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Author Topic: Looking for Linear Amplifier  (Read 31141 times)
N8FVJ
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Posts: 910




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« on: July 23, 2017, 05:55:49 AM »

I am wanting a desk top amplifier that uses a 4CX1000 or 4CX1500. An amp using this tube takes less than 100 watts to drive for full output. I heard a pair of 3-500Z takes upwards of 150 watts for full output. I want less than 100 watts drive for full output. I like that 4CX1000 or 4CX1500 tube as NOS or new manufacture are always available at a cost of $500-$800.

I heard those $495 3CX800s are long gone and a single tube from Penta is now $900.
« Last Edit: July 23, 2017, 06:11:21 AM by N8FVJ » Logged
W1NK
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« Reply #1 on: July 23, 2017, 06:26:17 AM »

The Acom 1500 sounds like it might meet your needs.  It uses a 4CX1000A and requires 85W of drive.

DxEngineering has them for just under $4000.

Frank, W1NK
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K7JQ
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« Reply #2 on: July 23, 2017, 06:46:08 AM »

The Acom 1500 sounds like it might meet your needs.  It uses a 4CX1000A and requires 85W of drive.

DxEngineering has them for just under $4000.

Frank, W1NK

85W drive is too high. Depending on the band, 65 to max 75W is all that's needed. If you don't abuse the tube, you won't have to worry about buying a new one. Sometimes HRO runs a sale on the Acom 1500 at $3,500. Acom is also coming out with a 2100 model. Same tube, bigger power supply....will run legal limit continuous, all modes. Not much headroom, though, as the tube's limit is pretty much maxed out. Want more headroom? Alpha 8410 runs a pair of 4CX1500's. Earlier models used 4CX1000's.
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KC4ZGP
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« Reply #3 on: July 23, 2017, 07:23:50 AM »


Looking for a lin-yeer? See your local CBer. Having fun bud.

I too am looking for a good amplifier but all I see is bad, bad, bad with any model.
It's just a matter of figuring out which gets the least 'bad' votes.

On 18.136MHz phone right noow, 1424UTC, 7/23.

Kraus

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N8FVJ
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« Reply #4 on: July 23, 2017, 07:33:48 AM »

I noticed an Acom 1200S solid-state amplifier. Never thought about SS. It uses 2000va for full 1200 watt output. I can use a 120 volt @ 20 amp line on this amp. Cannot find one in USA though. MFJ has 1200 watt amps, but needs a lot more AC mains power. Anyways, I could go with SS too.
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K6AER
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« Reply #5 on: July 23, 2017, 07:58:05 AM »

I am guessing by full output you are wanting 1500 watts. The OM Power OM-2000+ requires 29 watts in for 1500 watts out on 10-160 meters. It uses the Chinese FU728F tetrode which cost about $350 for a spare. The amplifier cost about $3500 and covers 6 meters. Servicing is handled through Array Soultions.

The problem with a 2000 VA supply is a normal 120 volt house socket is 1800 VA (15A) and some of that output is shared with other rooms and lights. Unless you are running the amplifier at reduced output you should have a dedicated line for the amplifier.

What is your budget? Is the station set up for higher power out? Also consider coax switches, tuners , coax, antennas and possible RFI interference to the home an neighbors.

As a general rule you get more bang for the buck with a tube amplifier. Great bargains are out there on the used market. Unless you need that last 3 dB of transmitter signal maybe a solid state amplifier might fit your needs.
« Last Edit: July 23, 2017, 08:19:16 AM by K6AER » Logged
K7JQ
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« Reply #6 on: July 23, 2017, 08:09:35 AM »

I am guessing by full output you are wanting 1500 watts. The OM Power OM-2000+ requires 29 watts in for 1500 watts out on 10-160 meters. It uses the Chinese FU728F tetrode which cost about $350 for a spare. The amplifier cost about $3500 and covers 6 meters. Servicing is handled through Array Soultions.

What is your budget?

Also an excellent choice, but you mentioned only having 120V mains. A no-no if you want to run a KW+ on any amp.
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N8FVJ
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« Reply #7 on: July 23, 2017, 08:32:48 AM »

Can spend up to $4K. I have 2400 watts (20 amps x 120 volts) in my shack and only 30 feet from mains box for low voltage drop.

1200 watt PEP is enough, just want under 100 watts drive for that 1200 PEP out.

SS is an option for me, just did not think about that. Ameritron SS is inefficient needing over 2400 watts in for 1200 out. I can install a 30 amp 240 volt AC line in ham shack, but would rather not have to.
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KH6AQ
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« Reply #8 on: July 23, 2017, 09:07:26 AM »

The Acom 1200S is rated 1000 W PEP, +/-0.5 dB. That is 900 to 1100 watts. The relatively high efficiency for a SS amp is achieved by it having a built-in antenna tuner and so the PA is always running at its sweet spot.

http://www.wimo.com/amplifier-acom_e.html
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N8CBX
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« Reply #9 on: July 23, 2017, 09:08:55 AM »

"...just want under 100 watts drive for that 1200 PEP out..."
Suggest a Heathkit SB-220
Jan N8CBX
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Dayton Ohio - The Birthplace of Aviation
KC4ZGP
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Posts: 1961




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« Reply #10 on: July 23, 2017, 09:11:27 AM »


Build an amplifier.

EB-104 for 600 watts. Combine two for 1200watts, four for 2400 watts.

All up to you.

Kraus
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K2FW
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Posts: 218




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« Reply #11 on: July 23, 2017, 09:14:39 AM »

I agree with K6AER.

Look at OM Power.  Their smaller Amp will be more then enough for you & is in your price range. 
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N8FVJ
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« Reply #12 on: July 23, 2017, 09:22:20 AM »

1000 watt pep is minimum but acceptable to me (not wanting to sound like a snob here).
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K2FW
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« Reply #13 on: July 23, 2017, 03:12:27 PM »

1000 watt pep is minimum but acceptable to me (not wanting to sound like a snob here).
The OM Power Amp model 2000+ does legal limit plus without hardly straining & also fits your price range.
I own the HF-2500 model & love it.

Steve  K2FW
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N8FVJ
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« Reply #14 on: July 24, 2017, 04:23:26 AM »

Never thought about power requirements. I can operate the Acom 1200S on my existing 120 volt line plus other station items. I am ordering the Acom 1200S as soon as the FCC approves. Looks like late summer to early fall of this year. Thanks all.
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