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Great info Jim! NOW we're talking amplifiers ;-) Thuis yahoo group has the possibility of posting pictures, files and the like. Some pics of your "QRP" amps (They also make the usual 10 kw 5 kw.. 2.5

wrote: full ### Peter, et all ### I had an engineer buddy of mine cook up a high reflected power shut down circuit for me. My buddy got a hold of a ton of Bird single line sections. He joined two of

Gents This may well be old news to some... but Coaxial Dynamics makes a 25 kw slug.[2-30 mhz].. for a standard 7/8" line section....cheap. They also make the usual 10 kw 5 kw.. 2.5 kw qrp slugs. It's

wrote: use a full ### Partially agreed. ..BUT the 3CX-6000A7 is rated at 3.5 A of plate current CCS. [7 kv under load] . ## as is.... with 2.5 A of plate current @ aprx 6900 V under load.... DC input

That's pretty much what Care and Feeding ... ... says. Avg. DC grid- current is measured with an ordinary panel meter.

wrote: with ### whoa. Are you saying RF cathode V x DC grid current = grid diss ???? ### That equates to way below 200 w of grid diss.... based on 45 ohm input Z... and 800w of drive . I can see we

wrote: ### 9-12 kw out with 200w of drive. ..easy. [7900 v no load] #### The trbl with 4-1000's is trying to find good one's these days. I had single 4-1000's and pairs of em... between 1976- late

That was my reason for moving to 4CX3000A and bought 6 for $100. Jan Erik Holm <sm2ekm@...> wrote: Well they are difficult to get stable. They run just fine now but Ive used 4-1000s for 35 years

Yes understand. Well 4-1000As can be made to run very good, however I just want to try something else. However those tubes they glow very nice in the dark, both filament and plates. 73 SM2EKM

Thanks Tony, OK 19 dB or so, sounds nice. Yes its a nice tube, time to retire the old 4-1000A bottles. As I said it will be a simple swap. I already have two 7.5 V fil transformers in the box, just

Well they are difficult to get stable. They run just fine now but Ive used 4-1000s for 35 years and frankly Im a bit bored with them. 73 Jim SM2EKM ---------------- GGLL wrote:

I have several friends running the YC-156/179 GG, cathode driven with tuned input. With anode voltages of 5500 to 6500 they observe power gains upwards of 19 dB. As you reduce the plate voltage drive

My Buddy still has my 4-1000A with a pair of BC610 plate transformers. It is stable 160 through 10. makes 1500 watts. makes a lot more with 5500 on the plate. "Mike(W5UC) & Kathy(K5MWH)"

Jan Erik Holm escribi: Why?. Best regards Guillermo - LU8EYW.

No, they're not for feedback; these resistors are from base to ground and even from base to base, there are three, and are different types than those used in the attenuator for example, look modern;

Were you always the Moderator of Topband? The RF conductivity or the DC conductivity?

Thanks, Jim. RIP, Bill Fisher.

Jim, more years ago than I can remember I built a 4-1000A GG amp. It was ok, but hard to drive. At that time I had a HT-37. I came upon a 3-1000Z, which can be plugged right into that same socket.

I agree with Will. Why rebuild, I would just fix whats broken and continue to use it. 73 Jim SM2EKM -------------------- tm303 wrote:

Jim, Grid drive I suppose? In GG I would guess with 200W drive maybe 5-6 kW, or? Im planing to replace my 2x4-1000As with a YC-156, I think its a ideal tube. As soon as I can get hold of a good one at