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Ditto Jan, Couldn't agree more! And he takes nice, detailed pictures too! Merry Christmas & Happy New Year to you and to all!! Garry - WR4R Jan Erik Holm wrote:

I would really like to keep the exciter looking at 50 ohm so the amp could be switched in and out without retuning. David

Use ALC that would control exciter power. BOB DD Sent From Mobile Device

Rich, So what you are saying is that it really doesn't matter from the tube's input impedance stand point what value of resistor I use. I am running 3KV on the anode and 550V on the screen. According

D. -- The resistive component of the grid input Z is well over 1,000,000-ohms in AB1, and the reactive component is 78pF. With 750V on the screen, it takes c. –170 grid V to establish a ZSAC of

Does anyone have information as to the approximate input impedance of a 4CX1500A for the proper value of a passive grid resistor for this tube? I need about 100 ohm to get sufficient grid drive, i.e.,

Well, Santa brought me an $800 xmas present... I removed the HV lead from the 3CX1200D7 and cooked the filament at 7.26 volts for 6 minutes... Eimac had suggested 7.5 volts for 5 minutes but 7.26 was

Since I have forgot/lost my Yahoo password/ID and the lot for my ordinary email address I havent been able to sign in and view the pictures. Finaly I signed in with a new Yahoo ID and it was nice to

I know what I paid for my 3KU brand new... When I look at the quality of the materials, the hand made switching solenoids in the tank circuit, the silver plated 1/4" tubing roller inductor the size of

A broadband input plus g-g tells me that th

Well, today I measured the Penta 6JB6 heater current, which resulted 1.5A. or 25% more than data sheet stated (1.2A). The rig is working with two Pentas (120 watts out), and I added some resistance to

wrote: long impedence Pi- ### where have u been ? yes... it's GG. Now u know why I collect amplifier manuals.

Bill it all has a lot to do with CONDUCTIVITY and stability. Whether it is electrical or thermal conduction. Copper has a large availability of free electrons. The molecules freely exchange them.

<rbonner@...> wrote: KWM-380 F'enheimer are ### The TR-7 wsn't too bad. The KWM-380 was pure junk imo. The mating outboard processor for the 380 never did work right. Funny thing though... in the QST

Hey Gary, Heading out the door on the way to grad school. The TR-7 showed up on the doorstep, right about the same time the KWM-380 showed up on the doorstep we tested both and said, what the

ORIGINAL MESSAGE: <snip> ------------ REPLY FOLLOWS ------------ When I went to work in the avionics industry, one of the hardest things I had to relearn was "ground", but I think the way the avionics

Sorry Hal, but your reply was totally incomprehensible. You went off about fractals, space blankets, waterbeds and electric bills without answering my question regarding density of "stuff",

Hi Bob, Were you with Drake when the L-7 came out? Thanks, Garry - WR4R Robert B. Bonner wrote:

Yes, the 3K Ultra uses a transmission line transformer to convert the ~70 impedence at the cathode to 50 ohms... No tuned circuitry... It has worked for ~8 years without problems, though the input swr

I was a Drake technician, put myself through college doing it. (Actually Collins, Hallicrafters FPM-300 was their last hurrah, Kenwood, Drake, Icom I hated Icoms in the 70's they were like transistor