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Silver Streak 150 compatability/148gtl

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Silver Streak 150 compatability/148gtl

Post by stronghands » Tuesday, 16 November 2010, 10:28 AM

Hi Guys,
I'm new to this forum and was hoping to pick your brains on a set-up I have been thinking of useing. I have a cobra148gtl that deadkeys at 2 watts and swings up to about 30 watts with a modulation kit. It also has the newer "mosfitt " finals, and has been peaked and tuned. the radio talks well and I am happy with it.
I just picked up a brand new unused silver-streak 150 amp and was wondering how well it will work with my 148gtl? Does my radio have to much input power for this amp? Does anyone have any instructions or a technical manuel for this amp? It is brand new, but did not come with any paper work.(craigs list speical).
Any help that the experts on this forum is and will be greatly apreciated!
Thanks, Stronghands.


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Re: Silver Streak 150 compatability/148gtl

Post by Radio 75 » Tuesday, 16 November 2010, 10:42 AM

Did a little research on that amp. It has a pair of MRF 454 transistors, so the output should be right at 120 watts.
Make sure your SWR is good, connect a good wattmeter on the output of the amp and talk in your normal tone of voice.
If the output is more than say, 130 watts on voice peaks, you will need to "swamp" the input with resistors to lower the amount of power input to the amp. Or, turn your radio down a bit.

The main point being, if you run too much input into that amp, it will let all the magic smoke out of the transistors.
They are currently about $90 for a matched pair.
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Re: Silver Streak 150 compatability/148gtl

Post by stronghands » Tuesday, 16 November 2010, 10:49 AM

Thanks Radio75, all the info I can get is much apreciated! I've read that this amp will work well on am, but not so well on ssb. I believe it is a class c amp. Can you elaborate on this for me?

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Re: Silver Streak 150 compatability/148gtl

Post by Radio 75 » Tuesday, 16 November 2010, 10:58 AM

From what I read, it is a class C amp. Basically this means that it will not be linear on sideband, resulting in harmonic outputs, distortion, and generally sounding very "scratchy" and it just gets worse the more you drive it.
You really need an amp biased as class B, or even better, AB for SSB use. Class B and AB amps with the same transistors as a class C amp will have less output, but will actually be linear, and sound OH so much better.

I hope that answered your question, if not let me know. (I love to talk about radio as much as I love to talk ON the radio) :biggrin:
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Re: Silver Streak 150 compatability/148gtl

Post by stronghands » Tuesday, 16 November 2010, 11:16 AM

Thanks again Radio75,
I purchased this little amp for $75., figured I wouldn't get hurt to bad! I really like it's compact size. Maybee I'll just use it on AM as I really don't use the SSB that much any ways. If it proves to be too much trouble I'll just resell it. Do you know where I might find a manuel for it?


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Re: Silver Streak 150 compatability/148gtl

Post by preacherman » Tuesday, 16 November 2010, 13:29 PM

I've run the little Silver Streaks in that past. It's a nice little Class C amp.
As long as you turn down your mic gain on ssb, it really doesn't sound too bad.
It's not as linear as a Class B or AB amp, but it's certainly good enough to use
for casual ssb work.
Have fun!
Preacherman
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Re: Silver Streak 150 compatability/148gtl

Post by stronghands » Tuesday, 16 November 2010, 16:00 PM

Hey thanks for the vote of confidence Preacherman. I am looking foreward to playing with this cool little amp, maybee not as big or powerful as others but I think it will be great for my purposes.
Stronghands.

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Re: Silver Streak 150 compatability/148gtl

Post by tractor guy » Tuesday, 16 November 2010, 17:53 PM

I have a Hooker 100 amp that uses 2 of teh MRF 454's. Is there an easy way to test them. I think I may have let the smoke out. While testing it a couple weeks ago it made a "pop" and now shows no output. Any suggestions on what I may have fumped up?

