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When I formed the group, my intent was to cover all the MFJ related brands, but a group name would be too long to cover them all. This is a question about matching 811As without a tube tester with the intent of using them as spares in an Ameritron 811H amplifier. I do not have a tube tester but I am hoping to find someone in south central Ohio who does have one. I would like to find a way to test 811As without buying a tube tester if I can't find one nearby. And some tube testers don't do thorough tests anyway. Can you use an 811A in an amplifier circuit at low drive after neutralization to check tube parameters in order to match a set of 811As for use at higher power? I have an Ameritron 811H. Eventually I will replace these 811s with matched 572Bs. In the meantime, I have 9 spare 811As, Six were purchased together and appear to be from the same lot, from the same shipping box. Three others were given me when I bought the amplifier. I was told it's not all that important to match these, but I would think otherwise. I was hoping setting up a few in the amp, maybe just one, using low drive level, might give me what I need to know from either voltage or current measurements on the Ameritron's meters. Maybe there's a special rig I can build just for testing these and 572B tubes for this purpose? Thoughts? Donald KX8K

MFJ Items For Sale: TNC/Microphone Switch, Stereo Synthesizer, Original Boxes, and more . MFJ-1272 MX TNC / Microphone Switch This unit is made to go between your rig, your PK-232 TNC (or equivalent), and your microphone. It is a small unit with a mic jack on the front, plus a switch to switch between your mic and TNC. It saves a lot of wear and tear plugging and unplugging cables. The "MX" model has modular connectors for your microphone, in and out. This one works fine and looks like new. With paper work for $25. . MFJ-1501 Stereo Synthesizer This is a sort of odd unit. You can plug it in to the mono headphone or speaker jack on your rig. It will produce a stereo output that can be used to drive stereo speakers. It is quite useful to use with powered computer speakers. One can select one of two inputs. Separation is adjustable, as is volume. 12 Volt DC required. This one works fine, and looks like new. With manual for only $40. . Original Empty Boxes For Sale: All are original boxes that also include the inserts that came with them when new. Some may even have plastic bags. MFJ 200 BX Xtal Cal $3 MFJ 407 C Keyer $10 MFJ 564 Paddles $8 MFJ 870/872/873/874 Grandmaster SWR/Wattmeter MFJ 986 Large Ant Tuner $18 MFJ 1270 B TNC $10 MFJ 1284 M TNC Pgm $3 These are original boxes only. . MFJ-1313 Wall wart power cube Provides 12 Volts DC at 100 ma. It has an 1/8 inch plug on it. This one works fine and looks fine. $12 . I also have many other accessories available such as many different types of microphones, HTs, VHF and UHF rigs, HF and VHF/UHF antennas, connectors, miscellaneous accessories, etc. Just too many to list here. Please e-mail your requests. . Prices do not include shipping from Florida. Thanks. 73, Ken, W8EK Ken Simpson E-mail to W8EK@... or W8EK@... Voice Phone (352) 732-8400 . .

MFJ Items For Sale: Power Supply, TNC/Microphone Switch, Stereo Synthesizer, Original Boxes, and more . MFJ-4230 MVP Power Supply: The MFJ-4230 MVP is 25 Amps continuous and 30 Amps surge at 13.8 VDC. Voltage is variable from 4 to 16 volts. It is a compact switching power supply. The front panel features 5-way binding posts that allow easy access connections for your rig and station accessories. The back has two sets of Anderson Power Pole connectors. Cosmetically, I do not find a scratch on this one. Electrically, it works as it should. With paper work for only $100. . MFJ-1272 MX TNC / Microphone Switch This unit is made to go between your rig, your PK-232 TNC (or equivalent), and your microphone. It is a small unit with a mic jack on the front, plus a switch to switch between your mic and TNC. It saves a lot of wear and tear plugging and unplugging cables. The "MX" model has modular connectors for your microphone, in and out. This one works fine and looks like new. With paper work for $25. . MFJ-1501 Stereo Synthesizer This is a sort of odd unit. You can plug it in to the mono headphone or speaker jack on your rig. It will produce a stereo output that can be used to drive stereo speakers. It is quite useful to use with powered computer speakers. One can select one of two inputs. Separation is adjustable, as is volume. 12 Volt DC required. This one works fine, and looks like new. With manual for only $40. . Original Empty Boxes For Sale: All are original boxes that also include the inserts that came with them when new. Some may even have plastic bags. MFJ 200 BX Xtal Cal $3 MFJ 407 C Keyer $10 MFJ 564 Paddles $8 MFJ 870/872/873/874 Grandmaster SWR/Wattmeter MFJ 986 Large Ant Tuner $18 MFJ 1270 B TNC $10 MFJ 1284 M TNC Pgm $3 These are original boxes only. . MFJ-1313 Wall wart power cube Provides 12 Volts DC at 100 ma. It has an 1/8 inch plug on it. This one works fine and looks fine. $12 . I also have many other accessories available such as many different types of microphones, HTs, VHF and UHF rigs, HF and VHF/UHF antennas, connectors, miscellaneous accessories, etc. Just too many to list here. Please e-mail your requests. . Prices do not include shipping from Florida. Thanks. 73, Ken, W8EK Ken Simpson E-mail to W8EK@... or W8EK@... Voice Phone (352) 732-8400 . .

