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[Amps] [ham-amplifiers] Fw: [yccc] Followup: KM1H
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We are always learning! Sent from the all new AOL app for iOS
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Fw: [yccc] Followup: KM1H
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Sent from the all new AOL app for iOS Begin forwarded message: On Tuesday, December 26, 2023, 3:43 PM, Rudy Bakalov <r_bakalov@...> wrote: ----- Forwarded Message ----- From: Doug Grant <dougk1dg@...> To: YCCC <[email protected]> Sent: Tuesday, December 26, 2023 at 03:38:10 PM EST Subject: [yccc] Followup: KM1H Since nobody had any direct info on Carl's status, I drove to his house and knocked on the door today, not quite sure what to expect. Carl's ex-wife answered the door and invited me in. She announced me to Carl, who then made his way down the stairs . We had a nice visit and yakked for about a half-hour. He knew me, and even asked how my "twin" (K1AR) was doing. He was unaware that his ham license had expired, but at age 83, sometimes events like that slip by. So now you know "...the rest of the story". 73, Doug K1DG
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The Subject is kind of vague but I have a AL-80B. I have no issues on 75-15m. The 15M Tuned Input is a little off, maybe they tuned it to 17M. On 10M when starting tune up process and I get to about 50Watts I smell a hot smell. 40 Watts of Drive,Grid Current is 85 and Plate Current is 350 Output Power is 490W NO SMELL But when I get to 50Watts I start smelling a HOT, Plastic Smell, the more drive I give it the worst it gets. @ 50Watts of Drive, Grid Current is 110, Plate is 378 Output is 615W Any Ideas where to start looking for this problem??? Next Problem on 160M 40Watts of Drive, Grid Current is 70, Plate is 300 Output power is 430W No Smell When I get to 70 Watts of Drive I smell a different smell, Like a component breaking down. When I key with 70Watts of Drive I see 148 of Grid Current that falls to 130 pretty fast. Plate current holds at 350 with Output power starting at 739 and dropping to 660 pretty fast as well. It smells almost like your heat does when you turn in on for the first time in the winter but its different that the 10M smell... Any Ideas? The other bands work perfect... Not Issue no matter how long I use it. Thanks for you help. Sorry if descriptions are off, any help will be appreciated. 73 K4MDI Scott
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Merry Xmas to all
Have a good one, fellas. Best wishes for a happy and safe 2024. Mni 73, John VK6JX
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12 KW CCS ON 160-15M...USING THE 3CX-6000A7... PART 9
Here, the paralleled pair of Jennings RJ2B output vac relays are installed.....along with the 7-16 DIN output connector. Also installed is the 1/2" silver plated tubing coil, used for 20 + 15m. Also installed is the hb 3/8" tubing coil, used for 80+40m. The hb cu discs are cut and installed for the vac tune and vac load caps. The hb 1/4" tubing coil (used for 160m) is wound, but not yet installed, nor the 100mm diam Draloric plate block cap. On the rear apron, you can also see the pair of 100 amp, superior electric ...'supercon connectors', used to terminate the cables for the 7.0 vac @ 78 amp fil supply. It's progressing pretty good. The entire B+ supply has yet to be built... but is a straight forward project, since it's already been done several times before. https://www.youtube.com/watch?v=ZdQU5HuonqA
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Good morning, all. I recently acquired a converted 6-meter amp that is named the SB-206. It was converted by KM1H in 2006 from an SB-200 and it actually works very well. I have been very carefully tuning it with the max output method, which is the only way I can do it. The "manual" is a single sheet of paper with minimal instruction. I have tried to contact the builder, but his email bounces and his phone is disconnected. Has anyone on this reflector had one of these? If so, I would like to know how you tune your amp properly. I am trying t avoid killing it with improper tuning. 73 Warren / NI5L
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commander 2500 amps
Can anybody with a two tube 2500 Commander ( those with grid trip protection) tell me at what grid current their amp trips out at? I have an older model in for work and it doesn¡¯t have a grid trip. I put a trip circuit in it and wanting to adjust the trip point to factory specs. Schematic had a notation 65ma max., but that might be for a single tube. If anyone can let me know what their¡¯ sis set to I¡¯d like some input. Thanks, Lou Sent from the all new AOL app for iOS
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I have recently acquired a Ten-Tec Centurion model 422 that is in very nice condition, but has a blown up bandswitch and the plate tuning capacitor was arced. I might be able to salvage the capacitor, but the bandswich will need to be rebuilt or replaced. If anyone has a switch/parts and/or a capacitor please contact me off list to let me know what you have.
