Hi Folks, I would like to build or buy a tuned input network (160M-10M) for an amp running a pair of 3CX800A7's. Here are my thoughts so far. Comments appreciated. Buy: So far, I haven't found anyone
Take a look at Paul's (WD7S) tuned input board: <http://home.earthlink.net/%7Ewd7s/TU-6B.htm> 73, Tony W4ZT _______________________________________________ Amps mailing list Amps@contesting.com http:
Bob: this option works for you ? http://home.earthlink.net/~wd7s/TU-6B.htm i found it several monts ago for the idea to add to the MLA2500 Hector Garcia XE2K / XF1K Mexicali B.C DM22 ________________
ORIGINAL MESSAGE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I considered that board but decided against it because nothing is adjustable except by soldering and unsoldering capacitors, or by
Bob The biggest issue you have to deal with is how much effort you want to put into the project versus the available economic resources. The LDG Circuit is a drop-in arrangement that will give you mi
Thank you Tony (and others) for the pointer to WD7S's web page. That's the kind of web site I was hoping to find! I'm interested in doing a power supply filter cap upgrade, soft start mod and grid pr
ORIGINAL MESSAGE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Why remove the tubes? Don't you want their capacity in there? Disconnect the heater power, yes, but leave the tubes in place I'd th
Bill and the group, I have not personally put one of Paul's tuned input boards on the air but my good friend Lawson, W4EMF, has first hand experience with it. His experience is that putting an Arco c
ORIGINAL MESSAGE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Boy are you thorough! Nice work. Changing the topic slightly, how much drive does a GS-35b need for 1500 watts output? It's probabl
Thanks :) Assuming a good tuned input match and the plate tank adjusted with a good Q, expect **about** 75 to 80 Watts drive for 1500 out. The 13 dB gain figure is quite close so a 100 Watt transceiv
ORIGINAL MESSAGE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ That was my concern, whether a 100 watt transceiver had any headroom. Thanks for the info. 73, Bill W6WRT _________________________
Bob I'm willing to guess that he will tell you the expertise of people working on amps varies widely and those at the bottom end of the spectrum are of marginal competence. If I sell a few hundred co
Drive power relates to output indirectly as anode voltage, biasing and operating frequency all influence output power. With 3000 volts on the plate OZ1DPR obtained the following 10 watts drive, 400 m
Hi Bob The reason I don't supply caps or wire for the kit is simple, money!! The number of mica caps I would have to keep in stock would run me into the thousands. Every time you move the board farth
ORIGINAL MESSAGE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I'm confused as to who is speaking here. Are you (W6AH) speaking for yourself or for WD7S? Whose kit has production been suspended
I agree totally with Bob about the dangers of running the GS-35B at voltages above 3800 Volts. Though it has been done, it is a very risky cloud to fly in and not where I would want to go. There are
This may be a stupid ? but if your radio has a Auto Tuner Could you not just use the one in the radio ? _______________________________________________ Amps mailing list Amps@contesting.com http://li
This idea keeps coming up. In my opinion, the *only* advantage of this solution (unless you are building a completely automatic amplifier a la 87A) is that it avoids the need to calculate input pi-ne
I would recommend that the input capacitor be fixed as it set the Q of the circuit. I'd put the trimmer on the output to compensate for variations in circuit layout and tube input capacitance. 73, Ro
Having a fixed input cap and fixed inductance you can not vary the center frequency of the circuit. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.co