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Re: Drake L-7
开云体育Hello, ? > Do you have the service manual of this amp? ** No, I don't have the service manual for this amp. If you could share it with me, it would be appreciated. ? > I remember the green capacitor (B) but not (A). ** Your capacitor 'A' went with your old RF choke. ? ? A= 47 pF B= 307 pF ? Thanks for the images of your modifications; they can be very useful to me -- F1AMM Fran?ois De la part de Evert Bakker |
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Re: Drake L-7
开云体育Hi Francois, ? I did not document my changes and sold the amp a few years ago. ? I remember the green capacitor (B) but not (A). That could easily be a memory leakage on my side but I couldn’t find it on the pictures before the restauration. . I don’t know the values of the (B) capacitor but replaced it with doorknob type (red). The red wire to the capacitor is spark-plug wire. On the attached picture you can see the new RF-choke was placed. When I looked at the photo’s I made, I saw I did change the indicator assembly as well. ? Do you have the service manual of this amp? ? 73, Evert ? / / ? From: [email protected] <[email protected]> On Behalf Of Fran?ois via groups.io
Sent: Sunday, 26 January 2025 06:08 To: [email protected] Subject: Re: [ham-amplifiers] Drake L-7 ? > The only thing I changed was the RF-choke and a replacement for the green pcb like 160m capacitor (by door knob types). > I only opened it once a year to remove the just. That was all. ? Hello ? I am weak in technology (I am 75 years old). It seems to me that you are pointing out the two curious plate capacitors A = C41 (47 pF) and B = C42 (307 pF). ? ? Could you give me, precisely, the replacement capacitors that should be supplied. A url would be welcome. ? -- F1AMM Fran?ois De la part de Evert Bakker |
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Re: Drake L-7
开云体育> The only thing I changed was the RF-choke and a replacement for the green pcb like 160m capacitor (by door knob types). > I only opened it once a year to remove the just. That was all. ? Hello ? I am weak in technology (I am 75 years old). It seems to me that you are pointing out the two curious plate capacitors A = C41 (47 pF) and B = C42 (307 pF). ? ? Could you give me, precisely, the replacement capacitors that should be supplied. A url would be welcome. ? -- F1AMM Fran?ois De la part de Evert Bakker |
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Re: Drake L-7
开云体育Why do you want to see these tubes all the time? ? It is the most reliable amp I’ve had. You can push this amp to all its limits and beyond, it just won’t die. Even when it starts to stink like burning socks. ? I used 2x 3-500ZG, for hours and hours, daily, for 15 years. ? The only thing I changed was the RF-choke and a replacement for the green pcb like 160m capacitor (by door knob types). I only opened it once a year to remove the just. That was all. Use it, push it, don’t worry about the colour of the tubes. Just stay within the current limits and you will be fine. (make sure the ventilation is running . ?) ? Great amp. ? 73, Evert ? / / ? From: [email protected] <[email protected]> On Behalf Of Fran?ois via groups.io
Sent: Saturday, 25 January 2025 17:30 To: [email protected] Subject: Re: [ham-amplifiers] Drake L-7 ? The top sheet metal is a solid sheet metal. You can see, very badly, through the fan. ? Removing the top panel: ok. To do a short test, it is a solution but in operation it is not reasonable, if only because it strongly modifies the path of the ventilation (airing). Without the cover, the air no longer comes from above by licking the filament seals and Eimac recommends. ? Maybe some have cut a small window blocked by a sieve and a plexiglass plate ? Eimac Technical data ? ? -- F1AMM Fran?ois |
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Re: Drake L-7
It seems your lid or top sheet metal has been changed. Mine has holes and I can see the tubes.
On Saturday, January 25, 2025 at 11:30:14 AM EST, Fran?ois via groups.io <18471@...> wrote:
The top sheet metal is a solid sheet metal. You can see, very badly, through the fan. ? Removing the top panel: ok. To do a short test, it is a solution but in operation it is not reasonable, if only because it strongly modifies the path of the ventilation (airing). Without the cover, the air no longer comes from above by licking the filament seals and Eimac recommends. ? Maybe some have cut a small window blocked by a sieve and a plexiglass plate ? Eimac Technical data ? ? -- F1AMM Fran?ois |
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Re: Drake L-7
开云体育The top sheet metal is a solid sheet metal. You can see, very badly, through the fan. ? Removing the top panel: ok. To do a short test, it is a solution but in operation it is not reasonable, if only because it strongly modifies the path of the ventilation (airing). Without the cover, the air no longer comes from above by licking the filament seals and Eimac recommends. ? Maybe some have cut a small window blocked by a sieve and a plexiglass plate ? Eimac Technical data ? ? -- F1AMM Fran?ois |
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?Southeastern VHF Society 2025 Conference Announcement & Call For Papers
#2MAmplifier
?
Southeastern VHF Society 2025 Conference?Announcement &?Call For Papers
Quality Inn, 3095 Wilma Rudolph Blvd, Clarksville, TN 37040 April 4th and 5th, 2025 Papers and presentations are solicited on both the technical and operational?aspects of VHF, UHF and Microwave weak signal amateur radio. Somesuggested areas of interest are: ? Transmitters, Receivers, Transverters ? RF Power Amplifiers, RF Low Noise Preamplifiers ? Antennas ? Construction Projects ? Test Equipment and Station Accessories ? Station Design and Construction ? Contesting, Roving, DX-peditions ? EME, Propagation (Sporadic E, Meteor Scatter, Troposphere Ducting, etc.) ? Digital Modes, Digital Signal Processing (DSP), Software Defined Radio ??(SDR) Amateur Satellites, Amateur Television In general papers and presentations on non-weak signal related topics such?as FM repeaters and?packet will not be accepted but exceptions may be made?if the topic is related to weak signal. For example, a paper or presentation on?the use of FM simplex in contests or on the use of APRS to track rovers?during contests would be considered.
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Formats:
All submissions for?publication in the proceedings should be in Microsoft Word (.doc or?.docx) formats. Submissions for presentation at the conference?should be in Microsoft PowerPoint (.ppt or .pptx) format and?delivered at the conference on a USB memory stick. Please?understand that your PowerPoint Slide presentation will not be?accepted to be published in the proceedings; only meaningful text?will be published in the proceedings, not slides that need?description for understanding.
Paper: Size should be?81?2 x 11-inches. Margins: Top and sides should be 0.75 inches; bottom must be 1?inch. Font: You may choose your font, however, try and use standard?fonts. The font should be clean and easy to read?12 pt. Layout: Either a one or two-column format. Page numbers: Do not include page numbers. Headers/Footers: Do not include Headers and/or Footers. Drawings: Drawings should be embedded in the files. Place them?where you’d like them to appear. Photos: Color or black-and-white digital images if utilized should be?embedded in text files. Place them where you’d like them to appear. Printing: We print what we receive. We do not copy edit (but will?correct something if we notice it – or if you notice it and let us know). We try to make all papers somewhat uniform, but we do not rework?each article. Page numbers are added as we prepare the files for our
printer.? The deadline for the submission of papers and presentations?is February 15, 2025.?
Please indicate when you submit your paper?or presentation if you plan to attend the conference and present?your paper in person or if you are submitting solely for publication.
Papers and presentations are being handled by Mike Stipick,?KC4RI,?and should be sent to:?KCRI@ATT.net. Mike may be contacted at the same email address if you have any questions. |
Robin Midgett