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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

This is all I know on the matter Rich, however I suppose it could have happned in a car. 73 Jim SM2EKM ------------------------------------------------------------- R L Measures wrote:

Guillermo, Is the resistors in mention connected across the base and collector of each transistor? If so, someone could have been trying to add feedback to the transistors. Generally though a

Jim, Grid dissipation is measured by ohms law, grid voltage by grid current. Since the grid is at ground, you just measure the catode voltage with a scope. For calculation of efficiency you have to

I'm searching for a solid state amplifier circuit, a Henry model C130A30 (for VHF FM). The one I have seems to have been modified, I see some resistors strangely connected both at base and collector;

Wrong again Rich. I'm the moderator for Topband and I didn't boot you off...so please fabricate another story about why you voluntarily left. I thought maybe it was because you realized you didn't

The straight up and down chimney will work pretty well if the flange is sub mounted below the chassis so air has a better path up through the anode. That's the plan here for the YC-156/179. 73, Tony

That is a good point for tubes like the YC-156/179. On tubes like the planar constructed GS-35B, the grid is tied directly to the ring and can move more heat. Unfortunately, the actual construction of

connection piece of bottleneck I would the size and have to ### The grid in both a 3000/6000/YC-243 is 225 W CCS... and resembles a bird cage. The joke is.. you can use it for a dummy load for your