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Silver Eagle 200 with 2 Motorola MRF455 Pills

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Silver Eagle 200 with 2 Motorola MRF455 Pills

Post by Smooth Talker » Wednesday, 21 May 2008, 9:25 AM

Anyone had experience with these amps?

How old are they?

I picked one up in trade, and it talks good, but the receive preamp doesn't work.

Low Power Deadkey is @35-37 watts, swings to @175-200 watts, depending on the channel.
High Power Deadkey is @110-125 watts, swings to @225-235 watts, depending on the channel.


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Post by drdx » Wednesday, 21 May 2008, 10:23 AM

If it is the same amp I'm thinking of, that's good power for one of those. I saw them new and bought and sold a few around 1990, and don't know how long they were made. They were not overly expensive when new, about $75 wholesale. -drdx
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Post by slydog » Wednesday, 21 May 2008, 11:34 AM

drdx wrote:If it is the same amp I'm thinking of, that's good power for one of those. I saw them new and bought and sold a few around 1990, and don't know how long they were made. They were not overly expensive when new, about $75 wholesale. -drdx


The most I ever saw one do was 70 swinging to 120 on high.

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Post by Smooth Talker » Wednesday, 21 May 2008, 11:47 AM

The most I ever saw one do was 70 swinging to 120 on high.


What was driving it?

I don't have a liberal meter. I never get the numbers that CB shops tell me, and I have 3 meters.

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Post by drdx » Wednesday, 21 May 2008, 12:20 PM

Seems like they were like a 120 watt am/180 sideband deal, but we all know meters vary, and the pep button does wonders for your equipment satisfaction level. -drdx
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Post by lonesome 500 » Wednesday, 21 May 2008, 12:47 PM

MRF455. . . designed for power amplifier applications
amateur radio equipment to 30 MHz.
• Specified 12.5 Volt, 30 MHz Characteristics —
Output Power = 60 Watts Minimum Gain = 13 dB
Efficiency = 55%
60 W, 30 MHz

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Post by beebuzzbee » Wednesday, 21 May 2008, 15:26 PM

lonesome 500 wrote:MRF455. . . designed for power amplifier applications
amateur radio equipment to 30 MHz.
• Specified 12.5 Volt, 30 MHz Characteristics —
Output Power = 60 Watts Minimum Gain = 13 dB
Efficiency = 55%
60 W, 30 MHz


60w So, with 2 MRF455, does that mean 120w ?

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Post by Smooth Talker » Wednesday, 21 May 2008, 15:39 PM

MRF455. . . designed for power amplifier applications
amateur radio equipment to 30 MHz.
• Specified 12.5 Volt, 30 MHz Characteristics —
Output Power = 60 Watts Minimum Gain = 13 dB
Efficiency = 55%
60 W, 30 MHz


60 Watts each, under laboratory conditions, without a super-modded radio driving it. That's correct. I have the data sheet. I also have the data sheet for the Toshiba 1446 pills, and they are only rated for 70 watts each themselves. I guess that must be class AB power? Perhaps it's also average power?

My 2 pill Class C with 1446's is supposed to do 300 Bird Meter PEP watts, and easily does 350+ PEP watts on my meters.
The 2 pill Class ? with 455's is doing 225-250 PEP on my meters, so I'd guess it would do about 175-200 on a Bird PEP Meter.

Any meter can be used to compare two amplifiers, as long as you realize that the numbers aren't etched in stone.

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Post by Smooth Talker » Wednesday, 21 May 2008, 15:45 PM

I'm getting good reports back on the 2 x 455, under poor conditions here of late. 5-7 pounds of noise on channel 19 yesterday, last night, and today. I'm getting out from 4 to 15 miles in spite of these conditions. Some people just simply can't get back to me past 4 miles, but that's not my fault.

It's not quite the talker that my 2 x 1446 is, but it will talk.

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Post by MAVERICK54 » Wednesday, 21 May 2008, 16:13 PM

I bought one in 1994 saw around 212 watts It was checked by a hobbyist not someone trying to sell. He probably had about 40 years experience in radio.

