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Author Topic: New Acom Amps 1200 and 2100  (Read 56094 times)
K7JQ
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Posts: 1319




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« Reply #15 on: September 07, 2015, 02:46:26 PM »

A European website (converted to US$), gbantennes.com, has the 2100 priced about $900 more than the 1500. Don't know if this will be the case when the 2100 hits the States, but if it's a price point difference close to that, the 1500 should be a viable option, and remain in the lineup. Also, I was told by an Acom executive that the 1500 will continue to be manufactured as long as there is demand and orders for it.
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SA4MDN
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« Reply #16 on: December 27, 2015, 03:47:49 AM »

Acom 1200s not going to be available at the earliest end of march 2016, so I been told by Val at Acom, gave up waiting for it now, have an spe expert ik-fa coming tomorrow, it was due to be released at the end of December, then end of January, now the latest is the end of March, so who knows when its going to be in the shops. first announced at the end of June I believe.  
« Last Edit: December 27, 2015, 02:08:31 PM by SA4MDN » Logged
W1WN
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Posts: 17




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« Reply #17 on: March 17, 2017, 05:09:26 AM »

DX Engineering will be debuting the Acom 1200S at Dayton.  List price expected to be $3,500 or less.

Dave, w1wn
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AB4D
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« Reply #18 on: March 17, 2017, 10:00:34 AM »

DX Engineering will be debuting the Acom 1200S at Dayton.  List price expected to be $3,500 or less.

Dave, w1wn

Great news.  I own a 600S, and it's a fantastic amplifier. It's the only amplifier, that I have ever heard that is quieter than a Drake L-4B.  I suspect, the 1200S will be just a good. 

Jim AB4D
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W9GB
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« Reply #19 on: March 18, 2017, 06:30:23 PM »

Here is the Acom 1200S HF Amplifier (solid-state) 2-page leaflet
http://acom.radioamater.cz/acom1200s-leaflet.pdf

Weight: 26.5 lbs.
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K0CWO
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Posts: 550




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« Reply #20 on: March 19, 2017, 07:31:50 AM »

I also own a 600S. Great amplifier so far!  Paid $2600 for it new on sale.  Perhaps a bit steep but definitely worth it once you see what you get.  I would have gotten the 1200S had it been available.  As far as I can tell the 1200 is twice the power and nearly the same size and weight.  I'm planning on getting one to retire my AL-80A.  I think these type of amps will rule the roost in the not so different future.  They are a breeze to use.
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K6JH
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« Reply #21 on: March 20, 2017, 04:30:29 PM »

At $3500 for this, why would anyone buy an Ameritron ALS-1300 or ALS-1306?
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73
Jim K6JH
W9GB
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« Reply #22 on: March 20, 2017, 06:10:47 PM »

Quote from: K6JH
At $3500 for this, why would anyone buy an Ameritron ALS-1300 or ALS-1306?
Jim -

The Acom 1200S retail price, without VAT, is € 3,052.30
http://www.acomcz.cz/zesilovace/acom-1200s-[id=AC1200S].html

The "WildCard" is € to $ conversion rates and Trump's potential Trade Tax (Barrier).
Since the UK Brexit vote, the US Dollar has strengthen against Euro and British Pound.
Currency conversion rate, this evening, was € 1 to $ 1.0754

Here is the ballpark conversion ... of course Shipping is another cost.
€ 3,000 = $ 3,226
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K0CWO
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« Reply #23 on: March 20, 2017, 08:15:19 PM »

I had an Ameritron ALS-1300, despite growing pains it was a pretty good amplifier.  The 1306 has a better track record but I would prefer the Acoms over either the ALS-600/1300/1306 any day.  The unwieldy Cinch Jones cabling from power supply to RF deck are archaic in my opinion and the depth of the 1300/1306 RF deck don't mix well with cramped quarters either. 

Build quality wise the Acom product is far more appealing and having an amplifier at almost the same size of an Ameritron ATR-30 antenna tuner makes for a small footprint and relatively light weight package.  The Acom 600S interface is very nice, RF sensed "semi" automatic band switching, quiet, and puts out 600 watts continuous duty.

Time will tell how reliable these Acom SS amps will be.  The Ameritron amps are probably easier to repair at the user level with support available from Mississippi.

Price wise these SS Acoms are attractive to me.  You certainly get wat you pay for and I hope they compare to their tube amps as far as reliability goes.
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W1WN
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« Reply #24 on: March 21, 2017, 02:01:23 AM »

I have had several Acom amplifiers.  The 2000A, 1000 and 600S.  In fact more than one of each model.  Sold only because circumstances changed or wanted to try something else.  I have never had a problem with any of them.  Sold the 600S because there wasn't for me much need for a 600 watt amplifier since I operate a 200 watt radio, so have been waiting for the 1200.  I will say that customer support is incredible.  If I send an email to Val in Bulgaria it is answered the same day (given the time difference) and he even answered emails sent when the factory (and most Europeans) take a 1 month summer holiday.  Looking forward to it and I have my name on the list for one!

Dave, w1wn
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ZS5WC
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« Reply #25 on: March 21, 2017, 02:42:18 AM »

 Grin Another new one to consider:

https://n6pse.wordpress.com/2017/03/14/new-solid-state-amp-from-expert-spe/

The EXPERT 1.5K-fa.
Good quality, can interface with any rig, nice new PA device, very LOW imd figures.
There is another thread in the Amplifiers forum.

73 de William
ZS4L / ZS5WC
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K6AER
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« Reply #26 on: March 22, 2017, 11:22:13 AM »

Hello,
Do you fine gentlemen/YLs know if these amps are going to be available for the US?

http://www.acomcz.cz/zesilovace/acom-1200s-[id=AC1200S].html

Thanks in advance for any information,
de W1LEA ex.KN1W
\
ACOM makes very nice amplifiers and you will not go wrong with each model.