MFJ Items For Sale: TNC/Microphone Switch, Stereo Synthesizer, Original Boxes, and more . MFJ-1272 MX TNC / Microphone Switch This unit is made to go between your rig, your PK-232 TNC (or equivalent), and your microphone. It is a small unit with a mic jack on the front, plus a switch to switch between your mic and TNC. It saves a lot of wear and tear plugging and unplugging cables. The "MX" model has modular connectors for your microphone, in and out. This one works fine and looks like new. With paper work for $25. . MFJ-1501 Stereo Synthesizer This is a sort of odd unit. You can plug it in to the mono headphone or speaker jack on your rig. It will produce a stereo output that can be used to drive stereo speakers. It is quite useful to use with powered computer speakers. One can select one of two inputs. Separation is adjustable, as is volume. 12 Volt DC required. This one works fine, and looks like new. With manual for only $40. . Original Empty Boxes For Sale: All are original boxes that also include the inserts that came with them when new. Some may even have plastic bags. MFJ 200 BX Xtal Cal $3 MFJ 407 C Keyer $10 MFJ 564 Paddles $8 MFJ 870/872/873/874 Grandmaster SWR/Wattmeter MFJ 986 Large Ant Tuner $18 MFJ 1270 B TNC $10 MFJ 1284 M TNC Pgm $3 These are original boxes only. . MFJ-1313 Wall wart power cube Provides 12 Volts DC at 100 ma. It has an 1/8 inch plug on it. This one works fine and looks fine. $12 . I also have many other accessories available such as many different types of microphones, HTs, VHF and UHF rigs, HF and VHF/UHF antennas, connectors, miscellaneous accessories, etc. Just too many to list here. Please e-mail your requests. . Prices do not include shipping from Florida. Thanks. 73, Ken, W8EK Ken Simpson E-mail to W8EK@... or W8EK@... Voice Phone (352) 732-8400 . .

MFJ Items For Sale: TNC/Microphone Switch, Stereo Synthesizer, and more . MFJ 422 B electronic keyer This keyer is made to go on the back of a Bencher Paddle. It includes sidetone, and has adjustments for volume, tone frequency, and weighting, as well as speed. It will key either positive or negative voltages, and is powered by an internal 9 V battery, or external 5 to 9 volt supply. This one works 100%, and looks great also. With paper work for $45. . MFJ-1272 MX TNC / Microphone Switch This unit is made to go between your rig, your PK-232 TNC (or equivalent), and your microphone. It is a small unit with a mic jack on the front, plus a switch to switch between your mic and TNC. It saves a lot of wear and tear plugging and unplugging cables. The "MX" model has modular connectors for your microphone, in and out. This one works fine and looks like new. With paper work for $25. . MFJ-1501 Stereo Synthesizer This is a sort of odd unit. You can plug it in to the mono headphone or speaker jack on your rig. It will produce a stereo output that can be used to drive stereo speakers. It is quite useful to use with powered computer speakers. One can select one of two inputs. Separation is adjustable, as is volume. 12 Volt DC required. This one works fine, and looks like new. With manual for only $40. . MFJ-1313 Wall wart power cube Provides 12 Volts DC at 100 ma. It has an 1/8 inch plug on it. This one works fine and looks fine. $12 . I also have many other accessories available such as many different types of microphones, HTs, VHF and UHF rigs, HF and VHF/UHF antennas, connectors, miscellaneous accessories, etc. Just too many to list here. Please e-mail your requests. . Prices do not include shipping from Florida. Thanks. 73, Ken, W8EK Ken Simpson E-mail to W8EK@... or W8EK@... Voice Phone (352) 732-8400 . .

