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Author Topic: Acom 1010 Vs Acom 1011  (Read 5231 times)
CR7AGJ
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Posts: 6




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« on: November 08, 2012, 02:36:58 PM »

Greetings

I know there is lot of question about these 2 amplifiers...

Since the two amplifiers each have their valve, the Acom 1010 4CX800A (GU74B) and Acom 1011 with 4CX250B (7203), in terms of power which is the best?
Already read a few articles and specs that say the 1010 Acom has dissipated power of 800w and 500w Acom 1011, what does this mean?

I'm in doubt between one of the two, so there is a lot of information on the Internet and does not seem to be the right one, some say the two have exactly the same power output, others say the 1010 Acom has more power.

Also already told me to buy Acom 1011, as it is cheaper and newer and is very identical to Acom 1010.

Want to have your opinion and help me decide what to buy

thank you very much

73

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W9GB
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Posts: 2626




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« Reply #1 on: November 08, 2012, 07:45:44 PM »

The Array Systems (Acom USA) is a bit clearer in descriptions.
http://www.arraysolutions.com/Products/acom.htm

Both amplifiers use ceramic tetrode RF tubes.

Acom 1010 - 800w output - 160 thru 10m (4CX800 final)

Acom 1011 - 700w output - 160 thru 10m (Two 4CX250B finals)
===
For my selections:  I look at the availability, popularity, and price of the RF tube that amplifier is designed around.  Just like the engine (power plant) for an automobile.
« Last Edit: November 08, 2012, 07:56:27 PM by W9GB » Logged
VR2AX
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Posts: 589




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« Reply #2 on: November 08, 2012, 09:31:37 PM »

You can also view (slightly different) specs here:

http://www.vinecom.co.uk/

(Click the left link "HF Amplifier")

The 1010 is a 'light' version of the ACOM 1000, mainly built around a smaller/lighter duty cycle HV transformer. The 1011 is a new design (possibly drawing from the 1010), using a pair of 4CX250B in place of a single GU74b (4CX800A).

The weight of the 1011 is close to 40lb, however, whereas the weight of the 1010 is closer to 33lb.

Concern over a possible supply problem with the military surplus GU74b (Svetlana having apparently discontinued production of new 4CX800A's), may have been a factor, technical or marketing, in the decision to produce the 1011. I also heard rumors of some problems/factory returns, involving early 1011's (which may have been sorted).

They both look more like 500 watt continuous/700 watt pep output amps to me. The 1000, and especially the new 1500 (using a single 4CX1000, producing 1.8KW out on 6 meters), look more attractive investment.
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CR7AGJ
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Posts: 6




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« Reply #3 on: November 08, 2012, 11:40:36 PM »

The difference of the two valves in practical terms is that much?

In the SSB modulation Acom 1010 has much more power than the Acom 1011 or are very similar?

Thanks for the answers

translation done on google translator
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VR2AX
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Posts: 589




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« Reply #4 on: November 09, 2012, 04:14:36 AM »

Quote
The difference of the two valves in practical terms is that much?

I have better confidence in the GU74b/4CX800A.

It is my personal opinion.

Other hams may have different but valuable opinions.

Good luck.
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W9GB
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Posts: 2626




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« Reply #5 on: November 09, 2012, 06:49:25 AM »

Rumors and Price gouging have created confusion about the GU74b/4CX800A.

Array Solutions (Acom USA) recently posted this clarification, to address RUMORS.
http://www.arraysolutions.com/Products/acom.htm

Fact: The rumor of tubes not being available for these amplifiers is FALSE.

We have these tubes IN STOCK.
We have a good and continuing supply of "new old stock" (NOS) matched pairs, at very reasonable prices.
Currently a matched set of GU74B (4cx800) is $600 for the pair.

Array Solutions (Acom USA) understands the GU74B (4CX800) supply situation as follows:

1. Svetlana still makes these tubes - but not on a regular basis.
2. New tubes are very expensive - > $1k per tube.
3. The date code on these tubes makes no difference.
4. If it is "new old stock" it's still new.
5. If you think about it, any tube becomes "new old stock".
6. Every tube supplied in an Acom amplifier is fully tested.
7. Every tube sold in an amplifier has a full new tube warranty - regardless of date code.
8. To get a decent per-tube price, Acom purchased a warehouse full of these tubes.
9. The Russian military still uses these tubes in their communication equipment.
 
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CR7AGJ
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Posts: 6




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« Reply #6 on: November 09, 2012, 10:41:33 AM »

I do apreciate if you answer directly to my question and doubt

Thanks
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WX7G
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Posts: 6136




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« Reply #7 on: November 09, 2012, 01:10:11 PM »

Is the 4CX250B tube still made and if so by what company?
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W6UV
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Posts: 538




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« Reply #8 on: November 09, 2012, 01:25:24 PM »

Is the 4CX250B tube still made and if so by what company?

They're still listed in the CPI/Eimac catalog.
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K6AER
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Posts: 3525




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« Reply #9 on: November 09, 2012, 03:28:31 PM »

The 4CX250B is used in aviation VOR transmitters and must be replaced avery 90 days. There are over 4000 VOR transmitters in the US alone. The FAA puls them out and sell then for their weight as scrap metal.

As pulls these tubes are dirt cheap. They have low anode capacatance, heat quickly and work well above 400 MHz. I am surprized thay are not used more in amplifiers. A quad of them can put out 1500 watts in SSB operation easily.
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CR7AGJ
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Posts: 6




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« Reply #10 on: November 10, 2012, 01:39:06 AM »

so which amplifier is better Acom 1010 or Acom 1011?
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KA5N
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Posts: 4380




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« Reply #11 on: November 10, 2012, 03:25:07 AM »

Since you don't seem to be sure just what you want in an amplifier. 
I think that no matter which amplifier you buy you will soon wish you
had bought the other!  Either one will probably do an adequate job.
Were it possible to try each one for a month or so, you would see
which you like.  But!  Don't depend on other people to decide for you.

Good Luck
Allen   KA5N
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CR7AGJ
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Posts: 6




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« Reply #12 on: November 10, 2012, 03:29:03 AM »

Obviously I know what I want, a power not less than 700w and something reliable.
When I ask the opinion of someone, will not be for me to decide but decide to help me, since I am not very technical, use things in practice and is for use Dx

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W8JX
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Posts: 6080




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« Reply #13 on: November 10, 2012, 07:33:38 AM »

Obviously I know what I want, a power not less than 700w and something reliable.
When I ask the opinion of someone, will not be for me to decide but decide to help me, since I am not very technical, use things in practice and is for use Dx



The difference between 700 and 900 watts is less than a db. Myself I would so with the 4cx250's. It is a tube still widely available and of good quality.
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K1ZJH
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Posts: 1087




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« Reply #14 on: November 10, 2012, 12:35:51 PM »

You should be able to put together a life time supply of spare 4CX250 tubes if you go with the amp that uses them. They are still cheap and widely available.

Pete
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