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silver eagle 350

Post by cowboy 221 » Wednesday, 21 May 2008, 18:07 PM

well, I have a 350 that in south alabama about 14 years ago was a hot setup along with a galaxy 44. when I moved to illinois in 1995 I brought it with me and I took it to a local cb shop. I wanted to check it out and see what it was doing with the 455's (4) that were in it. when we opened it we saw black dots on all the 455's and the tech said hmmm you might not want me to do anything to this and I asked why? he said that the black dots meant they were a matched quad and simply , you just dont mess with them because they are balanced, now here is the part you all can believe or not but he keyed up with four watts with a cobra 25 that swings to about 42 watts and the amp almost hit 750 watts. i told him to put the cover back on and leave it alone. was the meter rigged? was it false? it was a cb shop so you come to your own conclusion but the guy is my friend now(since 1995) , still my tech (and he still does weird crap inside these radios to make them smoke)

just thought I would share

221 got down

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Post by slydog » Wednesday, 21 May 2008, 18:38 PM

Smooth Talker wrote:
The most I ever saw one do was 70 swinging to 120 on high.


What was driving it?

I don't have a liberal meter. I never get the numbers that CB shops tell me, and I have 3 meters.


A Cobra 25 GTL. If you drive a silver eagle 200 hard they might last a month.
A SE-200 doing over 150 watts peak is not going to happen no matter how hard you drive the box.
I would take a Palomar 225, 250 over a Silver Eagle 200 any day of the week.

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Post by slydog » Wednesday, 21 May 2008, 18:40 PM

slydog wrote:
Smooth Talker wrote:
The most I ever saw one do was 70 swinging to 120 on high.


What was driving it?

I don't have a liberal meter. I never get the numbers that CB shops tell me, and I have 3 meters.


A Cobra 25 GTL. If you drive a silver eagle 200 hard they might last a month.
A SE-200 doing over 150 watts peak is not going to happen no matter how hard you drive the box.
I would take a Palomar 225, 250 over a Silver Eagle 200 any day of the week quality wise anyway.

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Post by lonesome 500 » Wednesday, 21 May 2008, 18:58 PM

Smooth Talker wrote:
MRF455. . . designed for power amplifier applications
amateur radio equipment to 30 MHz.
• Specified 12.5 Volt, 30 MHz Characteristics —
Output Power = 60 Watts Minimum Gain = 13 dB
Efficiency = 55%
60 W, 30 MHz


60 Watts each, under laboratory conditions, without a super-modded radio driving it. That's correct. I have the data sheet. I also have the data sheet for the Toshiba 1446 pills, and they are only rated for 70 watts each themselves. I guess that must be class AB power? Perhaps it's also average power?

My 2 pill Class C with 1446's is supposed to do 300 Bird Meter PEP watts, and easily does 350+ PEP watts on my meters.
The 2 pill Class ? with 455's is doing 225-250 PEP on my meters, so I'd guess it would do about 175-200 on a Bird PEP Meter.

Any meter can be used to compare two amplifiers, as long as you realize that the numbers aren't etched in stone.


that is their minimum performance specs at 55 percent efficiency......no ''labratory'' involved...don't know where you got that

that is dissapated watts....with carrier only[before osc]........nothing again to do with ''super duper modulated''

learn the efficiency of classes of your amps....and how they use the transistors.....ab1 vs c = no comparison

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Post by Smooth Talker » Wednesday, 21 May 2008, 19:37 PM

learn the efficiency of classes of your amps....and how they use the transistors.....ab1 vs c = no comparison


I was quoting a post by another person and commenting that those specs aren't reflective of maximum power.

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Post by beebuzzbee » Wednesday, 21 May 2008, 21:15 PM

MAVERICK54 wrote:I bought one in 1994 saw around 212 watts It was checked by a hobbyist not someone trying to sell. He probably had about 40 years experience in radio.


What was the DK set on the radio?

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Post by kg95 » Wednesday, 21 May 2008, 22:13 PM

You can obviously get a lot more out
of an amp by overdriving it.
I mean who would think
a 4 pill needs a 2 pill driver?
It's done in competition all the time.
Who would think a 2 pill needs a driver at all?
One guy around here is smokin
with a 1x2.
You can hear him on 5 channels for miles around!

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RE silver eagle 350

Post by madsage » Friday, 13 June 2008, 12:45 PM

cowboy 221 wrote:well, I have a 350 that in south alabama about 14 years ago was a hot setup along with a galaxy 44. when I moved to illinois in 1995 I brought it with me and I took it to a local cb shop. I wanted to check it out and see what it was doing with the 455's (4) that were in it. when we opened it we saw black dots on all the 455's and the tech said hmmm you might not want me to do anything to this and I asked why? he said that the black dots meant they were a matched quad and simply , you just dont mess with them because they are balanced, now here is the part you all can believe or not but he keyed up with four watts with a cobra 25 that swings to about 42 watts and the amp almost hit 750 watts. i told him to put the cover back on and leave it alone. was the meter rigged? was it false? it was a cb shop so you come to your own conclusion but the guy is my friend now(since 1995) , still my tech (and he still does weird crap inside these radios to make them smoke)



I have a silver eagle 350 with 4x455's black dots also.

