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YC-156 amp
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Jim,
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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 a decent price, would be a quick swap. However it will be GG. The 4-1000A is a pain in the rear end and Im getting to old to struggle with them. 73 Jim SM2EKM ----------------- pentalab wrote: ### These YC-156's [and YC-172's] are a huge bang for the buck. 200 w drive = 10kw + out. No socket required. $400.00 ### after messing about with multiple tube linears in the Later.... Jim VE7RF |
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Mike\(W5UC\) & Kathy\(K5MWH\)
¿ªÔÆÌåÓýJim, 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.? With 75 watts from the HT-37 I could drive the 3-1000Z WAY beyond legal limit on 80 meters, and it performed well up through 10 meters.? It was stable and a very nice amp.? I still wish I had not sold it. ? 73, Mike, W5UC
The 4-1000A is a pain in the rear end and I?m getting
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FRANCIS CARCIA
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.
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"Mike(W5UC) & Kathy(K5MWH)" wrote:
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Tony King - W4ZT
I have several friends running the YC-156/179 GG, cathode driven with
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tuned input. With anode voltages of 5500 to 6500 they observe power gains upwards of 19 dB. As you reduce the plate voltage drive requirements go up but at the higher voltage, you can be VERY happy with less than 100 Watts drive. The YC-156/179 is far better than the 4-1000 both in performance and cleanliness of signal (on air comparisons). Of course you can't watch the anode blush but the big gratification comes from other things ;) 73, Tony W4ZT Jan Erik Holm wrote: Jim, |
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Well they are difficult to get stable. They run just
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fine now but Ive used 4-1000s for 35 years and frankly Im a bit bored with them. 73 Jim SM2EKM ---------------- GGLL wrote: Jan Erik Holm escribi:Jim,The 4-1000A is a pain in the rear end and Im getting to oldWhy?. |
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Thanks Tony,
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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 have to run them in series, input Z is close to what 2x4-1000A has and it just needs a tweak, I already feed the 4-1000s with a big 3-phase power supply, means I can run the YC-156 at a nice level. 73 Jim SM2EKM ---------------- Tony King - W4ZT 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 requirements go up but at the higher voltage, you can be VERY happy with less than 100 Watts drive. |
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Yes understand. Well 4-1000As can be made to run very
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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 ----------- FRANCIS CARCIA wrote: 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. |
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FRANCIS CARCIA
That was my reason for moving to 4CX3000A and bought 6 for $100.
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Jan Erik Holm wrote:
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pentalab
--- In ham_amplifiers@..., Jan Erik Holm <sm2ekm@...>
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 80's. ### The YC-156 in GG has a huge amount of gain. 100 w and low plate v... like 4 kv will do 4 kw out. My buddy had a 4- 1000 amp... he converted to a pair of 8877's.... then later on... replaced the 2 x 8877's with a single YC-156.... best thing he ever did. ### They all used a removeable aluminum plate for the tube... so the plate could be removed... and replaced with another plate / diff tube/socket combo. Of course all the LC ratio's on the pi-net had to be changed. ### I'm told the YC-156 has an input Z of 25 ohms.... so base any tuned inputs around that... and use paralled RG-58 u coax to make the 25 ohm cable from output of tuned input... to socket. ### also beware.... the YC-156 has 36 pf of anode to grid C........ which will INCREASE to 50 pf.... when the YC-156 is bolted to the chassis !!! ### The 3000A7 does the same thing.... anode to grid C is 24 pf.... and rises to 33 pf when plugged into the grid ring. ### The 6000A7 is 24.5 pf anode to grid.... and rises to 36 pf when plugged in. ### To get these big tubes to work on 20-10m.... you gotta add .6 uh between plate block cap and tube.... OR just tap into the 1st .6 uh of main tank coil.... with the vac tune cap.... amounts to the same thing. ### This will DROP ther plate load Z WAY down.... so the PI net is designed around this lower value. ### I use GM3SEK's excellent pi pi-L spreadsheet. It factor's in this L between tube anode and the pi net. Any stray L between the anode and the input of the PI net will make a HUGE difference in transformed plate load Z on the higher bands. [I also use his spread sheet for the pi tuned input calcs] ### also if u have any kind of Z bump bewteen vac load cap and the vac T/R relay...... you will have a mini PI-L on the high bands.. esp 10m..... which will put the vac load cap at a sky high Voltage. 11m ops have used just wire, strap between vac load cap.. and the vac T/R relay.... and smoked 5 kv rated vac load caps !! ### I deep sixed 10/12 m from the last bunch of linears I have built. Also, if you do, beware of trying to re-use the 10m tank coil tap... on 12M. The Q will sky rocket... and the circulating currents will cook everything. Later.... Jim VE7RF the $400.00buck. 200 w drive = 10kw + out. No socket required. the
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