The ACOM 1200 and 2100 are two very different animals.

The 1200 is a solid-state amplifier that puts out 1200 watts at a class AB linear output level using push pull devices. I would guess the IMD to be around 30 dB, 2nd to 3rd at rated output.  Any more power out and your IMD will go to hell in a hand basket.

The ACOM 2100 is a tube amplifier and looks to be an upgrade of the ACOM 1500 which uses the 4CX1000A tube in class AB1. IMD on the 1500 amplifier is rated about 35 dB, The ACOM 2100 looks to be a beefier version using the same tube with some hardware rearranged on the chassis. This is probably in response to the OM-2000+ which has been a market winner with its 2200 watts out on 160-10 meters and 1700 watts out on 6 meters. I have not been able to find out what the rated power is on the 2100 but anything much over 1500 watts is pushing the 4CX1000A tube very hard. I saw a video with 2000 watts PEP SSB showing on the amplifier but who knows if it can run that level for any time. I would be much more interested if the amplifier had a 4CX1500B or the FU728F tetrode.

So basically, you have instant (1200) on or more power (2100) after a three minute warm up, all pricing aside. I am sure both amplifiers will be available as soon as the FCC certification is made available.
« Last Edit: March 22, 2017, 11:34:08 AM by K6AER » Logged
W6MTF
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Posts: 34




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« Reply #27 on: March 22, 2017, 04:25:32 PM »

K6AER said:  I have not been able to find out what the rated power is on the 2100 but anything much over 1500 watts is pushing the 4CX1000A tube very hard. I saw a video with 2000 watts PEP SSB showing on the amplifier but who knows if it can run that level for any time. I would be much more interested if the amplifier had a 4CX1500B or the FU728F tetrode.
to respond to the tube portion of the discussion let me give some advise (being more experienced with tubes than SS), but first a question to AER:
Is that 1500W PEP or CW? The Eimac 4CX1000A is really not intended to deliver more than around 1200W PEP (or CW). It was designed when the max allowable limit was 1000W. With the "normal" voltages applied anything over 1200W to 1250W IMD goes up and I mean A LOT! and the grid is close to being destroyed! Keep in mind the 4CX1000A has a maximum grid current rating of 1 milliamp. Without ALC it is easy with today's modern exciters to overdrive either of the tetrodes we are speaking of. How many hams have ALC connected? Not many, based on my experience.
 
Its been discussed a number of places before and I won't delve into it now but either the 4CX1500B or the FU728F alternatives are worth considering as a upgrade for better IMD and with a side benefit of a few hundred watts more output.  Most Hams being WATT CRAZY will yearn for 250W more over 1250W,  believing it is worth all the effort to get 1500W out -  replacing transformers, jacking up screen voltage etc - for WHAT? it doesn't give a fraction of an S-unit (if the S meter is even calibrated) at the receiving end. Its just HAM LOGIC = EGO!
The best thing the improved tubes (es the 4CX1500B I can't speak with authority on the FY728) is a more effective anode cooler (added fin area).
I suggest one check the manufacturer's data sheets for whichever tube you are using and compare to the design voltages in the given amplifier before attempting a tube change.  And always remember a wattmeter doesn't show IMD! 
GL  de Reid W6MTF
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K6AER
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« Reply #28 on: March 23, 2017, 07:27:56 AM »

The Eimac 4CX1000A (8168) was designed as a military tube and had nothing to do with Ham Radio FCC regulations. The tube has a rotating flange connections (special breechlock) for the element connections and is rated for 20G’s of force in all directions. The Eimac rating for the tube is 1.63 KW in class AB1 with a plate voltage of 3000 volts. With higher air pressure the tube should be fine at 1500 watts out CW.

The 4CX1500B (8660) has the same anode voltage rating and extra fins within the anode heat sink but for all intent and purposes the tubes are interchangeable. When running the 4CX1500B at rated output the air pressure needs to be about 2.5 times what the 4CX1000A needs for rated output. Most amplifier designs run the 4CX1500B at about 3300 volts on the anode. This also helps the IMD ratings due to higher anode voltage. Eimac’s rating on the tube in Class AB1 is 2.7 KW input.  Typical output power (listed by Eimac) is 1100 watts Class AB1.  This is where the IMD testing was done.

Still a better tube would be the Chinese FU728F. The anode is taller and the tube is rated at about 1800 watts out single tone in Class AB1. Two Tone output is rated at 2500 watts. The higher ratings are due mostly to the increase cooling capability. Other than the larger anode the tube is the same as the 4CX1500B and in the amplifier design, the tubes are interchangeable depending on socket design and the change of filament voltage to 9 Volts. On my OM2000+ I have measured the IMD at 42 dB, 2nd to 3rd, on 20 meters. Price on the tube is about $400.
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N8CBX
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Posts: 565




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« Reply #29 on: March 23, 2017, 08:34:09 AM »

...Most amplifier designs run the 4CX1500B at about 3300 volts on the anode...Typical output power (listed by Eimac) is 1100 watts Class AB1.
I don't see numbers like that in Eimac's 4CX1500 spec sheet:
3000 volts is MAX plate voltage
AB1 typical example:
Plate = 2900VDC
Screen = 325VDC
Plate current, idle=250mA/max=(about 800mA)
Load setting = -10mA to -16mA of screen current (notice the "-", operating in the negative screen current region)
Useful power = 1384Watts

Jan N8CBX
« Last Edit: March 23, 2017, 08:36:40 AM by N8CBX » Logged

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