It does about 350 watt PEP just as its rated. with 15watts of PEP input.
The amp is great for a radio that does not put out a lot of PEP. it will start pinching up at about 20watt PEP.
Great little amp otherwise. Works well on SSB too. (auto ssb?) Always get great reports.
Also I believe the SD1446 is direct replacement for mrf455 now. Dont quote me on that one however.

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Post by Smooth Talker » Friday, 13 June 2008, 13:41 PM

I sold the amp shortly after I got it. I ran it for a few days and passed it on.

I now have a Fat Boy 1x2879 with variable, and a Fat Boy 2x1446 without variable.

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dk on radio

Post by cowboy 221 » Friday, 13 June 2008, 15:30 PM

3 watts

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Re: Silver Eagle 200 with 2 Motorola MRF455 Pills

Post by BigX » Wednesday, 29 April 2015, 6:59 AM

Just picked one of these up from a guy in my town. Hooked it up on the base station with my Cobra 29 doing 1 watt dead key swinging a little over 15 watts on my ratshack meter. The amp on low dead keys 10 watts and swings 150 to a little less than 200 on that meter. My swrs are perfect btw. Is this what you would expect to get out of this amp? Should I run it on high so it gives me a 50 watt dead key?

I hooked up a different radio with a 4watt dead key and it seems to have too high of a dead key and strained my 19 amp power suply a little with the amp on. I dont want to overdrive it so should I stay away from the 4watt radio?

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Re: Silver Eagle 200 with 2 Motorola MRF455 Pills

Post by southwind » Wednesday, 29 April 2015, 12:08 PM

:bounce: I realize this is an old thread, but I wanted to share my set-up which includes a Silver Eagle 200 with matched 455's. Laying aside all the #'s, with swing etc, I'm running an unmolested Uniden Washington, 4 watts, and a 26 amp ps. When I want to talk to someone, I don't always get through with the traffic, but if I'm persistent, they will finally come through. I take in consideration there is always someone who just doesn't want to talk to you, that's the way it's been for me since the early 60's. These amps were originally made by a man named Ray in Southhaven Miss. Give these little Amps credit, they are an awesome little dude, they have automatic SSB switching, do not overheat, and @ 14.2 watts will whail, not bad for just a 25 yr old Bigstick. I can't imagine what it would do with a set of beams. :cheers:
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Re: Silver Eagle 200 with 2 Motorola MRF455 Pills

Post by BigX » Wednesday, 29 April 2015, 13:08 PM

Nice David. So i guess its ok putting 4 watts into that thing without blowing it? I tried yesterday but didnt want to push it. Do you know what your dead key is with the amp on low?

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Re: Silver Eagle 200 with 2 Motorola MRF455 Pills

Post by MDYoungblood » Wednesday, 29 April 2015, 16:21 PM

You may want to up the amperage a little bit with a bigger PS, 19 amps is right on the edge of being too small for it.

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Re: Silver Eagle 200 with 2 Motorola MRF455 Pills

Post by southwind » Wednesday, 29 April 2015, 17:43 PM

BigX wrote:Nice David. So i guess its ok putting 4 watts into that thing without blowing it? I tried yesterday but didnt want to push it. Do you know what your dead key is with the amp on low?
With the meter I have (R/Shack) and who knows how accurate it is, since I have nothing else to compare, DK is about 65 watts. You might check your power wires for size, I would use either 8 or 10 awg size, and I'm running a 26 amp power supply which is just right. My radio has really good modulation and I never check it for swing, I just get good reports. 3's to you/yours and good evening. :cheers:
AKA Tripple Nickel, DX 555. Base station-Uniden Washington, Philippines made, D-104 Tug 8 , Silver Eagle 200/Pyramid Gold Series Variable 26 amp, through "Old Reliable Shakespeare BigStick"... Mobile-148gtl, Cobra 25, NMO firestik.

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Re: Silver Eagle 200 with 2 Motorola MRF455 Pills

Post by BigX » Thursday, 30 April 2015, 5:28 AM

10 - Roger. Thanks guys. Yeah Im using the Ratshack meter as well and with the amp switched to high the deak key does up to 50-60 wats and swings about the same.


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