftkeybias board from electronic specialties.
The relay circuit of the ft2000d used for this switching is capable of switching ac voltage of 100 volts at up to 300 ma, or dc. This included the l4b amplifier section and the l4ps high voltage power supply. Drake rf amplifier transformer replacement, by dino papas kl0s 092215. It was big, bulky, noisy, and very slow, but it could handle a decent amount of power, even with slightly higher swr. Drake l75 l 75 l75 power amplifier ham what is new links. V power supply with harbach power supply module also harbach soft start module replace bias 50k resistors. Drake l4b sm service manual download, schematics, eeprom. Get the best deals on drake l4b when you shop the largest online selection at. The amplifier was a very rugged amplifier and designed as a two final tube amplifier using the 3500 or similar tube. These manuals are available for download and free of charge. It is a real workhorse design that can stand modifications to improve performance and stability. Notes on rebuilding an sb220 linear amplifier brad rehm, kv5v salado, texas several months ago, i was asked to sell the radio equipment of an older ham that had moved to a retirement home.
1487 407 1338 849 46 1075 355 734 360 827 893 707 1251 198 1260 1184 1385 434 286 1416 894 374 1067 1389 987 711 425 1308 1038 1147 237 398