Drake l4b fan. 25 diameter fan motor.

Drake l4b fan The Drake L4B Amplifier was designed and built in the middle 1960's as a two piece unit. Jason N1SU suggested that I replace the stock fan with a Dayton 4C761. The VOM scaled to 5000VDC is showing about 3600VDC with no load. As it comes, the amplifier makes virually no noise. The stock fan is very quiet. Free returns The fan centerline is about ½” above the center of the fan inlet on > the back panel, but the fit is good enough that the fan functions properly. Power requirements are 115 VAC 50-60 Hz 30 amps or 230 VAC 50-60 Hz 15 amps. DRAKE LIMITED WARRANTY R. 5KV under load. Aug 19, 2024 · In the background is the partially completed Drake L4B/8877 deck. This included the (L4B) amplifier section and the (L4PS) high voltage power supply. The L-4B not only works very reliably, it is an example for how this type of equipment should be constructed. com. I purchased two 220 VAC chassis mount fans, attached little adhesive rubber feet over the fan screw holes, and then placed the two fans on top of the power supply blowing air away from the top of the power supply. The air pressure would blow up through the tube socket and around the tube and exit through the top of the chimney. I placed a muffin fan on top of the (separate) power supply to keep it cool. this amp is free classifed ads used surplus electronics Get the best deals on drake l4b when you shop the largest online selection at eBay. wb4hfn@twlakes. The original cooling fan design in the L4B was a 90 degree squirrel cage fan blowing air under the chassis through a channel and up through the tube sockets. Buy It Now. Free shipping on many items | Browse your favorite brands | affordable prices. It covers 80, 40, 20, 15 and 10 meters (10 meters not available on late production). Unable to repair the cracks, I set about finding a suitable replacement. Late last year I was complaining that the fan in my L-4B was not keeping the valves within their temperature rating with 50Hz mains, especially on CW at full power. DRAKE COMPANY or an authorized Drake service Replacement Fan Motor for Drake L-4B Donald Hellen. DRAKE COMPANY warrants to the original purchaser that this product shall be free from defects in material (except tubes and RF output transistors) or workmanship for ninety (90) days from the date of original purchase. After 30 or more years of service the L4B blower fan is starting to develop many issues due to age and deterioration. 82 ohm fuse with a proper glitch resistor in the HT supply of my L4-B, like y'all advised, I've been continuing to abuse my Drake L-4B amplifier on CW. This replacement fan is the same diameter, width, number of vanes and correct rotation. After 30 years of service, my L4B blower “fan” developed terminal cracks at the steel collar where it meets the plastic fan housing. The amplifier was a very rugged amplifier and designed as a two final tube amplifier using the 3-500 or similar tube. The L-4B uses two 3—500Z or two 8802/3-500Z or two 8163 or two 3-400Z zero bias Having replaced the 0. R. I finally got one of these units brought over to the UK by a work colleague. Opens in a new window or tab. I ended up getting a replacement fan on eBay and my 35 year old L-4B is nice and quiet again; was going to try the rebuild before I found the fan. Select pages by clicking on the individual page number or manual section from the menu on the left. The difference is in the shaft hub diameter. During the warranty period the R. L. V power supply with HARBACH power supply module also HARBACH soft start module Replace bias 50k resistors. Service & Repair and Refurbishing services are available for the Drake amplifiers and high voltage power supply. The 8877 is pictured with the teflonä chimney and an Eimac HR-8 heat dissipating plate cap machined to fit the larger 8877. Brand New. The fan is so quiet you almost can't hear it. Aug 26, 2024 · The original cooling fan design in the L-4B was a 90° squirrel cage fan blowing air under the chassis through a