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Henry roller inductor
I have a bad roller wheel on a 3K roller inductor. Anybody have a replacement or know of a replacement? Lou Sent from the all new AOL app for iOS
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AL-80B cooling
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Hi all, I'll condense this. A friend just got this AL-80B that had at one time melted a filament tube pin. The tube socket, the type that the socket is on a circuit board, was burned pretty badly. He got a new ceramic socket. I did what I needed to do to install it including getting the grids grounded, socket properly mounted etc. Amp works fine now but I noticed the cooling fan is basically silent and seems to barely spin. When holding my hand on the output vent I barely feel any air movement. I've never worked on one of these 80B's before so I don't know what's normal, however I feel this isn't moving nearly enuff air. I know this is hard to put into words but can anyone give me some kind of idea of how much air can be felt blowing out of the vent? I know the fan worked normally at one time because the inside of this amp was full of dust etc! Actually it was disgusting! It took me quite a while to get it clean. Thanks all. Bob W4JFA
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Replacement 3-500ZG
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Hello Group, I could use your help! Looking to pick up a 3-500ZG replacement for my AL-80B. My choices are: RF Parts Company: 3-500ZG (6-month warranty). 250$ (China) DX Engineering: Penta Labs RF Vacuum Tube 3-500ZG (no warranty listed). 300$ (assume China?) DX Engineering: Ameritron 3-500Z Replacement Power Tube (All products manufactured by Ameritron have a one-year limited warranty) 360$ (assume China?). Both vendors have always been reliable for me so my question: Is the Ameritron tube worth the additional $$ or is it branding? Is the Penta Tube worth the additional $$ What would be the best replacement? (sorry for writing a novel) Thanks in advance! 73 K5AKM - Dave
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Hopefully someone will help me out. I have 3 LD-4513 Traveling Wave Tube amplifiers. These I think operate around 2400MHz. I would like to get some information on them. A search on Google doesn't seem to come up with anything on this particular device. 73, Clint, VE3CMQ
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12 KW CCS ON 160-15M...USING THE 3CX-6000A7...Part 8.
Here is Part 8. The vac tune cap is installed vertically. The vac load cap is also installed vertically. And both have right angle drives. The massive model 90 bandswitch, made by multi-tech industries is also installed. The bandswitch is huge at 9" tall x 7" across. Contacts rated at 40 amps @ 20 kv. That '40 amp' rating is at 60 hz... and NOT RF freqs. Scott modified the switch by adding another identical set of contacts on the other side of the ceramic wafer, then paralleling the contacts. So it's now a 80 amp switch. It's a progressively shorting switch, so all un-used taps are shunted out. https://www.youtube.com/watch?v=ngYUTerziyY
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Ameritron AL-80 (Not A or B)
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All, Question for the group. I am working on an Ameritron AL-80 (not A or B). When tuning it up I run out of load. I max the load cap out at zero on all bands. (fully meshed/max capacitance). It behaves the same on a two different dummy loads so I believe it to be an issue with the amp. Before I add another doorknob across the load cap, I figured I would ask the group for other ideas. -- 73 Nick KC0YKO
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Anybody know whether there is an active Alpha amplifier group anywhere? I have a cupla questions about the AE9K monitor program for Alpha amps. TNX, Steve K0XP
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12 KW CCS ON 160-15M...USING THE 3CX-6000A7... PART 7
Here is part 7. The 160-15m manually tuned, tuned input is now complete. And yes, the input swr is dead flat across each band . https://www.youtube.com/watch?v=ev-648v_G0I
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12 KW CCS ON 160-15M...USING THE 3CX-6000A7... PART 6
Here is part 6, where the manually tuned, tuned input is almost complete. https://www.youtube.com/watch?v=_V8om_cRk-o
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12 KW CCS ON 160-15M...USING THE 3CX-6000A7... PART 5
Here is part 5, with the manually tuned, tuned input + input RJ1A vac relay, input coax etc. https://www.youtube.com/watch?v=sk-nmCjWa7I
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12 KW CCS ON 160-15M...USING THE 3CX-6000A7... PART 4
Here is part 4, where the fil choke is installed, rated to handle the 78 amps CCS of fil current....and work down to 160m. https://www.youtube.com/watch?v=UWR39bxa_64
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Collins transformers for the 30L-1
Bill K3HZP, Contact Heyboer, they have all the PWDahl specs and can build a PWDP13170 cheaper than a rewind. They did a Globe King 500A modulation transformer for me and it's great. 73 Bill N4LG At 12:29 PM 12/10/2023, Nick Jones KC0YKO wrote: >Nationwide radio has a good selection of Collins transformers but >it looks like they currently do not have one for the 30L-1. > >Peter Dahl makes a replacement p/n > >PWDP13170 > > > >-- >73 Nick KC0YKO >
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Sat 8:39am
Sat 8:39am