First, the new pricing structure for NEWLY formed groups on groups.io beginning January 18, 2021. Basic (free) groups formed on or after that date stay free *up to 100 members*. After that, it will need to be upgraded to a premium group. Premium groups ($220/year) are good up to 400 members, after which a per-member fee ($.05 per month or $0.55 per year) is added to the $220 per year premium group fee. That will bring a burden on some new groups, so I created some more ham groups that may grow, or flounder, but I wanted to beat the deadline so those groups will not be charged extra fees, or any fees, for that matter. If they take off and are useful, that will be great. If they flounder, I might just delete the group if members agree, or if there are no co-owners by the time I review whether the group is worth keeping. If you were thinking of creating a group for one of your interests, THIS IS THE TIME TO DO SO before the new pricing structure goes into effect. If you need help with that, email me *privately* and if I'm not overwhelmed with requests, I will try to help. You must be willing to assume group ownership as I will leave the group after creating it and you've been made a group owner. If you need help getting started with the group, I can hang around for a short while and direct you to documentation on how to run a group. As for the new groups I created last evening, I will list their web addresses below. Please contact me *privately* ONLY IF you are interested in joining one of these groups AND ARE UNABLE to use the join button on the web site or find the join process confusing. I would like to avoid what happened when Yahoo closed their groups and I offered to help people if they were unable to join themselves. I was overwhelmed with requests to help, and I'm sure not all of those were from people who had difficulty joining, so please give it a try yourself first. Go to the site and press the join button on the group(s) you are interested in. Follow the simple instructions and you will be approved. All new members will be moderated for a short time so don't expect to post immediately. There's only one moderator right now (me), and I work for a living, sleep at night, and take naps because of my health condition in late afternoons sometimes. I donate some of my time for community work, am a minister, and have to wisely use my time. But I don't want anyone to not join one of these groups because they find it difficult to join. YOU CAN JOIN ANY OF THESE GROUPS BY EMAIL by sending a message to the subscribe address. Take the web address name at the end of the URL and change it by adding [email protected] to it. For the FT-757 group (as an example): /g/FT-757GX Send an email to this address: [email protected] no body text is required in the message, just the address, but to make your email program happy, you can put the word subscribe in the subject and message fields. These new lists are email reflectors only with no storage (a change that was made almost a year ago by GIO's owner). If I had created them before February 2020, they would have storage. We will work something out for storage if the groups get large enough and have a need for that. I will need moderators for these new groups, and soon after they get on their feet, a co-owner who has some real interest and hopefully experience with these different brands of radios. Contact me off-list if you are interested in volunteering with any of these groups. I will help you out with anything you need to know about how to manage a group as a moderator or co-owner. I will list the NEW groups first, then list the other amateur radio groups I created. Note that most of these are not model-specific and are "general-purpose" groups for a BRAND of radio or a general-purpose group for a type of equipment. I did not create any group for which there already was a general-purpose discussion group for that brand of radio, like Drake and some others. I am not interested in amassing a lot of groups to manage. My purpose is just to see that interes

The next message is about some new groups I created to have a general-purpose discussion group for some brands of amateur radio equipment and radios before groups.io's new pricing structure goes into effect Jan 81, 2021. It is a long message, so I just wanted to give you a heads-up. I cross-posted it to all the groups I manage. I will be looking for moderators for the new groups and even some of the established groups, so if you're interested in helping, please email me privately about this. For the rest, please read my next post. It's a long and detailed one. Donald -- AD8DY Formerly KJ3I ---------------------------------------------------- Some ham radio groups you may be interested in: /g/ICOM /g/Ham-Antennas /g/HamRadioHelp /g/Baofeng /g/CHIRP https://rf-amplifiers.groups.io/g/main