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Re: Silver Streak 150 compatability/148gtl

Post by preacherman » Tuesday, 16 November 2010, 18:38 PM

Look for blown caps...they are more likely to make a noise when failing
than a pill. If you find blown 10 ohm resistors beside the pills, then the
likelihood the pills are now dead soldiers is high.
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Re: Silver Streak 150 compatability/148gtl

Post by tractor guy » Tuesday, 16 November 2010, 20:13 PM

I shamelessly stole the image from another thread, but the layout looks the same. THe outer covering on the doodad I circled looks like it is coming off at the one end. If this is what popped, would it cause physical damage that I could see.

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Thanks
Joe

P.S. mine has one more switch for PEP or RMS output. What do I need to be running this thing on for AM?
1953 Tractor Guy
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Re: Silver Streak 150 compatability/148gtl

Post by Radio 75 » Tuesday, 16 November 2010, 20:51 PM

That looks like what once was an electrolytic capacitor.
The other device that is the same size and shape closer to the front panel should be about the same value.
Of course, without a schematic I am just guessing here. If in doubt, look at the value of the good cap and
add about 20% on both voltage and capacitance.

AM=RMS
SSB=PEP

My advice is worth what it cost you, and make sure when you solder in the new cap that you pay attention to the polarity or
you will have another mess to clean up. :)
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Re: Silver Streak 150 compatability/148gtl

Post by tractor guy » Tuesday, 16 November 2010, 21:01 PM

the numbers are mostly readable, so I think I can figure out what I need. Plus I have two of them. This one and one that still works, so if I have to I can pop the lid on the good one and get it from there.

Thanks again.

Joe
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Re: Silver Streak 150 compatability/148gtl

Post by tractor guy » Wednesday, 17 November 2010, 11:31 AM

The old one is a 25v 47uF. I found a 35v 47uF. Is that gonna be close enough?

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Re: Silver Streak 150 compatability/148gtl

Post by stronghands » Wednesday, 17 November 2010, 11:50 AM

Hey one last question on my "new" silver streak 150, There are 4 togle switches on the front (and LED'S)... A High/Low switch, A SSB/AM switch, A ON/RCV switch, and finally A ON/POWER switch. my question is the switch marked "RCV" a amplifer for incoming signals? Sorry about the bone-head questions, just trying to get a handle on how to use some of this equipment.
Thanks, Stronghands

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Re: Silver Streak 150 compatability/148gtl

Post by Radio 75 » Wednesday, 17 November 2010, 12:49 PM

tractor guy wrote:The old one is a 25v 47uF. I found a 35v 47uF. Is that gonna be close enough?

Thanks
Joe
You betcha! It's always OK to go higher in voltage value. Going lower is where you run into problems.
(speaking of electrolytic capacitors in power circuits)
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Re: Silver Streak 150 compatability/148gtl

Post by Radio 75 » Wednesday, 17 November 2010, 12:51 PM

stronghands wrote:Hey one last question on my "new" silver streak 150, There are 4 togle switches on the front (and LED'S)... A High/Low switch, A SSB/AM switch, A ON/RCV switch, and finally A ON/POWER switch. my question is the switch marked "RCV" a amplifer for incoming signals? Sorry about the bone-head questions, just trying to get a handle on how to use some of this equipment.
Thanks, Stronghands
They are not bone-head questions!
Yup, that is for a receive pre-amp. On some amps, you can use the receive pre-amp without turning the amp on.
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Re: Silver Streak 150 compatability/148gtl

Post by stronghands » Wednesday, 17 November 2010, 14:26 PM

Thanks Radio75, I believe you can with this one as well, I'm a little excited about hooking this little amp up! You were right about the 455 transistors/pills? also, I looked under the hood! The guts all look real clean, I don't really understand what anything does in there, but as long as the "magic smoke" stays where it's supposed to, I'll be fine!
Thanks,Stronghands.


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