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| Reviews Summary for Dressler D200S |
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Reviews: 2
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Average rating: 5.0/5
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MSRP: $(missing—add MSRP)
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Description: Compact (akin to desk top PC) 4CX350A 144MHz amplifier.
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More info: http://
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You can
write your own review of the Dressler D200S.
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W4MAC
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Rating: 5/5
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May 29, 2007 21:44
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Well, It's all that.
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Time owned: more than 12 months
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I bought this amp about a year 1 1/2 ago, without knowing anything at all, exept what the previous poster here had said. It was on consighnment at a local repair shop, and knowbody knew anything about it. It didn't have a power cord, so they made one up for me to see it work. They fan barely moved and the meters didn't light up. I took the top off and stared in amazment at the craftsmanship of the board, the cooling system for the tube, and the fact that the transformer was stamped "220 Mains Only". I had just watched the shop owner hook it to 110! I offered half what they wanted, he made a phone call, and took I it home. Randy, at "The RF Shop" put some caps in the power supply for me, and I've never looked back. I work it at about 500 watts on SSB, and it has never been opened again. Nice and compact, well lit meters, and dependable as the day is long. Great Amp!
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G8MDG
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Rating: 5/5
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May 10, 2004 06:21
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300W CW 144MHz Amplifier
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Time owned: more than 12 months
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It is a smallish professionally designed black box with a discreetly air cooled Eimac 4CX350A running at about 1600VDC at standby 80mA (class AB1 SSB ) and 300mA transmit. The manual claims 1 kilowatt PEP SSB (on "HI" mode) - but then recommends just using 750 W PEP (on "ATT" mode) for keeping the output signal as clean and narrow as an 80 W transistorized amplifier.
I've used the Dressler for years and many QSO's with only once when the 0.8 A 3KV EHT fuse went 'bang' for no apparent reason. I also shipped the amplifier back to Dressler Hochfrequenztecnik gmbh in Stolberg for them to change the chain of 100uF 550V electrolytics when I suspected the cap's of leaking. Perfect service!
The amp features very flexible switching, from "RF-VOX" or "PTT" contact or "Us" (e.g. ICOM) +5 to +15VDC positive switching line. The amp also produces (on RX) +15VDC for powering a mast head pre-amp e.g. Dressler VV200GAAS.
It also can operate with up to 400W out (biased at 0mA class 'B') for FM, but I can't see a need for 400 Watts to access the local repeater - though of course I have tried that occasionally just to check it works!
summing up :
This Dressler Amplifier is a trouble-free, compact, powerful - with robust 4CX350A valve (tube) provided it is not overdriven with more than the recommended 10 to 12 watts of grid drive. But it's nice to know that for short time e.g. MS or EME you can drive it to the full kilowatt PEP for the full (splatter!) experience.
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