开云体育
Hey Chuck.? Have not had a QSO is a long time. Where are you hanging out these days on AM?
W7WRX
From: [email protected] <[email protected]> on behalf of Chuck Neal via groups.io <cdoneal@...>
Sent: Tuesday, February 4, 2025 9:38 AM To: [email protected] <[email protected]> Subject: Re: [ham-amplifiers] Dilemma ?
Grid drive one 4-400 with bias and screen voltage.? Then you can run Class C for plate modulation and bias it for AB1 or AB2 operation for SSB amplifier mode. ? A Johnson ranger or similar power level ?“boatanchor” would make an ideal driver for the Class C operation.? Lots of schematics available in earlier ARRL publications for such a set up. I think there was a 4-400A amp in several of the ARRL handbooks from the 1960’s. ? 813’s get squirrely on 15M and above and can be tamed but efficiency drops a bit. ? What are the modulator tubes and which modulation transformer are you going to use? ? I’ve built several AM rigs in the past ten years and have pictures of them on my QRZ.com page.? Check out the 4-400A rig I designed and built.? Also the 813 rig. ? -Chuck K1KW ? From: [email protected] [mailto:[email protected]]
On Behalf Of kc1at via groups.io ? Over the years I've collected parts to build an amplifier. Life got in the way during most those years but now I find myself with the time and ambition to build an amplifier for my boatanchors. ? As far as bottles are concerned I have a bunch of 813s a 3-400Z,. couple of 4-400s and of course the usual 811s, 807s, 6146s........Got plenty of iron for a power supply up to 3kv. ? Need some direction as to which way to go.? I operate 40 thru 10. Have a soft spot for AM. (yes I'm old) but do CW and SSB. ? Finishing up a 350 watt modulator. ? OR should I forget all this stuff sell it and buy an amplifier. ? don |