channel and up through the tube sockets. The high efficiency Class B Grounded Grid Circuit uses the new Eimac 3-500Z zero bias triodes. The “fan” in the L4B is actually known in the industry as a "blower Wheel. All frequencies 3. This L4B with the HB PS easily puts out 1500 watts (1900 watts max) on all bands. net : Drake Amplifier Service & Repair, L-4, L-4B, L-7, and L-75. The selected page will appear in this section of the screen. The original L4B won't do this because the HV is only 2. After selling my Henry 5K Classic, I purchased a mint condition L4B from a friend who had bought it new in the late 70's. All Messages By This Member #10698 > Message: 10701 > Date: 26/11/2013 3:52:07 Hello from COLD North (I hate to say that Alabama) I need a New fan for one of my L4b's the Squirrel cage actually the motors are both good but seeing a little bit of warp from time in the plastic. All frequencies 305 to 30 MHz may be covered with some re- alteration of the input circuit. Free shipping. 25 diameter fan motor. Until recently there was no known replacement blower fan for the L4 and L4B amplifier. Jul 31, 2014 · Drake L4/L4B Blower Fan Repair/Upgrade - WB4HFN Home Page EN English Deutsch Français Español Português Italiano Român Nederlands Latina Dansk Svenska Norsk Magyar Bahasa Indonesia Türkçe Suomi Latvian Lithuanian český русский български العربية Unknown E-mail me for more information on Drake radio repair & service, or refurbishing work. L DRAKE L4B HF Amplifier For SaleDrake L4B with L4B power supply. comes with manaul copy beter than new again non smoker user. My intent was to use the L4B until I decided on a replacement for the Henry 5K. DRAKE et Ps * FATE AMRERES Figure 1—71. . Here is a close-up view of the power supply area under the chassis. covers 3mhz to 30 mhz. L-4B amplifier pdf manual download. Unlimited document download and read ad-free! The R L DRAKE Model L—4B Linear Amplifier offers continuous 2000 watts PEP— SSB, and 1000 watt DC, C W, AM and RTTY operation covering the ham bands 80 through 10 meters. Drake L4/L4B Blower Fan Repair/Upgrade By Gene McCalmont, W5DDW After 30 years of service, my L4B blower “fan” developed terminal cracks at the steel collar where it meets the plastic fan housing. Hooking the fan on the regulated 12VDC side now kept the fan at a constant speed. Since the L4B uses chimneys and a pressurized chassis, the two 3-500Z tubes are adequately cooled even when running 1500 watts output. A high volume squirrel cage fan has been repositioned on the chassis . The original Drake fan fits on the 0. " Drake L4/L4B Blower Fan Repair/ Upgrade. 95. 2 to 30 Hooking the fan on the regulated 12VDC side now kept the fan at a constant speed. My plans quickly changed after using the L4B; its quiet operation, the nearly full legal output and ease of use made me an L4B fan! View and Download DRAKE L-4B instruction manual online. 73 - Dino KL0S k5fex 1850 INDICATOR INCANDESCENT LAMP 5VDC BULB B9 BAYONET 10PCS FOR DRAKE L4B. Model L—4B Linear Amplifier SPECIFICATIONS Frequency Coverage: Ham bands 80 through 10 meters. Unlimited document download and read ad-free! Drake L4/L4B Blower Fan Repair/Upgrade - WB4HFN Home Read more about blower, motor, bore, venturi, shaft and housing. I do recommend placing a fan on top of the external power supply to keep it cool. > The fan is quiet with no whine or rattle - only the reasonable sound of > moving air. That fan is louder than the amplifier's. Drake L4/L4B Blower Fan Repair/Upgrade - WB4HFN Home Read more about blower, motor, bore, venturi, shaft and housing. By: Gene McCalmont, W5DDW. > > > > I also eliminated the Drake 120V ALC circuit, added my own ALC provision, > directly grounded all six The Drake L-4B has 1000 watts PEP power input on AM, CW and RTTY and 2000 watts input on SSB. On the right side is the rectifier and filter capacitor making up the power supply with the large blue wire coming from the filament transformer at the bottom. Upgraded H. $13. rhl kjp ylqwm tdxy ruwac kzln cqspwa labhte qxpxlr oth