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Reviews Categories | Amplifiers: RF Power - HF & HF+6M | Drake L75 Help


Reviews Summary for Drake L75
Drake L75 Reviews: 6 Average rating: 5.0/5 MSRP: $854.95
Description: 160-15 (10 optional) 1-1.2KW PEP Single 3-500z Tuned input 50-60W drive Built in power supply
Product is not in production.
More info: http://www.dproducts.be/Drake_Museum/l-75.htm
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W8IDL Rating: 5/5 Jan 16, 2016 22:14 Send this review to a friend
Solid Performer  Time owned: more than 12 months
I use this amplifier with my Drake TR-5 transceiver and it is a solid performer. I bought it new with the TR-5 and was not sure if I'd be satisfied with a single 3-500z tube, but the L-75 has made me a believer! It is a simple, stable design and puts out 700 watts (+) with its self-contained power supply. Tuning is very smooth and easy and I have had no problems in all these years of ownership. The thing I've noticed is that they are rarely available on the used market, and the ones I see go for more than mine cost new!
 
N3IBX Rating: 5/5 Feb 12, 2009 04:56 Send this review to a friend
One terrific amplifier if you can get your hands on one!  Time owned: more than 12 months
I've owned my L75 for close to ten years now, and other than replacing the original Eimac 3-500Z with a "RF Parts" branded Chinese 3-500ZG, it's been a superb performer. There is a (I think ) 47mfd? padding cap for 160M that you can still get from Drake at about $25 or so. If it becomes defective you'd be better off using a small doorknob or other type cap, and pocket the difference in cost.

I get a solid 900W output with 100W drive on all bands except 10M, where it will do a little less, maybe 800W or so. I modified my amp to run on 10M, since it didn't come with 10M from the factory.

It's perfectly happy on any of the WARC bands, and was built with a wide range pi net output in anticipation of the coming bands when the amp was built.

The L75 has a rugged self contained 2700V power supply, and in my opinion is the very best single 3-500Z amp ever built. It weighs about 70 lbs, and will fit on your operating desk next to your rig/exciter, which in my case is a Drake TR-7 tranceiver. I've also used it with quite a number of different rigs, from a Yaesu FT7-B to a FT-950, and it's performed flawlessly, even on AM. The two speed thermostatically controlled fan kicks in when the tube starts to get real hot, and is relatively quiet in operation. You can hear it just loud enough to let you know it's running on high, but not loud enough to show on your scope.

The only real drawback I can think of is that their relatively scarce. They do turn up on ebay and other sources from time to time, but in my ten years of operating it, I've only encountered one other on the air.

If you're lucky enough to get one, pay just about any price for it. In the long run you won't regret it. For a amp that'll do just under aKW output that fits on your operating desk, and will take a beating, you just can't find a better amp. Period!

GL and thanks for reading my review.

73, Joe Cro N3IBX
 
VE3NYZ Rating: 5/5 Feb 23, 2008 19:59 Send this review to a friend
excellent amplifier  Time owned: 6 to 12 months
An excellent amplifier that produces 600 watts output with as little as 50 watts drive.
Solid reliable construction in a self contained amplifier/power supply combination. Cooling fan is dual stage, running mainly on low speed and runs quietly.
 
IK0YKM Rating: 5/5 Feb 8, 2008 01:11 Send this review to a friend
The best of category  Time owned: 0 to 3 months
Great, reliable amplifier. Easy to use and good power output (700/800 watts) with only 80 watts input.

See it:

http://www.wb4hfn.com/DRAKE/OperatorPictures/IK0YKM-Page02.htm

Is a dream. I'm very satisfied

73's de Henry IK0YKM
 
N5GLR Rating: 5/5 Nov 20, 2006 10:44 Send this review to a friend
Excellent  Time owned: 3 to 6 months
Didn't know what quality was until I acquired this amp. Very smooth in operation. Accurate, easy to tune, consistent, strong, and a real pleasure to use. It's quite handsome too. I like the soft blue glow from the meter light.
I've found that "tuned input", on some amps, is a relative term but, not with the L75 ... perfect on the bands it was built for. Although not designed for WARC, it will work those bands FB with a little help from the internal tuner on my rig. I've found that it's forgiving when faced with a not-so-perfect SWR (book says 2 to 1 is OK and it's true).
50 watts from the exciter will easily produce 600 watts (on 20 mtr) when tuning. On rare occasion, I've "goofed" and driven it with 75 watts (or a bit more) and saw 900 watts on an accurate meter.
Speaking of goofs ... I fried one of the 8 power supply capacitors the day I brought it home. Long explanation cut short ... my fault entirely. I had difficulty finding direct replacement caps so, I found modern electrolytics within the capacitance "range" (same voltage) and replaced all 8. Seems to work FB but, with a bit more plate current.
I feel very comfortable highly recommending this amp to anyone who can find/afford one. They are fairly rare (not many were built) and value is increasing. I recently saw one listed as "new" on ebay and the bid was around $2k ... also saw another one listed elsewhere for around $1200. I think I got lucky when I found this one for far less than that.

Garry
N5GLR
 
VR2AX Rating: 5/5 Aug 17, 2005 23:28 Send this review to a friend
Reliable medium power classic  Time owned: more than 12 months
Reliable 1980 Drake amplifier, younger brother of the L 7 with power supply built in) still produces 600 watts key down out measured on a Bird 43. It can produce more however I limit plate current to 400 mA not 450 mA as stated in the manual. Keep grid current to 120 mA. Amp is even quieter than my L4 and L-4B. Consider installing a soft start to limit filament inrush current if used regularly.
Perspex/plexiglass/Lexan strip over meters tends to deteriorate but can be replaced easily.
 


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